W DOC AIRBUS | AMM A320F

Functional Check of Priority Valves in Green, Blue and Yellow System

TASK 29-10-00-720-002-A
Functional Check of Priority Valves in Green, Blue and Yellow System

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
ZONE: 197
ZONE: 198
ZONE: 210
FIN: 1064GM
FIN: 2064GM
FIN: 3064GM
1. Reason for the Job
Refer to the MPD TASK: 291000-08
FUNCTIONAL CHECK OF PRIORITY VALVES IN GREEN, BLUE AND YELLOW SYSTEM
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
197
REAR FAIRING
198
REAR FAIRING
210
CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
197CB, 197EB, 198CB
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 12-12-29-611-001-A
Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A
Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
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 29-10-00-863-001-A
Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-002-A
Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A
Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01
Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-10-00-864-001-A
Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A
Depressurize the Yellow Hydraulic System
TASK 29-10-00-864-003-A
Depressurize the Blue Hydraulic System
TASK 29-14-00-614-002-A
Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01
Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 29-23-00-860-002-A
Connection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 31-60-00-860-001-A
EIS Start Procedure
3. Job Set-up
Subtask 29-10-00-860-076-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the isolation coupling 3701GM of the power transfer unit (PTU) is not disconnected (Ref. AMM TASK 29-23-00-860-002).
   (2) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
   (3) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
   (4) On the ECAM control panel, push the HYD key. Make sure that the HYD page comes into view on the ECAM lower display unit (DU).
   (5) Make sure that the ECAM system shows none of these conditions:
  • Low air pressure in the reservoirs of the Green, Blue or Yellow hydraulic systems
  • Low fluid contents in the reservoirs of the Green, Blue or Yellow hydraulic systems.
   (6) If necessary, pressurize the reservoir(s) (Ref. AMM TASK 29-14-00-614-002).
   (7) If necessary, add fluid to the reservoir(s) (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
   (8) On the overhead panel 40VU, push and release the PTU P/BSW. Make sure that the OFF light comes on.
   (9) Connect a hydraulic ground supply to the connections on the ground service panel of the Green hydraulic system (Ref. AMM TASK 29-10-00-863-001).
Subtask 29-10-00-865-063-A
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
105VUELEC/CSM/G /EV AUTO/SPLY7XEC01
106VUCSM/G /EV/MAN/SPLY6XEB04
121VUHYDRAULIC/SOL VALVES/G/Y/PTU1801GLN34
Subtask 29-10-00-865-065-A
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUHYD/HYD PWR/B WARN/& CTL2702GJC12
106VUESS TR/SPLY4PEC01
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN30
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN31
** ON A/C ALL
123VUB HYD/ELEC PUMP2701GJAB09
123VUY HYD/ELEC/PUMP3802GXAB06
123VUY HYD/ELEC/ELEC PUMP/NORM3801GXAB03
Subtask 29-10-00-010-063-A
D. Open these access panels:
4. Procedure
Subtask 29-10-00-720-050-A
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.
A. Do this test:
ACTION
RESULT
1.On the hydraulic ground supply:
  • Pressurize the Green hydraulic system to 125 bar (1800 psi).
2.On the overhead panel 40VU:
  • Push the PTU P/BSW.
On the overhead panel 40VU:
  • The PTU P/BSW OFF light goes off.
In the main landing gear compartment:
  • The PTU does not operate, because the priority valve closes at 130 +0 -3 bar (1885 +0 -43.5 psi).
On the lower ECAM DU:
  • The pressure in the Green hydraulic system is 125 bar (1800 psi).
On the Yellow hydraulic reservoir:
  • The pressure in the Yellow hydraulic system is 3.5 bar (51 psi) (Reservoir Pressure).
3.On the hydraulic ground supply:
  • Slowly increase the supply pressure to the Green hydraulic system to 160 bar (2325 psi).
In the main landing gear compartment:
  • The PTU starts to operate, because the priority valve opens at 140 +0 -5 bar (2030 +0 -72.5 psi).
On the lower ECAM DU:
  • The pressure in the Green hydraulic system is approximately 160 bar (2325 psi).
  • The pressure in the Yellow hydraulic system is no more than 14 bar (200 psi) less than the pressure in the Green hydraulic system.
