Hydraulic-Pump Depressurization Test with the Multipurpose Control and Display Unit (MCDU) [PW11]

TASK 73-21-00-710-808-A
Hydraulic-Pump Depressurization Test with the Multipurpose Control and Display Unit (MCDU)

WARNING: WHEN YOU GO NEAR A JET ENGINE, BE CAREFUL TO STAY AWAY FROM THE INLET AREA. AN ENGINE HAS SUFFICIENT SUCTION AT THE INLET TO PULL A PERSON UP TO THE INLET OR INTO IT. THIS CAN CAUSE INJURY OR DEATH. THE INLET CAN ALSO PULL HATS, GLASSES, LOOSE CLOTHING, OR RAGS FROM POCKETS. REMOVE OR MAKE SAFE ALL LOOSE ITEMS BEFORE YOU DO WORK AROUND AN ENGINE.

WARNING: MAKE SURE THAT ALL ENGINE-IN-OPERATION AREAS (RAMPS, TAXIWAYS, RUNWAYS, ETC.) ARE SUFFICIENTLY CLEAN TO PREVENT INJURY TO THE PERSONS IN THE AREA AND DAMAGE TO THE ENGINE OR AIRCRAFT.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU MOTOR THE ENGINE. MOVEMENT OF THE FLIGHT CONTROL SURFACES CAN BE DANGEROUS AND/OR CAUSE DAMAGE.

WARNING: DO NOT TOUCH THE PROBES DURING OR IMMEDIATELY AFTER THIS PROCEDURE. THE PROBES WILL BE HOT AND CAN BURN YOU.

CAUTION: MAKE SURE THAT THERE IS NO HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT WHEN YOU DO THIS PROCEDURE. IF A GROUND POWER SUPPLY IS CONNECTED, THERE IS A RISK OF DAMAGE TO THE ENGINE PUMPS.

CAUTION: REMOVE THE PROTECTIVE COVERS FROM THE PROBES BEFORE YOU DO THIS PROCEDURE.

ZONE: 210

1. Reason for the Job
Use this test to do a check of depressurization of the engine hydraulic pump when the EEC controls EIU.
This test is applicable only to engines with FCS4.0 and subsequent EEC software.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

B. Referenced Information

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 29-30-00-200-002-A	Check of the Reservoir Quantity Indication on the ECAM Display Unit
TASK 31-32-00-860-012-A	Procedure to Get Access to the SYSTEM REPORT/TEST/ENG Page
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 36-12-00-860-802-A	Pressurization of the Bleed System with the APU
TASK 36-12-00-860-803-A	Pressurization of the Bleed System through the HP Ground Connector
TASK 71-00-00-720-814-A	Test No. 2A - Engine Motor Leak Test (Wet Method)
TASK 71-00-00-910-803-A	Engine Operation Limits and Guidelines
TASK 79-00-00-610-801-A	Check and Fill the Engine Oil
Hydraulic-Pump Depressurization Test

3. Job Set-up
Subtask 73-21-00-941-065-B ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that for all the engine motoring procedures, that you will do during this test, you obey the starter operation limits (Ref. AMM TASK 71-00-00-910-803).
(2) Purge the fuel lines, components and actuators of air. Do the Test No. 2A - Engine Motor Leak Test (Wet Method) (Ref. AMM TASK 71-00-00-720-814).
(a) The engine motor leak test (Wet Method) is not necessary if you did not disconnect fuel lines or replace actuators or components.
(b) If you did not disconnect fuel lines or replace actuators or components, go to the subsequent step.
(3) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(4) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE rotary selector switch is in the NORM position.
(b) Make sure that the ENG MASTER 1(2) switch control was in the OFF position not less than five minutes before you do this procedure.
(5) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(6) On overhead control and indicating panel 22VU:
(a) Make sure that the ON legend of the MAN START pushbutton switch is off.
(7) On RUD TRIM/PARKING BRK panel 110VU:
(a) Make sure that the parking-brake control switch is set to ON.
(8) On the right-center instrument panel 400VU, make sure that:
(a) The brake pressure indication on the Yellow brake-pressure triple-indicator is correct. If necessary, pressurize the brake accumulator with the Yellow pump (Ref. AMM TASK 29-10-00-863-002).
(9) Make sure that all the parts, tools, equipment and loose objects are removed from the engine air intake and the area around the intake.
(10) Obey the wind direction and velocity operation limits (Ref. AMM TASK 71-00-00-910-803).

Subtask 73-21-00-860-080-B ** ON A/C NOT FOR ALL

B. Preparation before Procedure
(1) Do the EIS start procedure (ECAM display units only) (Ref. AMM TASK 31-60-00-860-001).
(2) Do the procedure to get access to the SYSTEM REPORT/TEST ENG page (Ref. AMM TASK 31-32-00-860-012).

