Blue System Pressure Indication on ECAM DU is out of Tolerance

TASK 29-12-00-810-811-A
Blue System Pressure Indication on ECAM DU is out of Tolerance

1. Possible Causes

internal leakage
PACKAGE E-PUMP [2075GJ]
HYDR. PRESSURE TRANSMITTER [2065GN]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 12-12-29-611-001	Fill the Hydraulic Fluid Reservoir with a Hand Pump
AMM 12-12-29-611-002	Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 29-00-00-280-002	Check of the Internal Leakage of the Blue Hydraulic System
AMM 29-10-00-863-003	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-864-003	Depressurize the Blue Hydraulic System
AMM 29-12-51-000-001	Removal of the Electric Pump
AMM 29-12-51-400-001	Installation of the Electric Pump
AMM 29-14-00-614-002	Pressurization of the Hydraulic Reservoirs through the Ground Connector
AMM 29-24-51-000-001	Removal of the Electric Pump
AMM 29-24-51-400-001	Installation of the Electric Pump
AMM 29-32-11-000-002	Removal of the Hydraulic Pressure Transducer
AMM 29-32-11-400-002	Installation of the Hydraulic Pressure Transducer
AMM 31-60-00-860-001	EIS Start Procedure
AMM 31-60-00-860-002	EIS Stop Procedure

3. Fault Confirmation
Subtask 29-12-00-865-057-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
121VU	HYDRAULIC/SOL VALVES/G/Y/B/LEAK/TST	1881GP	N35
123VU	B HYD/ELEC PUMP	2701GJ	AB09

Subtask 29-12-00-860-060-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
(3) On the ECAM control panel on the center pedestal, press the HYD pushbutton. Make sure that the HYD page shows on the ECAM lower Display Unit (DU).
(4) Make sure that the ECAM does not show one or more of these conditions:

Low air pressure in the Blue reservoir
Low fluid level in the Blue reservoir.

(5) If necessary, pressurize the Blue reservoir AMM 29-14-00-614-002.
(6) If necessary, add fluid to the Blue reservoir AMM 12-12-29-611-001 or AMM 12-12-29-611-002.
(7) On panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/B pushbutton switch is set to OFF (the OFF light is on).

Subtask 29-12-00-710-063-A

C. Test

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE.

(1) Pressurize the Blue hydraulic system with the electric pump AMM 29-10-00-863-003.
(2) Look for the Blue hydraulic system pressure indication on the lower ECAM DU.

4. Fault Isolation
Subtask 29-12-00-810-061-A

A. If the fault confirmation gives:

A system pressure indication of 2750 psi on the lower ECAM DU:

(1) On the panel 50VU, set the HYD/LEAK MEASUREMENT VALVES/B pushbutton switch to on (the OFF light is not on).
(a) If the system pressure increases:
1 On the panel 50VU, set the HYD/LEAK MEASUREMENT VALVES/B pushbutton switch to off (the OFF light is on).
2 De-pressurize the Blue hydraulic system AMM 29-10-00-864-003.
3 Do a check of the internal leakage of the Blue hydraulic system AMM 29-00-00-280-002 and do the necessary repair procedures.
(b) If the system pressure does not increase:
1 Replace the PACKAGE E-PUMP [2075GJ] AMM 29-12-51-000-001 and AMM 29-12-51-400-001.
2 Replace the ELEC PUMP-B (2075GJ) with the ELEC PUMP-Y (3075GX) which is interchangeable, if a new pump is not available AMM 29-24-51-000-001 and AMM 29-24-51-400-001.
(c) If the fault continues, replace the HYDR. PRESSURE TRANSMITTER [2065GN] AMM 29-32-11-000-002 and AMM 29-32-11-400-002.
(d) If the fault continues, obey the subsequent causes:

The internal leakage in the Blue hydraulic system is a bit higher than usual (special for older A/C).
There is an additional ECAM tolerance of +/- 50 psi, the system pressure indication on the ECAM is in 50 psi steps.

Subtask 29-12-00-860-056-A

B. Do the fault confirmation procedure as given in Para. 3. to make sure that operation is correct.

5. Close-up
Subtask 29-12-00-860-061-A

A. Put the aircraft back to the serviceable condition.
(1) Do the EIS stop procedure
AMM 31-60-00-860-002.
(2) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:29:22 UTC