DOC AIRBUS | AMM A320FCheck of the Internal Leakage of the Yellow Hydraulic System
TASK 29-00-00-280-003-A
Check of the Internal Leakage of the Yellow Hydraulic System
To make sure that the internal leakage of the system and parts of the system are in limits.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 29-00-00-010-053-A ** ON A/C NOT FOR ALL Subtask 29-00-00-010-053-B ** ON A/C NOT FOR ALL
Subtask 29-00-00-280-061-B ** ON A/C NOT FOR ALL
Subtask 29-00-00-860-057-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 00:13:30 UTC
Check of the Internal Leakage of the Yellow Hydraulic System
WARNING:
MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
1. Reason for the JobTo make sure that the internal leakage of the system and parts of the system are in limits.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | FLOWMETER 20.00 L.MN (5.2833 US GAL.MN) |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| 610007AB | 1 | TOOL-MEASURE,HYDRAULIC FLOW |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 196BB, 198CB |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 29-10-00-863-002-A | Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart |
| TASK 29-10-00-864-002-A | Depressurize the Yellow Hydraulic System |
| TASK 29-23-00-860-001-A | Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| TASK 29-23-00-860-002-A | Connection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| TASK 29-24-00-863-001-A | Pressurize the Yellow Hydraulic System with the Electric Pump |
| TASK 29-24-00-863-001-A | Pressurize the Yellow Hydraulic System with the Electric Pump |
| TASK 29-24-00-864-001-A | Depressurize the Yellow Hydraulic System |
| TASK 31-60-00-860-001-A | EIS Start Procedure |
| TASK 31-60-00-860-002-A | EIS Stop Procedure |
Subtask 29-00-00-010-053-A ** ON A/C NOT FOR ALL Subtask 29-00-00-010-053-B ** ON A/C NOT FOR ALL
A. Get Access
(1) Open the access door 196BB.
(2) If an ultrasonic flow meter is not used in procedure that follows, open access door 198CB.
Subtask 29-00-00-865-052-A (1) Open the access door 196BB.
(2) If an ultrasonic flow meter is not used in procedure that follows, open access door 198CB.
B. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 29-00-00-865-055-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/ELAC1/NORM/SPLY | 15CE1 | B11 |
| 49VU | FLIGHT CONTROLS/SEC1/NORM/SPLY | 21CE1 | B08 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/ELAC1/NORM/SPLY | 15CE1 | B06 |
| 49VU | FLIGHT CONTROLS/SEC1/NORM/SPLY | 21CE1 | B03 |
| ** ON A/C ALL | |||
| 105VU | FLIGHT CONTROLS/ELAC2/STBY SPLY | 16CE2 | A02 |
| 105VU | FLT CTL/ELAC1/STBY SPLY | 16CE1 | A01 |
| 105VU | FLT CTL/SEC1/STBY SPLY | 22CE | B01 |
| 121VU | AUTO FLT/FAC2/28VDC | 5CC2 | M19 |
| 121VU | AUTO FLT/FAC2/26VAC | 14CC2 | M18 |
| 121VU | HYDRAULIC/SOL VALVES/G/Y/B/LEAK/TST | 1881GP | N35 |
| 121VU | HYDRAULIC/SOL VALVES/G/Y/PTU | 1801GL | N34 |
| 121VU | FLIGHT CONTROLS/SEC3/SPLY | 21CE3 | Q19 |
| 121VU | FLIGHT CONTROLS/SEC2/SPLY | 21CE2 | Q18 |
| 121VU | FLIGHT CONTROLS/ELAC2/NORM/SPLY | 15CE2 | R20 |
C. Open, safety and tag this(these) circuit breaker(s):
Subtask 29-00-00-860-056-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N30 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N31 |
| ** ON A/C ALL | |||
| 123VU | Y HYD/ELEC/PUMP | 3802GX | AB06 |
| 123VU | Y HYD/ELEC/ELEC PUMP/NORM | 3801GX | AB03 |
D. Aircraft Maintenance Configuration
(1) Connect a ground service cart with a FLOWMETER 20.00 L.MN (5.2833 US GAL.MN), calibrated to +/- 1.5% over full range to the ground test connections of the Yellow hydraulic system.
(2) In the main landing gear compartment, disconnect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-001).
(3) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(4) Set the ECAM system to on (Ref. AMM TASK 31-60-00-860-001).
(5) On the ECAM control panel on the center pedestal, push the F/CTL pushbutton (P/B). Make sure the lower display unit (DU) shows the F/CTL page.
(6) Pressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-863-002).
(7) On the overhead panel 23VU, make sure that the ELAC 1 and SEC 1 pushbutton switches P/BSW are set to on (OFF and FAULT lights not on).
(8) On the overhead panel 24VU, make sure that the ELAC 2, SEC 2, SEC 3 and FAC 2 P/BSW are set to on (OFF and FAULT lights not on).
(9) On the overhead panel 40VU set the PTU P/BSW to OFF (the OFF light comes on).
(11) Keep all of the control surfaces stopped in the 0 deg (retracted) position during measurement of internal leakage.