Subtask 73-21-00-875-050-B ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/SOL VALVES/G/Y/PTU	1801GL	N34
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
FOR FIN: 1000EM1 (ENGINE1)
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33
** ON A/C NOT FOR ALL
FOR FIN: 1000EM2 (ENGINE2)
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37
121VU	HYDRAULIC/Y HYD/PUMP ENG2/CTL	3701GD	Q36

Subtask 73-21-00-860-072-B ** ON A/C NOT FOR ALL

D. Continue to Prepare for the Test
(1) On the FUEL section of overhead panel 40VU:
(a) Push all the PUMPS pushbutton switches.
(b) Make sure that the OFF legend of these pushbutton switches go off.
(2) On the overhead circuit breaker panel 49VU:
(a) Open circuit breaker 1KC1(2) to open the LP valve.
(b) After a few seconds:

The single chime sounds.
The MASTER CAUT light comes on.
The ENG1(2) LP VALVE OPEN warning message comes into view on the upper ECAM DU.

(3) Supply the aircraft pneumatic system from a High Pressure (HP) ground power unit or the APU (Ref. AMM TASK 36-12-00-860-803) or (Ref. AMM TASK 36-12-00-860-802).
(4) Make sure that the thrust lever of the engine 1(2) is set to IDLE.
(5) On the lower ECAM display unit, get the ENG page:
(a) If necessary, service the engine oil system (Ref. AMM TASK 79-00-00-610-801).
(6) Check of the hydraulic reservoir
(a) On the lower ECAM display unit, get the HYDRAULIC page:
1 Make sure that the pressure of the Green reservoir for engine 1 (Yellow reservoir for engine 2) is correct.
2 Make sure that the reservoir fluid level is correct (Ref. AMM TASK 29-30-00-200-002).
(b) Make sure that the engine 1(2) pump is serviceable (on the HYD section of overhead panel 40VU, the OFF legend of the ENG 1(2) PUMP pushbutton switch must be off).
(7) Make sure that the aircraft is cleared and that there are no persons in the dangerous areas.

4. Procedure
Subtask 73-21-00-860-074-B ** ON A/C NOT FOR ALL

A. Get the starter operating limits (Ref. AMM TASK 71-00-00-910-803).

Subtask 73-21-00-710-055-B ** ON A/C NOT FOR ALL

B. Test(s)

CAUTION: DO NOT OPERATE THE STARTER FOR MORE THAN THE STARTER TIME LIMIT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE STARTER.

(1) Do the test as follows:

NOTE: On the MCDU, in the indication "MAKE SURE THAT HYDRAULIC CIRCUIT X" or "MAKE SURE THAT X HYDRAULIC PRESSURE":

X = GREEN if you do the test for engine 1,
X = YELLOW if you do the test for engine 2.

