Loss of the System Pressure of the Blue Hydraulic System

TASK 29-12-00-810-805-A
Loss of the System Pressure of the Blue Hydraulic System

1. Possible Causes

SYSTEM-PRESS-SW [2151GN]
P/BSW (1884GP)
wiring
MANIFOLD, HP (2111GM)
accumulator

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 29-12-14-000-001	Removal of the HP Manifold of the Blue Hydraulic System
AMM 29-12-14-400-001	Installation of the HP Manifold of the Blue Hydraulic System
AMM 29-12-42-000-001	Removal of the Blue Power Accumulator
AMM 29-12-42-400-001	Installation of the Blue Power Accumulator
AMM 29-14-00-614-002	Pressurization of the Hydraulic Reservoirs through the Ground Connector
ASM 291901
ASM 293201
AMM 29-32-12-000-002	Removal of the System Pressure Switch
AMM 29-32-12-400-002	Installation of the System Pressure Switch
ASM 315202
AMM 31-60-00-860-001	EIS Start Procedure
AMM 31-60-00-860-002	EIS Stop Procedure
AMM 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-028	Engine Shutdown

3. Fault Confirmation
Subtask 29-12-00-865-053-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 29-12-00-860-053-A ** ON A/C NOT FOR ALL

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) 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 is shown on the ECAM lower Display Unit (DU).
(4) Make sure that the ECAM does not show any of these conditions:

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

(5) If necessary, pressurize the reservoir AMM 29-14-00-614-002.
(6) If necessary, add fluid to the 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 (ON light not on).
(8) Start one engine AMM 71-00-00-710-003.
(9) Look for fault indications on the upper and lower ECAM DU.

Subtask 29-12-00-860-053-B ** ON A/C NOT FOR ALL

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.

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

4. Fault Isolation
Subtask 29-12-00-810-055-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 confimation gives:

The message HYD B SYS LO PR on the upper ECAM DU
The system name and the flow arrow of the Blue hydraulic system in amber on the lower ECAM DU:

(a) Do a check of the system pressure on the lower ECAM DU and on the system accumulator gage (2072GM).
(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 [2151GN] 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 [2151GN] AMM 29-32-12-000-002 and AMM 29-32-12-400-002.

2 If there is no continuity:

Do a check and repair the wiring between the SYSTEM-PRESS-SW [2151GN] connector A/C and the FWC-1/ FWC-2 connector AA/06G ASM 293201 and ASM 315202.

(b) If the rudder does not operate:

Do a check for 28VDC at the SOL VALVE-LEAKAGE MEAS, B (2160GP) connector A/A and the connector A/B ASM 291901. The correct value is 0 VDC.

1 If there is 28VDC:

Do a check of the wiring between the P/BSW (1884GP) connector C2 and the connector C3 ASM 291901.

a If there is continuity:

Replace the P/BSW (1884GP).

b If there is no continuity:

Do a check and repair the wiring between the P/BSW (1884GP) connector C3 and the CB (1881GP) ASM 291901.

Replace the MANIFOLD, HP (2111GM) AMM 29-12-14-000-001 and AMM 29-12-14-400-001.

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

Replace the accumulator AMM 29-12-42-000-001 and AMM 29-12-42-400-001
Do a check for external leakage and repair the components as necessary.

Subtask 29-12-00-860-054-A

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

5. Close-up
Subtask 29-12-00-860-055-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Stop the engine AMM 71-00-00-710-028.
(2) Do the EIS stop procedure
AMM 31-60-00-860-002.
(3) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

Subtask 29-12-00-860-055-B ** ON A/C NOT FOR ALL

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