Subtask 29-00-00-860-056-B ** ON A/C NOT FOR ALL (1) Connect a ground service cart with a FLOWMETER 20.00 L.MN (5.2833 US GAL.MN), calibrated to +/- 1.5% over full range to the ground test connections of the Yellow hydraulic system.
(2) In the main landing gear compartment, disconnect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-001).
(3) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(4) Set the ECAM system to on (Ref. AMM TASK 31-60-00-860-001).
(5) On the ECAM control panel on the center pedestal, push the F/CTL pushbutton (P/B). Make sure the lower display unit (DU) shows the F/CTL page.
(6) Pressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-863-002).
(7) On the overhead panel 23VU, make sure that the ELAC 1 and SEC 1 pushbutton switches P/BSW are set to on (OFF and FAULT lights not on).
(8) On the overhead panel 24VU, make sure that the ELAC 2, SEC 2, SEC 3 and FAC 2 P/BSW are set to on (OFF and FAULT lights not on).
(9) On the overhead panel 40VU set the PTU P/BSW to OFF (the OFF light comes on).
WARNING:
MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(10) Operate the sidestick and rudder pedals to put the control surfaces associated with the Yellow hydraulic system in the 0 deg position (spoilers retracted). (11) Keep all of the control surfaces stopped in the 0 deg (retracted) position during measurement of internal leakage.
NOTE: Do the checks of internal leakage with the hydraulic fluid at its usual working temperature of between 20 deg.C (68.00 deg.F) and 60 deg.C (140.00 deg.F).
D. Aircraft Maintenance Configuration
(1) If an ultrasonic flow meter is used in the procedure that follows:
(a) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(b) In the main landing gear compartment, disconnect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-001).
(c) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(d) On the ECAM control panel on the center pedestal, push the F/CTL pushbutton (P/B). Make sure the lower display unit (DU) shows the F/CTL page.
(e) Pressurize the Yellow hydraulic system
(Ref. AMM TASK 29-24-00-863-001).
(2) If an ultrasonic flow meter is not used in the procedure that follows:
(a) Connect a ground service cart with a FLOWMETER 20.00 L.MN (5.2833 US GAL.MN), calibrated to +/- 1.5% over full range to the ground test connections of the Yellow hydraulic system.
(b) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(c) In the main landing gear compartment, disconnect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-001).
(d) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(e) On the ECAM control panel on the center pedestal, push the F/CTL pushbutton (P/B). Make sure the lower display unit (DU) shows the F/CTL page.
(f) Pressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-863-002).
(3) On the overhead panel 23VU, make sure that the ELAC 1 and SEC 1 pushbutton switches P/BSW are set to ON (the OFF and FAULT lights are off).
(4) On the overhead panel 24VU, make sure that the ELAC 2, SEC 2, SEC 3 and FAC 2 P/BSW are set to ON (the OFF and FAULT lights are off).
(5) On the overhead panel 40VU set the PTU P/BSW to OFF (the OFF light comes on).
(7) Keep all of the control surfaces stopped in the 0 deg (retracted) position during measurement of internal leakage.
4. Procedure(1) If an ultrasonic flow meter is used in the procedure that follows:
(a) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(b) In the main landing gear compartment, disconnect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-001).
(c) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(d) On the ECAM control panel on the center pedestal, push the F/CTL pushbutton (P/B). Make sure the lower display unit (DU) shows the F/CTL page.
(e) Pressurize the Yellow hydraulic system
(Ref. AMM TASK 29-24-00-863-001).
(2) If an ultrasonic flow meter is not used in the procedure that follows:
(a) Connect a ground service cart with a FLOWMETER 20.00 L.MN (5.2833 US GAL.MN), calibrated to +/- 1.5% over full range to the ground test connections of the Yellow hydraulic system.
(b) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(c) In the main landing gear compartment, disconnect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-001).
(d) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(e) On the ECAM control panel on the center pedestal, push the F/CTL pushbutton (P/B). Make sure the lower display unit (DU) shows the F/CTL page.
(f) Pressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-863-002).
(3) On the overhead panel 23VU, make sure that the ELAC 1 and SEC 1 pushbutton switches P/BSW are set to ON (the OFF and FAULT lights are off).
(4) On the overhead panel 24VU, make sure that the ELAC 2, SEC 2, SEC 3 and FAC 2 P/BSW are set to ON (the OFF and FAULT lights are off).
(5) On the overhead panel 40VU set the PTU P/BSW to OFF (the OFF light comes on).
WARNING:
MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(6) Operate the sidestick and rudder pedals to put the control surfaces in the 0 deg position (spoilers retracted). (7) Keep all of the control surfaces stopped in the 0 deg (retracted) position during measurement of internal leakage.
NOTE: Do the checks of internal leakage with the hydraulic fluid at its usual working temperature of between 20 deg.C (68.00 deg.F) and 60 deg.C (140.00 deg.F).
Subtask 29-00-00-280-061-B ** ON A/C NOT FOR ALL
A. Check of the Internal Leakage of the Yellow Hydraulic System
(1) Measurement of the Yellow system (complete) internal leakage
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/Y P/BSW is set to on (OFF light not on).
