Loss of the System Pressure of the Green Hydraulic System

TASK 29-11-00-810-805-A
Loss of the System Pressure of the Green Hydraulic System

1. Possible Causes

SYSTEM-PRESS-SW [1151GN]
P/BSW (1882GP)
wiring
MANIFOLD,HP [1111GM]
accumulator

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 29-10-00-863-001	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-864-001	Depressurize the Green Hydraulic System
AMM 29-11-14-000-001	Removal of the HP Manifold of the Green Hydraulic System
AMM 29-11-14-400-001	Installation of the HP Manifold of the Green Hydraulic System
AMM 29-11-42-000-001	Removal of the Green Power Accumulator
AMM 29-11-42-400-001	Installation of the Green Power Accumulator
ASM 291901
AMM 29-23-00-860-001	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
AMM 29-23-00-860-002	Connection of the Isolation Coupling of the Power Transfer Unit (PTU)
AMM 29-23-00-863-001	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
AMM 29-23-00-864-001	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
ASM 293201
AMM 29-32-12-000-001	Removal of the System Pressure Switch
AMM 29-32-12-400-001	Installation of the System Pressure Switch
ASM 315202

3. Fault Confirmation
Subtask 29-11-00-865-053-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
** ON A/C ALL
121VU	HYDRAULIC/SOL VALVES/G/Y/B/LEAK/TST	1881GP	N35
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34

Subtask 29-11-00-860-053-A

B. Aircraft Maintenance Configuration

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

(1) Disconnect the isolation coupling of the PTU AMM 29-23-00-860-001.
(2) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(3) On panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/G pushbutton switch is set to on (OFF light not on).
(4) Pressurize the Green hydraulic system from a ground supply or through the PTU AMM 29-10-00-863-001 or AMM 29-23-00-863-001.
(5) Look for fault indications on the lower ECAM DU.

4. Fault Isolation
Subtask 29-11-00-810-056-B

A. Fault Confirmation

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) If the fault confirmation gives the system name and the flow arrow of the Green hydraulic system in amber (on the lower ECAM DU):

do a check of the system pressure on the lower ECAM DU and on the system accumulator gage (1072GM).

(2) If the system pressure is more than 1450 psi:

use the rudder pedals to operate the rudder.

(a) If the rudder operates:

do a check for continuity between the:
SYSTEM-PRESS-SW [1151GN] connector A/A and the connector A/C (with the hydraulic system pressurized) ASM 293201.

1 If there is continuity:

replace the SYSTEM-PRESS-SW [1151GN] AMM 29-32-12-000-001 and AMM 29-32-12-400-001.

2 If there is no continuity:

do a check and repair the wiring between the:
SYSTEM-PRESS-SW [1151GN] connector A/C and FWC-1/ FWC-2 connector AA/06C ASM 293201 and ASM 315202.

(b) If the rudder does not operate:

do a check for 28 VDC at the:
SOL VALVE-LEAKAGE MEAS, G (1160GP) connector A/A and the connector A/B ASM 291901.

NOTE: There is usually 0 VDC.

1 If there is 28 VDC:

do a check of the wiring between:
the P/BSW (1882GP) connector C2 and the connector C3 ASM 291901.

a If there is continuity:

replace the P/BSW (1882GP).

b If there is no continuity:

do a check and repair the wiring between the:
P/BSW (1882GP) connector C3 and the CB (1881GP) ASM 291901.

replace the MANIFOLD,HP [1111GM] AMM 29-11-14-000-001 and AMM 29-11-14-400-001.

(3) If the pressure is less than 1450 psi:

replace the accumulator AMM 29-11-42-000-001 and AMM 29-11-42-400-001
do a check for external leakage and repair the components as necessary.

Subtask 29-11-00-860-055-A

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

5. Close-up
Subtask 29-11-00-860-054-A

A. Aircraft Maintenance Configuration
(1) De-pressurize the Green hydraulic system AMM 29-10-00-864-001 or AMM 29-23-00-864-001.
(2) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
(3) Connect the isolation coupling of the PTU AMM 29-23-00-860-002.

[Rev.8 from Aug 2018] 2026.04.04 04:39:52 UTC