DOC AIRBUS | TSM A320FLoss of the System Pressure of the Yellow Hydraulic System
TASK 29-13-00-810-805-A
Loss of the System Pressure of the Yellow Hydraulic System
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 29-13-00-865-053-A
Subtask 29-13-00-810-056-C
(1) If the fault confirmation gives the system name and the flow arrow of the Yellow hydraulic system in amber (on the lower ECAM DU):
(a) If the rudder operates, do a check for continuity between:
2 If there is no continuity, do a check and repair the wiring between the:
(c) If the fault continues:
P/BSW (1883GP) .
2 If there is no continuity, do a check and repair the wiring between the:
Subtask 29-13-00-860-054-A
Subtask 29-13-00-860-055-A
[Rev.8 from Aug 2018]
2026.04.04 04:39:52 UTC
Loss of the System Pressure of the Yellow Hydraulic System
1. Possible Causes
- SYSTEM-PRESS-SW [3151GN]
- wiring
- RELAY-SCCB PWR SPLY [3811GX]
- TIME RELAY [3816GX]
- RELAY-TIME [6MJ]
P/BSW (1883GP) - accumulator
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 29-10-00-863-002 | Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart |
| AMM 29-10-00-864-002 | Depressurize the Yellow Hydraulic System |
| AMM 29-13-14-000-001 | Removal of the HP Manifold of the Yellow Hydraulic System |
| AMM 29-13-14-400-001 | Installation of the HP Manifold of the Yellow Hydraulic System |
| AMM 29-13-42-000-001 | Removal of the Yellow Power Accumulator |
| AMM 29-13-42-400-001 | Installation of the Yellow 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 29-24-00-863-001 | Pressurize the Yellow Hydraulic System with the Electric Pump |
| AMM 29-24-00-864-001 | Depressurize the Yellow Hydraulic System |
| ASM 292401 | |
| ASM 293201 | |
| AMM 29-32-12-000-003 | Removal of the System Pressure Switch |
| AMM 29-32-12-400-003 | Installation of the System Pressure Switch |
| ASM 315202 |
Subtask 29-13-00-865-053-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 29-13-00-860-053-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/SOL VALVES/G/Y/B/LEAK/TST | 1881GP | N35 |
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/MONG | 3700GD | Q37 |
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/CTL | 3701GD | Q36 |
B. Aircraft Maintenance Configuration
(2) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(3) On panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/Y pushbutton switch is set to on (OFF light not on).
(4) Pressurize the Yellow hydraulic system from a ground supply or with the Yellow electric pump AMM 29-10-00-863-002 or AMM 29-24-00-863-001.
(5) Look for fault indications on the lower ECAM DU.
4. Fault IsolationWARNING:
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/Y pushbutton switch is set to on (OFF light not on).
(4) Pressurize the Yellow hydraulic system from a ground supply or with the Yellow electric pump AMM 29-10-00-863-002 or AMM 29-24-00-863-001.
(5) Look for fault indications on the lower ECAM DU.
Subtask 29-13-00-810-056-C
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.
A. Fault Confirmation (1) If the fault confirmation gives the system name and the flow arrow of the Yellow 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 (3072GM).
(a) If the rudder operates, do a check for continuity between:
- The SYSTEM-PRESS-SW [3151GN] connector A/A and the connector A/C (with the hydraulic system pressurized) ASM 293201.
2 If there is no continuity, do a check and repair the wiring between the:
- SYSTEM-PRESS-SW [3151GN] connector A/C and FWC-1/ FWC-2 connector AD/06E ASM 293201 and ASM 315202.
- Solenoid valve (3160GP) 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 for 28 VDC between: - The relay (3811GX) connector X1 and X2.
- Relay (3811GX) connector X1 and the HYD YELLOW ELEC PUMP P/BSW (3804GX) connector A3 ASM 291901 and ASM 292401.
(c) If the fault continues:
- Replace the TIME RELAY [3816GX] .
- Replace the RELAY-TIME [6MJ] .
- Do a check for 28 VDC between the P/BSW (1883GP) connector C2 and the connector C3.
2 If there is no continuity, do a check and repair the wiring between the:
- P/BSW (1883GP) connector C3 and the CB (1881GP) ASM 291901.
- Replace the MANIFOLD, HP (3014GM) AMM 29-13-14-000-001 and AMM 29-13-14-400-001.
- Replace the accumulator AMM 29-13-42-000-001 and AMM 29-13-42-400-001
- Do a check for external leakage and repair the components as necessary.
B. Do the fault confirmation procedure as given in Para. 3. to make sure that operation is correct.
5. Close-upSubtask 29-13-00-860-055-A
A. Aircraft Maintenance Configuration
(1) De-pressurize the Yellow hydraulic system AMM 29-10-00-864-002 or AMM 29-24-00-864-001.
(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.
(1) De-pressurize the Yellow hydraulic system AMM 29-10-00-864-002 or AMM 29-24-00-864-001.
(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.