(b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) Monitor the flow shown on the ground supply flowmeter. It must not be more than 10.0 l.min (2.6417 USgal.mn).
(d) If the internal leakage is too much, do the checks of sections of the system to find the cause.
(2) Measurement of the Yellow system (central section) internal leakage
Yellow Hydraulic System - Central Section ** ON A/C NOT FOR ALL
Yellow Hydraulic System - Central Section ** ON A/C NOT FOR ALL
(a) On the ECAM control panel on the center pedestal, push the HYD P/B. Make sure that the lower DU shows the HYD page.
(b) On the overhead maintenance panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/Y P/BSW to off (the OFF light comes on).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the lower DU to make sure that the solenoid valve operation is correct (the color of the flow arrow and system name of the Yellow system is amber).
(e) In the Yellow system compartment, make sure that the three valves on the leakage measurement selector valve are set to OFF.
(f) Monitor the flow shown on the ground supply flow meter. It must not be more than 2.9 l.min (0.7661 USgal.mn).
(3) Measurement of the Yellow system (rear section) internal leakage
Yellow Hydraulic System - Rear Section ** ON A/C NOT FOR ALL
Yellow Hydraulic System - Rear Section ** ON A/C NOT FOR ALL
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/Y P/BSW is set to off (OFF light is on).
(b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) In the Yellow system compartment, turn the REAR manual selector valve to the ON position.
(d) Monitor the flow shown on the ground supply flowmeter. It must not be more than 8.7 l.min (2.2983 USgal.mn).
(e) In the Yellow system compartment, turn the REAR manual selector to the OFF position.
(4) Measurement of the Yellow system (left wing section) internal leakage
Yellow Hydraulic System - Left Wing Section ** ON A/C NOT FOR ALL
Yellow Hydraulic System - Left Wing Section ** ON A/C NOT FOR ALL
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/Y P/BSW is set to off (the OFF light is on).
(b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) In the Yellow system compartment, turn the LH WING manual selector valve to the ON position.
(d) Monitor the flow shown on the ground supply flowmeter. It must not be more than 4.9 l.min (1.2944 USgal.mn).
(e) In the Yellow system compartment, turn the LH WING manual selector valve to the OFF position.
(5) Measurement of the Yellow system (right wing section) internal leakage
Yellow Hydraulic System - Right Wing Section ** ON A/C NOT FOR ALL
Yellow Hydraulic System - Right Wing Section ** ON A/C NOT FOR ALL
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/Y P/BSW is set to off (the OFF light is on).
(b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) In the Yellow system compartment, turn the RH WING manual selector valve to the ON position.
(d) Monitor the flow shown on the ground supply flowmeter. It must not be more than 4.9 l.min (1.2944 USgal.mn).
(e) In the Yellow system compartment, turn the RH WING manual selector valve to the OFF position.
(6) Permitted leakage rates for the components
(a) The maximum permitted internal leakage for components related to the Yellow hydraulic system is;
Spoiler 4: 1.5 l.min (0.3963 USgal.mn)
Spoiler 2: 0.8 l.min (0.2113 USgal.mn)
THS actuator servovalve: 0.75 l.min (0.1981 USgal.mn)
Elevator servocontrol: 1.5 l.min (0.3963 USgal.mn)
Rudder servocontrol: 2.1 l.min (0.5548 USgal.mn)
Yaw damper actuator: 1.3 l.min (0.3434 USgal.mn)
Flap PCU valve block: 0.2 l.min (0.0528 USgal.mn)
1 Listen to the pipes and components which may be the cause.
2 Feel the pipes and components, a high leakage rate will cause an increase in their temperature.
Subtask 29-00-00-280-061-C ** ON A/C NOT FOR ALL (1) Measurement of the Yellow system (complete) internal leakage
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/Y P/BSW is set to on (OFF light not on).
(b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) Monitor the flow shown on the ground supply flowmeter. It must not be more than 10.0 l.min (2.6417 USgal.mn).
(d) If the internal leakage is too much, do the checks of sections of the system to find the cause.
(2) Measurement of the Yellow system (central section) internal leakage
Yellow Hydraulic System - Central Section ** ON A/C NOT FOR ALL Yellow Hydraulic System - Central Section ** ON A/C NOT FOR ALL (b) On the overhead maintenance panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/Y P/BSW to off (the OFF light comes on).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the lower DU to make sure that the solenoid valve operation is correct (the color of the flow arrow and system name of the Yellow system is amber).
(e) In the Yellow system compartment, make sure that the three valves on the leakage measurement selector valve are set to OFF.
(f) Monitor the flow shown on the ground supply flow meter. It must not be more than 2.9 l.min (0.7661 USgal.mn).
(3) Measurement of the Yellow system (rear section) internal leakage
Yellow Hydraulic System - Rear Section ** ON A/C NOT FOR ALL Yellow Hydraulic System - Rear Section ** ON A/C NOT FOR ALL (b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) In the Yellow system compartment, turn the REAR manual selector valve to the ON position.