ACTION	RESULT
1. Make sure that the depressurization of the hydraulic circuit to be tested is not done on overhead panel 40VU: For engine 1: Push the GREEN/ENG1 PUMP pushbutton switch, if necessary. For engine 2: Push the YELLOW/ENG2 PUMP pushbutton switch, if necessary.	On overhead panel 40VU: For engine 1: The OFF legend of the GREEN/ENG1 PUMP pushbutton switch is off. For engine 2: The OFF legend of the YELLOW/ENG2 PUMP pushbutton switch is off.
2. On overhead panel 40VU: Push the PTU/AUTO pushbutton switch.	On overhead panel 40VU: The OFF legend of the PTU/AUTO pushbutton switch comes on.
3. For engine 2, make sure that the electric pump of the Yellow hydraulic system is not set to ON: Push the YELLOW/ELEC PUMP pushbutton switch, if necessary.	On overhead panel 40VU: The ON legend of the YELLOW/ELEC PUMP pushbutton switch is off.
On MCDU 1(2) (on center pedestal 11VU):	On MCDU 1(2) (on center pedestal 11VU):
4. Push the line key adjacent to the FADEC 1A(2A) indication.	The Electronic Engine Control (EEC) main menu comes into view.
5. Push the line key adjacent to the ENGINE TESTS indication.	The ENGINE TESTS page comes into view.
6. Push the line key adjacent to the HYDRAULIC PUMP DEPRESS TEST indication.	The HYDRAULIC PUMP DEPRESS TEST page comes into view.
7. On the center pedestal, on ENG panel 115VU: Set the MODE/CRANK/NORM/IGN/START selector switch to CRANK.
8. On MCDU 1(2): Push the line key adjacent to the START TEST indication.	On MCDU 1(2): The CONFIRM START OF TEST page comes into view.
9. Push the line key adjacent to the CONFIRM START OF TEST indication.	The TEST IN PROGRESS 1 page comes into view.
10. On overhead panel 22VU: Push the ENG/MAN START pushbutton switch.	On overhead panel 22VU: The ON legend of the ENG/MAN START pushbutton switch comes on.
11. On the lower ECAM display unit (HYD page), make sure that: For engine 1: The Green hydraulic pressure increases in less than 60 seconds. For engine 2: The Yellow hydraulic pressure increases in less than 60 seconds.
12. Push the line key adjacent to the YES indication. NOTE: If the hydraulic pressure does not increase, you can push the line key adjacent to the NO indication in less than 90 seconds. NOTE: If the NO indication is not set in less than 90 seconds, make sure that the failure indication "OPERATOR DID NOT RESPOND ON TIME" comes on.	The TEST IN PROGRESS 2 page comes into view. NOTE: If faults are detected or the line key adjacent to the NO indication was pushed, the TEST FAILURES page comes into view.
13. On the lower ECAM display unit (HYD page), make sure that: For engine 1: The Green hydraulic pressure decreases within 10 seconds. For engine 2: The Yellow hydraulic pressure decreases within 10 seconds.
14. PRE SB 73-00-0037-00A-930A-D (EEC software FCS5.0) Push the line key adjacent to the YES indication. NOTE: If the hydraulic pressure does not decrease, you can push the line key adjacent to the NO indication in less than 30 seconds. NOTE: If the NO indication is not set in less than 30 seconds, make sure that the failure indication "OPERATOR DID NOT RESPOND ON TIME" comes on. END OF PRE SB 73-00-0037-00A-930A-D (EEC software FCS5.0)	The TEST OK page comes into view. NOTE: If faults are detected or the line key adjacent to the NO indication was pushed, the TEST FAILURES page comes into view.
15. POST SB 73-00-0037-00A-930A-D (EEC software FCS5.0) Push the line key adjacent to the YES indication. NOTE: If the YES or NO indication is not set in less than 30 seconds, the TEST FAILURES page comes into view with the specific message "OPERATOR DID NOT RESPOND ON TIME". END OF POST SB 73-00-0037-00A-930A-D (EEC software FCS5.0)	The TEST IN PROGRESS page comes into view. "Test OK" or "Test Failures" indication will come into view up to 20 seconds: NOTE: If the line key adjacent to the NO indication was pushed, the TEST FAILURES page comes into view.
16. Push the line key adjacent to the RETURN indication.	The TEST CLOSE UP page comes into view.
17. On overhead panel 22VU: Push the ENG/MAN START pushbutton switch.	On overhead panel 22VU: The ON legend of the ENG/MAN START pushbutton switch goes off.
18. On the center pedestal, on ENG panel 115VU: Set the MODE/CRANK/NORM/IGN/START selector switch to NORM.
19. On overhead panel 40VU: Push the PTU/AUTO pushbutton switch.	On overhead panel 40VU: The OFF legend of the PTU/AUTO pushbutton switch goes off.
20. Wait for the engine spool down.
21. Push the line key adjacent to the RETURN indication until you get the SYSTEM REPORT/TEST/ENG page.	The SYSTEM REPORT/TEST/ENG page comes into view.
22. Do again steps 1 to 19 for channel B of the Full Authority Digital Engine Control (FADEC) system.

(2) Make a record of any fault messages that you see on the MCDU screen.

NOTE: The table below shows maintenance and ECAM messages which may sometimes be set for reasons which are not necessary for the normal corrective action. The recommended actions for these messages must be done to prevent delays because of corrective actions that are incorrect or not necessary.

Table 1 - Nuisance Fault - Interactive Mode

Software Effectivity	Maintenance Message	ECAM Message	Nuisance Cause	Recommended Action
All software versions:	00000 Failure Detected	-	This message is set when no faults are present during the interactive tests.	No action required. Ignore this message.
All software versions:	(None shown)	ENGX FUEL FILTER DEGRAD	This message is set during the interactive mode engine-tests when it is not supposed to be set.	No action required. Ignore this message in the interactive mode.
All software versions:	(None shown)	ENGX OIL FILTER DEGRAD	This message is set during the interactive mode engine-tests when it is not supposed to be set.	No action required. Ignore this message in the interactive mode.
POST SB C-73-00-0037A (EEC Software FCS 5) and subsequent:	ENGXD-0693-STARTER SPEED SNSR DISAGREE	N/A	This message is set during the interactive mode engine-tests when it is not supposed to be set.	Ignore this maintenance message in the interactive mode. An engine dry motor and a check of the ground scanning report is necessary to confirm this fault.

5. Close-up
Subtask 73-21-00-860-075-B ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) On the FUEL section of the overhead panel 40VU:

Release all the PUMPS pushbutton switches
Make sure that the OFF legends of these pushbutton switches come on.

(2) Stop the pneumatic air supply to the aircraft:

Disconnect the HP ground power unit or stop the APU (Ref. AMM TASK 36-12-00-860-803) (Ref. AMM TASK 36-12-00-860-802).

(3) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
(4) On the overhead circuit-breaker panel 49VU:

Close the circuit breaker 1KC1 and 1KC2.

(5) On the upper ECAM display unit:

The ENG1(2) LP VALVE OPEN warning message goes out of view.

(6) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(7) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.01 03:02:32 UTC