4.On the hydraulic ground supply:
  • Slowly decrease the supply pressure to the Green hydraulic system to 125 bar (1800 psi).
In the main landing gear compartment:
  • The PTU stops when the priority valve closes (between 144 bar and 127 bar (2088 psi and 1842 psi)).
On the lower ECAM DU:
  • The pressure in the Green hydraulic system is 125 bar (1800 psi).
On the Yellow hydraulic reservoir:
  • The pressure in the Yellow hydraulic system is 3.5 bar (51 psi) (Reservoir Pressure).
5.On the hydraulic ground supply:
In the main landing gear compartment:
  • The PTU does not operate, because the priority valve closes at 130 +0 -3 bar (1885 +0 -43.5 psi).
6.On the hydraulic ground supply:
  • Disconnect the hydraulic ground supply from the ground service panel of the Green hydraulic system
  • Connect the hydraulic ground supply to the connections on the ground service panel of the Yellow hydraulic system (Ref. AMM TASK 29-10-00-863-002).
7.On the hydraulic ground supply:
  • Pressurize the Yellow hydraulic system to 125 bar (1800 psi).
On the lower ECAM DU:
  • The pressure in the Yellow hydraulic system is 125 bar (1800 psi)
  • The pressure in the Green hydraulic system is 3.5 bar (51 psi) (Reservoir Pressure).
8.On the hydraulic ground supply:
  • Slowly increase the supply pressure to the Yellow hydraulic system to 160 bar (2325 psi).
In the main landing gear compartment:
  • The PTU starts to operate because the priority valve is open at 140 +0 -5 bar (2030 +0 -72.5 psi).
On the lower ECAM DU:
  • The pressure in the Yellow hydraulic system is approximately 160 bar (2325 psi),
  • The pressure in the Green hydraulic system is no more than 14 bar (200 psi) less than the pressure in the Yellow hydraulic system.
9.On the hydraulic ground supply:
  • Slowly decrease the supply pressure to the Yellow hydraulic system to 125 bar (1800 psi).
In the main landing gear compartment:
  • The PTU stops when the priority valve closes (between 144 bar and 127 bar (2088 psi and 1842 psi)).
10.On the hydraulic ground supply:
  • Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002)
  • Disconnect the hydraulic ground supply from the ground service panel of the Yellow hydraulic system
  • Connect the hydraulic ground supply to the connections on the ground service panel of the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
11.On the hydraulic ground supply:
  • Pressurize the Blue hydraulic system to 125 bar (1800 psi).
12.On the overhead panel 21VU:
  • Lift the guard, and press and hold the EMER GEN TEST pushbutton.
On the lower ECAM DU:
  • The ELEC page replaces the HYD page.
In the main landing gear compartment:
  • The Constant Speed Motor/Generator (CSM/G) does not operate.
13.On the overhead panel 21VU:
  • Release the EMER GEN TEST pushbutton, and let the guard go back to its initial position.
14.On the hydraulic ground supply:
  • Slowly increase the supply pressure to the Blue hydraulic system to 160 bar (2325 psi).
15.On the overhead panel 21VU:
  • Lift the guard, and press and hold the EMER GEN TEST pushbutton.
In the main landing gear compartment:
  • The CSM/G starts to operate because the priority valve is open at 140 +0 -5 bar (2030 +0 -72.5 psi).
16.On the hydraulic ground supply:
  • Slowly decrease the supply pressure to the Blue hydraulic system to 125 bar (1800 psi).
In the main landing gear compartment:
  • The CSM/G stops when the priority valve closes (between 144 bar and 127 bar (2088 psi and 1842 psi).
On the hydraulic ground supply:
17.On the overhead panel 21VU:
  • release the EMER GEN TEST pushbutton, and let the guard go back to its initial position.
5. Close-up
Subtask 29-10-00-860-077-A
A. Put the aircraft back to the serviceable condition.
   (1) Disconnect the hydraulic ground supply from the ground service panel of the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).
   (2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
Subtask 29-10-00-410-063-A
B. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the access panels:
Subtask 29-10-00-865-064-A
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUHYD/HYD PWR/B WARN/& CTL2702GJC12
106VUESS TR/SPLY4PEC01
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN30
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN31
** ON A/C ALL
123VUB HYD/ELEC PUMP2701GJAB09
123VUY HYD/ELEC/PUMP3802GXAB06
123VUY HYD/ELEC/ELEC PUMP/NORM3801GXAB03
[Rev.10 from 2021] 2026.04.01 00:14:09 UTC
"Aviabrain" 2025