(d) Monitor the flow shown on the ground supply flowmeter. It must not be more than 8.7 l.min (2.2983 USgal.mn).
(e) In the Yellow system compartment, turn the REAR manual selector to the OFF position.
(4) Measurement of the Yellow system (left wing section) internal leakage
Yellow Hydraulic System - Left Wing Section ** ON A/C NOT FOR ALL Yellow Hydraulic System - Left Wing Section ** ON A/C NOT FOR ALL (b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) In the Yellow system compartment, turn the LH WING manual selector valve to the ON position.
(d) Monitor the flow shown on the ground supply flowmeter. It must not be more than 4.9 l.min (1.2944 USgal.mn).
(e) In the Yellow system compartment, turn the LH WING manual selector valve to the OFF position.
(5) Measurement of the Yellow system (right wing section) internal leakage
Yellow Hydraulic System - Right Wing Section ** ON A/C NOT FOR ALL Yellow Hydraulic System - Right Wing Section ** ON A/C NOT FOR ALL (b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) In the Yellow system compartment, turn the RH WING manual selector valve to the ON position.
(d) Monitor the flow shown on the ground supply flowmeter. It must not be more than 4.9 l.min (1.2944 USgal.mn).
(e) In the Yellow system compartment, turn the RH WING manual selector valve to the OFF position.
(6) Permitted leakage rates for the components
(a) The maximum permitted internal leakage for components related to the Yellow hydraulic system is;
Spoiler 4: 1.5 l.min (0.3963 USgal.mn)
Spoiler 2: 0.8 l.min (0.2113 USgal.mn)
THS actuator servovalve: 0.75 l.min (0.1981 USgal.mn)
Elevator servocontrol: 1.5 l.min (0.3963 USgal.mn)
Rudder servocontrol: 2.1 l.min (0.5548 USgal.mn)
Yaw damper actuator: 1.3 l.min (0.3434 USgal.mn)
Flap PCU valve block: 0.2 l.min (0.0528 USgal.mn)
NOTE: The maximum leakage rates for components are given only to assist in trouble shooting. The total leakage of components in a section (left wing, right wing, etc) of the system must be less than the permitted maximum for that section. Also the total leakages of the sections must not together be more than the leakage permitted for the complete system.
(b) If the internal leakage rate is too high you can find the defective component if you: 1 Listen to the pipes and components which may be the cause.
2 Feel the pipes and components, a high leakage rate will cause an increase in their temperature.
CAUTION:
DO NOT DISCONNECT AND CAP THE RETURN LINE FROM A SERVOCONTROL TO DO A LEAKAGE CHECK. IF A SUPPLY OF SYSTEM PRESSURE GETS TO THE SERVOCONTROL IT CAN CAUSE DAMAGE IF THERE IS NO RETURN FLOW.
(c) If you think that a servocontrol is the cause, disconnect and cap the supply to the servocontrol. Do the test again and if the leakage rate is now in limits,the servocontrol is confirmed as defective. A. Check of the Internal Leakage of the Yellow Hydraulic System
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASURMENT VALVES/Y P/BSW is set to on (OFF light not on).
(b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) Monitor the flow shown on the ground supply flowmeter. It must not be more than 10.0 l.min (2.6417 USgal.mn).
(d) If the internal leakage is too much:
1 Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-864-002).
2 Disconnect the ground hydraulic supply from the aircraft ground test connections.
3 Pressurize the Yellow hydraulic system
with the electric pump (Ref. AMM TASK 29-24-00-863-001).
4 Do the leakage check of all sections of the Yellow hydraulic system to find the cause of high leakage.
(2) Measure the Yellow hydraulic system (central section) internal leakage with an ultrasonic flow meter:
(a) On the ECAM control panel on the center pedestal, push the HYD P/B. Make sure that the lower DU shows the HYD page.
(b) On the overhead maintenance panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/G P/BSW to OFF (the OFF light is on).
(c) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the color of the flow arrow and system name of the Yellow system is amber).
(d) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(e) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(f) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(g) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use detergent to clean the leakage transducer (5).
(h) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(i) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(j) Connect the leakage transducer cable (8) to the transmitter (9).
(k) Refer to the ground instruction manual of the ultrasonic flow meter to set:
(m) Monitor the flow on the ultrasonic flow meter display. It must not be more than 2.9 l.min (0.76 USgal.mn).
(n) If the internal leakage is more than 2.9 l.min (0.76 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(o) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(p) Disconnect the leakage transducer cable (8) from the transmitter (9).
(3) Measure the Yellow hydraulic system (complete section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 7.3 l.min (1.92 USgal.mn).
(m) If the internal leakage is more than 7.3 l.min (1.92 USgal.mn) do the measurements that follow to find the cause of the high internal leakage:
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(4) Measure of the Yellow hydraulic system (rear section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 6.0 l.min (1.58 USgal.mn).
(m) If the internal leakage is more than 6.0 l.min (1.58 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(5) Measure the Yellow hydraulic system (left wing section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remainig acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 First guide the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 2.2 l.min (0.58 USgal.mn).
