DOC AIRBUS | AMM A320FDrainage of the Reservoir of the Yellow Hydraulic System
TASK 29-10-00-680-002-A
Drainage of the Reservoir of the Yellow Hydraulic System
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 29-10-00-865-073-A
Subtask 29-10-00-680-051-A
Subtask 29-10-00-860-060-A
[Rev.10 from 2021]
2026.04.01 00:13:47 UTC
Drainage of the Reservoir of the Yellow Hydraulic System
FIN: 3000GQ
1. Reason for the JobNOTE: If the hydraulic reservoir is too full, it is necessary to adjust the fluid level accurately. It is not necessary to drain the hydraulic reservoir fully.
2. Job Set-up InformationA. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | CONTAINER - HYDRAULIC FLUID RESISTANT |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | 2 | WARNING NOTICE(S) |
| No specific | 1 | WRENCH - STANDARD |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 196BB, 198CB |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-12-29-611-001-A | Fill the Hydraulic Fluid Reservoir with a Hand Pump |
| TASK 12-12-29-611-002-A | Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart |
| TASK 29-00-00-864-001-A | Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action |
| TASK 29-00-00-910-002-A | Safety Procedures of the Hydraulic System |
| TASK 29-14-00-614-001-A | Depressurization of the Hydraulic Reservoirs |
| TASK 29-23-00-860-001-A | Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| TASK 29-23-00-860-002-A | Connection of the Isolation Coupling of the Power Transfer Unit (PTU) |
Drain Valve LocationsSubtask 29-10-00-865-073-A
A. Open, safety and tag this(these) circuit breaker(s):
Subtask 29-10-00-941-057-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N30 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LOW/LVL/IND | 1832GQ | N32 |
| 121VU | HYDRAULIC/HYD/QTY/IND | 1831GQ | P35 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N31 |
| ** ON A/C ALL | |||
| 123VU | Y HYD/ELEC/PUMP | 3802GX | AB06 |
| 123VU | Y HYD/ELEC/ELEC PUMP/NORM | 3801GX | AB03 |
B. Safety Precautions
(1) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system.
Subtask 29-10-00-010-070-A Subtask 29-10-00-860-059-A (1) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system.
- In the cockpit on hydraulic section 40VU of the overhead panel
- On the ground service panel of the Yellow hydraulic system.
D. Aircraft Maintenance Configuration
(2) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(3) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(4) Disconnect the isolation coupling of the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-860-001).
(5) Put the CONTAINER - HYDRAULIC FLUID RESISTANT in position so that you can drain the hydraulic fluid into it.
4. ProcedureWARNING:
OBEY THE HYDRAULIC SAFETY PROCEDURES.
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002). (2) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(3) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(4) Disconnect the isolation coupling of the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-860-001).
(5) Put the CONTAINER - HYDRAULIC FLUID RESISTANT in position so that you can drain the hydraulic fluid into it.
NOTE: The reservoir and its related system contains 40 l (10.5668 USgal) of hydraulic fluid when it is full.
Subtask 29-10-00-680-051-A
A. Drainage of the Reservoir
(1) Take flexible hose 1699GM out from its stowage on the ground service panel of the Green hydraulic system.
(2) Connect the flexible hose to the reservoir drain valve.
(4) Turn the drain valve counterclockwise.
(6) When the reservoir is empty, turn the drain valve counterclockwise and release.
(7) Turn the drain valve clockwise to lock it in the closed position.
5. Close-up(1) Take flexible hose 1699GM out from its stowage on the ground service panel of the Green hydraulic system.
(2) Connect the flexible hose to the reservoir drain valve.
NOTE: It is necessary to use the WRENCH - STANDARD to hold the body of the reservoir drain valve when the flexible hose is connected.
(3) Put the other end of the flexible hose in the container. (4) Turn the drain valve counterclockwise.
NOTE: When you turn the drain valve counterclockwise, no fluid will flow until you push the valve in.
(5) Push the drain valve in and turn the valve clockwise to lock the drain valve in the open position. (6) When the reservoir is empty, turn the drain valve counterclockwise and release.
(7) Turn the drain valve clockwise to lock it in the closed position.
Subtask 29-10-00-860-060-A
A. Put the aircraft back to the serviceable condition.
(1) Disconnect the flexible hose from the reservoir drain valve.
(3) Put the flexible hose in its stowage on the ground service panel of the Green hydraulic system.
(4) Fill the Yellow reservoir with a hand pump (Ref. AMM TASK 12-12-29-611-001), or with a hydraulic service cart (Ref. AMM TASK 12-12-29-611-002).
(5) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
(6) Remove the container.
(7) Remove the WARNING NOTICE(S).
Subtask 29-10-00-410-070-A (1) Disconnect the flexible hose from the reservoir drain valve.
NOTE: It is necessary to use the WRENCH - STANDARD to hold the body of the reservoir drain valve when the flexible hose is disconnected.
(2) Make sure that the flexible hose contains no hydraulic fluid. (3) Put the flexible hose in its stowage on the ground service panel of the Green hydraulic system.
(4) Fill the Yellow reservoir with a hand pump (Ref. AMM TASK 12-12-29-611-001), or with a hydraulic service cart (Ref. AMM TASK 12-12-29-611-002).
(5) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
(6) Remove the container.
(7) Remove the WARNING NOTICE(S).
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access doors 196BB 198CB.
Subtask 29-10-00-865-074-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access doors 196BB 198CB.
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N30 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LOW/LVL/IND | 1832GQ | N32 |
| 121VU | HYDRAULIC/HYD/QTY/IND | 1831GQ | P35 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N31 |
| ** ON A/C ALL | |||
| 123VU | Y HYD/ELEC/PUMP | 3802GX | AB06 |
| 123VU | Y HYD/ELEC/ELEC PUMP/NORM | 3801GX | AB03 |