(m) If the internal leakage is more than 2.2 l.min (0.58 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(6) Measure of the Yellow hydraulic system (right wing section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) with the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 2.2 l.min (0.58 USgal.mn).
(m) If the internal leakage is more than 2.2 l.min (0.58 USgal.mn) do the steps in Para A.(7) to find the cause (s) of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(7) Permitted leakage rates of the components and how to find the defective component
(a) The maximum permitted internal leakage for components related to the Yellow hydraulic system is:
Spoiler 4: 1.5 l.min (0.39 USgal.mn)
Spoiler 2: 0.8 l.min (0.21 USgal.mn)
THS actuator servovalve: 0.75 l.min (0.19 USgal.mn)
Elevator servocontrol: 1.5 l.min (0.39 USgal.mn)
Rudder servocontrol: 2.1 l.min (0.55 USgal.mn)
Yaw damper actuator: 1.3 l.min (0.34 USgal.mn)
Flap PCU valve block: 0.2 l.min (0.05 USgal.mn)
1 Listen to the pipes and components which can be the cause.
2 Touch the pipes and components, a high leakage rate will cause an increase in their temperature.
Subtask 29-00-00-280-061-D ** ON A/C NOT FOR ALL NOTE: You can do this test with or without an ultrasonic flow meter. If the internal leakage is out of limits then ultrasonic flow meter must be used to prevent an aircraft-on-ground (AOG) condition.
(1) Measure the internal leakage of the Yellow hydraulic system (complete) without an ultrasonic flow meter: (a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASURMENT VALVES/Y P/BSW is set to on (OFF light not on).
(b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) Monitor the flow shown on the ground supply flowmeter. It must not be more than 10.0 l.min (2.6417 USgal.mn).
(d) If the internal leakage is too much:
1 Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-864-002).
2 Disconnect the ground hydraulic supply from the aircraft ground test connections.
3 Pressurize the Yellow hydraulic system
with the electric pump (Ref. AMM TASK 29-24-00-863-001).
4 Do the leakage check of all sections of the Yellow hydraulic system to find the cause of high leakage.
(2) Measure the Yellow hydraulic system (central section) internal leakage with an ultrasonic flow meter:
(a) On the ECAM control panel on the center pedestal, push the HYD P/B. Make sure that the lower DU shows the HYD page.
(b) On the overhead maintenance panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/G P/BSW to OFF (the OFF light is on).
(c) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the color of the flow arrow and system name of the Yellow system is amber).
(d) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(e) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(f) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(g) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use detergent to clean the leakage transducer (5).
(h) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(i) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(j) Connect the leakage transducer cable (8) to the transmitter (9).
(k) Refer to the ground instruction manual of the ultrasonic flow meter to set:
- The serial number of the airplane
- The input location code on the ultrasonic flow meter to numeric code: 52690909 (Yellow central section).
(m) Monitor the flow on the ultrasonic flow meter display. It must not be more than 2.9 l.min (0.76 USgal.mn).
(n) If the internal leakage is more than 2.9 l.min (0.76 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(o) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(p) Disconnect the leakage transducer cable (8) from the transmitter (9).
(3) Measure the Yellow hydraulic system (complete section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
- The serial number of the airplane
- The input location code on the ultrasonic flow meter to numeric code: 66558384 (Yellow complete section).
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 7.3 l.min (1.92 USgal.mn).
(m) If the internal leakage is more than 7.3 l.min (1.92 USgal.mn) do the measurements that follow to find the cause of the high internal leakage:
- Measure of the internal leakage of the rear section of the Yellow hydraulic system Para A.(4)
- Measure the internal leakage of the left wing section of the Yellow hydraulic system Para A.(5)
- Measure the internal leakage of the right wing section of the Yellow hydraulic system Para A.(6).
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(4) Measure of the Yellow hydraulic system (rear section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
- The serial number of the airplane
- The input location code on the ultrasonic flow meter to numeric code: 98512388 (Yellow rear section).
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 6.0 l.min (1.58 USgal.mn).
(m) If the internal leakage is more than 6.0 l.min (1.58 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(5) Measure the Yellow hydraulic system (left wing section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remainig acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 First guide the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
- The serial number of the airplane
- The input location code on the ultrasonic flow meter to numeric code: 24561421 (Yellow left wing section).
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 2.2 l.min (0.58 USgal.mn).
(m) If the internal leakage is more than 2.2 l.min (0.58 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(6) Measure of the Yellow hydraulic system (right wing section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) with the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
- The serial number of the airplane
- The input location code on the ultrasonic flow meter to numeric code: 23574435 (Yellow right wing section).
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 2.2 l.min (0.58 USgal.mn).
(m) If the internal leakage is more than 2.2 l.min (0.58 USgal.mn) do the steps in Para A.(7) to find the cause (s) of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(7) Permitted leakage rates of the components and how to find the defective component
(a) The maximum permitted internal leakage for components related to the Yellow hydraulic system is:
Spoiler 4: 1.5 l.min (0.39 USgal.mn)
Spoiler 2: 0.8 l.min (0.21 USgal.mn)
THS actuator servovalve: 0.75 l.min (0.19 USgal.mn)
Elevator servocontrol: 1.5 l.min (0.39 USgal.mn)
Rudder servocontrol: 2.1 l.min (0.55 USgal.mn)
Yaw damper actuator: 1.3 l.min (0.34 USgal.mn)
Flap PCU valve block: 0.2 l.min (0.05 USgal.mn)
NOTE: The maximum leakage rates for components are given only to assist in trouble shooting. The total leakage of components in a section (left wing, right wing etc) of the system must be less than the leakage permitted for that section. Also, the sum of all leakages of all the sections must not be more than the leakage permitted for the full system.
(b) If the internal leakage rate is too high you can find the defective component if you: 1 Listen to the pipes and components which can be the cause.
2 Touch the pipes and components, a high leakage rate will cause an increase in their temperature.
CAUTION:
DO NOT DISCONNECT AND CAP THE RETURN LINE FROM A SERVOCONTROL TO DO A LEAKAGE CHECK. IF A SUPPLY OF SYSTEM PRESSURE GETS TO THE SERVOCONTROL IT CAN CAUSE DAMAGE IF THERE IS NO RETURN FLOW.
(c) If you think that a servocontrol is the cause, disconnect and cap the supply to the servocontrol. Do the test again and if the leakage rate is in limits, the servocontrol is the defective component. A. Check of the Internal Leakage of the Yellow Hydraulic System
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASURMENT VALVES/Y P/BSW is set to on (OFF light not on).
(b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) Monitor the flow shown on the ground supply flowmeter. It must not be more than 7.2 l.min (1.90 USgal.mn).
(d) If the internal leakage is too much:
1 Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-864-002).
2 Disconnect the ground hydraulic supply from the aircraft ground test connections.
3 Pressurize the Yellow hydraulic system
with the electric pump (Ref. AMM TASK 29-24-00-863-001).
4 Do the leakage check of all sections of the Yellow hydraulic system to find the cause of high leakage.
(2) Measure the Yellow hydraulic system (central section) internal leakage with an ultrasonic flow meter:
(a) On the ECAM control panel on the center pedestal, push the HYD P/B. Make sure that the lower DU shows the HYD page.
(b) On the overhead maintenance panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/G P/BSW to OFF (the OFF light is on).
(c) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the color of the flow arrow and system name of the Yellow system is amber).
(d) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(e) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(f) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(g) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use detergent to clean the leakage transducer (5).
(h) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(i) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(j) Connect the leakage transducer cable (8) to the transmitter (9).
(k) Refer to the ground instruction manual of the ultrasonic flow meter to set:
(m) Monitor the flow on the ultrasonic flow meter display. It must not be more than 2.0 l.min (0.53 USgal.mn).
(n) If the internal leakage is more than 2.0 l.min (0.53 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(o) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(p) Disconnect the leakage transducer cable (8) from the transmitter (9).
(3) Measure the Yellow hydraulic system (complete section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 5.3 l.min (1.40 USgal.mn).
(m) If the internal leakage is more than 5.3 l.min (1.40 USgal.mn) do the measurements that follow to find the cause of the high internal leakage:
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(4) Measure of the Yellow hydraulic system (rear section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 4.3 l.min (1.14 USgal.mn).
(m) If the internal leakage is more than 4.3 l.min (1.14 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(5) Measure the Yellow hydraulic system (left wing section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remainig acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 First guide the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 1.6 l.min (0.42 USgal.mn).
(m) If the internal leakage is more than 1.6 l.min (0.42 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(6) Measure of the Yellow hydraulic system (right wing section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) with the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 1.6 l.min (0.42 USgal.mn).
(m) If the internal leakage is more than 1.6 l.min (0.42 USgal.mn) do the steps in Para A.(7) to find the cause (s) of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(7) Permitted leakage rates of the components and how to find the defective component
(a) The maximum permitted internal leakage for components related to the Yellow hydraulic system is:
Spoiler 4: 1.5 l.min (0.40 USgal.mn)
Spoiler 2: 0.8 l.min (0.21 USgal.mn)
THS actuator servovalve: 0.75 l.min (0.20 USgal.mn)
Elevator servocontrol: 1.5 l.min (0.40 USgal.mn)
Rudder servocontrol: 2.1 l.min (0.55 USgal.mn)
Yaw damper actuator: 1.3 l.min (0.34 USgal.mn)
Flap PCU valve block: 0.2 l.min (0.05 USgal.mn)
1 Listen to the pipes and components which can be the cause.
2 Touch the pipes and components, a high leakage rate will cause an increase in their temperature.
5. Close-upNOTE: You can do this test with or without an ultrasonic flow meter. If the internal leakage is out of limits then ultrasonic flow meter must be used to prevent an aircraft-on-ground (AOG) condition.
(1) Measure the internal leakage of the Yellow hydraulic system (complete) without an ultrasonic flow meter: (a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASURMENT VALVES/Y P/BSW is set to on (OFF light not on).
(b) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(c) Monitor the flow shown on the ground supply flowmeter. It must not be more than 7.2 l.min (1.90 USgal.mn).
(d) If the internal leakage is too much:
1 Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-864-002).
2 Disconnect the ground hydraulic supply from the aircraft ground test connections.
3 Pressurize the Yellow hydraulic system
with the electric pump (Ref. AMM TASK 29-24-00-863-001).
4 Do the leakage check of all sections of the Yellow hydraulic system to find the cause of high leakage.
(2) Measure the Yellow hydraulic system (central section) internal leakage with an ultrasonic flow meter:
(a) On the ECAM control panel on the center pedestal, push the HYD P/B. Make sure that the lower DU shows the HYD page.
(b) On the overhead maintenance panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/G P/BSW to OFF (the OFF light is on).
(c) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the color of the flow arrow and system name of the Yellow system is amber).
(d) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(e) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(f) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(g) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use detergent to clean the leakage transducer (5).
(h) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(i) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(j) Connect the leakage transducer cable (8) to the transmitter (9).
(k) Refer to the ground instruction manual of the ultrasonic flow meter to set:
- The serial number of the airplane
- The input location code on the ultrasonic flow meter to numeric code: 52690909 (Yellow central section).
(m) Monitor the flow on the ultrasonic flow meter display. It must not be more than 2.0 l.min (0.53 USgal.mn).
(n) If the internal leakage is more than 2.0 l.min (0.53 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(o) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(p) Disconnect the leakage transducer cable (8) from the transmitter (9).
(3) Measure the Yellow hydraulic system (complete section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
- The serial number of the airplane
- The input location code on the ultrasonic flow meter to numeric code: 66558384 (Yellow complete section).
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 5.3 l.min (1.40 USgal.mn).
(m) If the internal leakage is more than 5.3 l.min (1.40 USgal.mn) do the measurements that follow to find the cause of the high internal leakage:
- Measure of the internal leakage of the rear section of the Yellow hydraulic system Para A.(4)
- Measure the internal leakage of the left wing section of the Yellow hydraulic system Para A.(5)
- Measure the internal leakage of the right wing section of the Yellow hydraulic system Para A.(6).
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(4) Measure of the Yellow hydraulic system (rear section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
- The serial number of the airplane
- The input location code on the ultrasonic flow meter to numeric code: 98512388 (Yellow rear section).
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 4.3 l.min (1.14 USgal.mn).
(m) If the internal leakage is more than 4.3 l.min (1.14 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(5) Measure the Yellow hydraulic system (left wing section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remainig acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 First guide the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) to the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
- The serial number of the airplane
- The input location code on the ultrasonic flow meter to numeric code: 24561421 (Yellow left wing section).
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 1.6 l.min (0.42 USgal.mn).
(m) If the internal leakage is more than 1.6 l.min (0.42 USgal.mn) do the steps in Para A.(7) to find the cause of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(6) Measure of the Yellow hydraulic system (right wing section) internal leakage with an ultrasonic flow meter:
(a) On the overhead maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G P/BSW is set to on (the OFF light is off).
(b) Refer to the lower DU of the ECAM (HYD page) to make sure that the solenoid valve operation is correct (the flow arrow of the Yellow hydraulic system is green and the system name is white).
(c) On the overhead panel 40VU, make sure that the PTU P/BSW is set to OFF (the OFF light is on).
(d) Refer to the ground instruction manual of the ultrasonic flow meter to make sure that the correct software is installed.
(e) Clean the tube (1) between the identification tapes (2) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(f) Remove the remaining acoustic coupling compound from the leakage transducer (5) with a Textile-Lint free Cotton - (Material No.14SBA1) . Do not use a detergent to clean the leakage transducer (5).
(g) Apply a thin layer of the acoustic coupling compound (part of USF FLUXUS GST 6108, 610007AB TOOL-MEASURE,HYDRAULIC FLOW) to the contact surfaces of the leakage transducer (5).
(h) Install the leakage transducer (5) between the identification tapes (2) on the pipe (1):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to the stop.
2 Put the leakage transducer (5) in position on the pipe (1) between the identification tapes (2) and push it tightly on the pipe (1).
3 Push the knurled screw (6) in and attach the fastening strap (4) around the pipe (1) with the thread element (3).
4 Put the fastening strap (4) through the upper slot of the strap clamp (7) and then through the lower one.
5 Make sure that the fastening strap (4) has the correct tension. And make sure that the knurled screw (6) is pushed in up to the stop.
6 Tighten the knurled screw (6) to attach the leakage transducer (5) to the pipe (1).
(i) Connect the leakage transducer cable (8) with the transmitter (9).
(j) Refer to the ground instruction manual of the ultrasonic flow meter to set:
- The serial number of the airplane
- The input location code on the ultrasonic flow meter to numeric code: 23574435 (Yellow right wing section).
(l) Monitor the flow on the ultrasonic flow meter display. It must not be more than 1.6 l.min (0.42 USgal.mn).
(m) If the internal leakage is more than 1.6 l.min (0.42 USgal.mn) do the steps in Para A.(7) to find the cause (s) of the high internal leakage.
(n) Remove the leakage transducer (5):
1 Hold the leakage transducer (5) and turn the knurled screw (6) counterclockwise to disconnect the leakage transducer (5) from the pipe (1).
2 Push the knurled screw (6) in and disconnect the fastening strap (4) from the strap clamp (7).
3 Remove the leakage transducer (5) from the pipe (1).
(o) Disconnect the leakage transducer cable (8) from the transmitter (9).
(7) Permitted leakage rates of the components and how to find the defective component
(a) The maximum permitted internal leakage for components related to the Yellow hydraulic system is:
Spoiler 4: 1.5 l.min (0.40 USgal.mn)
Spoiler 2: 0.8 l.min (0.21 USgal.mn)
THS actuator servovalve: 0.75 l.min (0.20 USgal.mn)
Elevator servocontrol: 1.5 l.min (0.40 USgal.mn)
Rudder servocontrol: 2.1 l.min (0.55 USgal.mn)
Yaw damper actuator: 1.3 l.min (0.34 USgal.mn)
Flap PCU valve block: 0.2 l.min (0.05 USgal.mn)
NOTE: The maximum leakage rates for components are given only to assist in trouble shooting. The total leakage of components in a section (left wing, right wing etc) of the system must be less than the leakage permitted for that section. Also, the sum of all leakages of all the sections must not be more than the leakage permitted for the full system.
(b) If the internal leakage rate is too high you can find the defective component if you: 1 Listen to the pipes and components which can be the cause.
2 Touch the pipes and components, a high leakage rate will cause an increase in their temperature.
CAUTION:
DO NOT DISCONNECT AND CAP THE RETURN LINE FROM A SERVOCONTROL TO DO A LEAKAGE CHECK. IF A SUPPLY OF SYSTEM PRESSURE GETS TO THE SERVOCONTROL IT CAN CAUSE DAMAGE IF THERE IS NO RETURN FLOW.
(c) If you think that a servocontrol is the cause, disconnect and cap the supply to the servocontrol. Do the test again and if the leakage rate is in limits, the servocontrol is the defective component. Subtask 29-00-00-860-057-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to the serviceable condition.
(1) On the overhead maintenance panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/Y P/BSW to on. Make sure that the OFF light goes off.
(2) Refer to the lower DU of the ECAM (HYD page) and make sure that the solenoid valve has operated correctly (the flow arrow of the Yellow hydraulic system is colored green and the system name is colored white).
(3) On the overhead panel 40VU, set the PTU P/BSW to AUTO (the OFF and FAULT lights are not on).
(4) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(5) Disconnect the ground hydraulic supply from the aircraft ground test connections.
(6) Install the blanking caps on the test connections.
(7) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(8) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(9) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
Subtask 29-00-00-410-056-A ** ON A/C NOT FOR ALL (1) On the overhead maintenance panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/Y P/BSW to on. Make sure that the OFF light goes off.
(2) Refer to the lower DU of the ECAM (HYD page) and make sure that the solenoid valve has operated correctly (the flow arrow of the Yellow hydraulic system is colored green and the system name is colored white).
(3) On the overhead panel 40VU, set the PTU P/BSW to AUTO (the OFF and FAULT lights are not on).
(4) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(5) Disconnect the ground hydraulic supply from the aircraft ground test connections.
(6) Install the blanking caps on the test connections.
(7) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(8) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(9) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 196BB 198CB.
Subtask 29-00-00-860-057-B ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 196BB 198CB.
C. Put the aircraft back to the serviceable condition.
(1) On the overhead maintenance panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/Y P/BSW to on. Make sure that the OFF light goes off.
(2) Refer to the lower DU of the ECAM (HYD page) and make sure that the solenoid valve operates correctly (the flow arrow of the Yellow hydraulic system is colored green and the system name is colored white).
(3) On the overhead panel 40VU, set the PTU P/BSW to AUTO (the OFF and FAULT lights are off).
(4) Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-24-00-864-001).
(5) If an ultrasonic flow meter was not used, disconnect the ground hydraulic supply from the aircraft ground test connections.
(6) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(7) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(8) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
Subtask 29-00-00-410-056-B ** ON A/C NOT FOR ALL (1) On the overhead maintenance panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/Y P/BSW to on. Make sure that the OFF light goes off.
(2) Refer to the lower DU of the ECAM (HYD page) and make sure that the solenoid valve operates correctly (the flow arrow of the Yellow hydraulic system is colored green and the system name is colored white).
(3) On the overhead panel 40VU, set the PTU P/BSW to AUTO (the OFF and FAULT lights are off).
(4) Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-24-00-864-001).
(5) If an ultrasonic flow meter was not used, disconnect the ground hydraulic supply from the aircraft ground test connections.
(6) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(7) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(8) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 196BB.
(3) If necessary, close the access door 198CB.
Subtask 29-00-00-865-056-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 196BB.
(3) If necessary, close the access door 198CB.
E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N30 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N31 |
| ** ON A/C ALL | |||
| 123VU | Y HYD/ELEC/PUMP | 3802GX | AB06 |
| 123VU | Y HYD/ELEC/ELEC PUMP/NORM | 3801GX | AB03 |