DOC AIRBUS | AMM A320FBleeding Procedure of the Green Hydraulic System Upstream of the PTU
TASK 29-00-00-870-002-A
Bleeding Procedure of the Green Hydraulic System Upstream of the PTU
Do this procedure after maintenance of the Green hydraulic system upstream of the PTU.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 29-00-00-860-062-A
Subtask 29-00-00-870-052-A
Subtask 29-00-00-860-075-A
[Rev.10 from 2021]
2026.04.01 04:47:27 UTC
Bleeding Procedure of the Green Hydraulic System Upstream of the PTU
WARNING:
PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
WARNING:
MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
1. Reason for the JobDo this procedure after maintenance of the Green hydraulic system upstream of the PTU.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )  |
| 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 29-00-00-210-001-A | Check for Air in the Green/Blue/Yellow Hydraulic System |
| TASK 29-00-00-910-002-A | Safety Procedures of the Hydraulic System |
| TASK 29-14-00-614-002-A | Pressurization of the Hydraulic Reservoirs through the Ground Connector |
| TASK 29-14-00-614-002-A-01 | Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU) |
| TASK 32-12-00-010-001-A | Open the Main Gear Doors for Access |
| TASK 32-12-00-410-001-A | Close the Main Gear Doors after Access |
| TASK 29-00-00-870-001-A | Bleeding Procedure of the Green Hydraulic System Upstream of the Engine Pump (for corrective action) |
| TASK 29-00-00-870-003-A | Bleeding Procedure of the Green Hydraulic System Downstream of the Engine Pump (for corrective action) |
| TASK 29-23-00-00 | POWER TRANSFER - DESCRIPTION AND OPERATION |
Subtask 29-00-00-860-062-A
A. Aircraft Maintenance Configuration
(2) Make sure that the replaced component is correctly installed.
(3) Make sure that the hydraulic reservoir of the Green hydraulic system is pressurized. If necessary pressurize it (Ref. AMM TASK 29-14-00-614-002).
Subtask 29-00-00-010-060-A 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 replaced component is correctly installed.
(3) Make sure that the hydraulic reservoir of the Green hydraulic system is pressurized. If necessary pressurize it (Ref. AMM TASK 29-14-00-614-002).
Subtask 29-00-00-870-052-A
A. Bleeding Procedure of the Green Hydraulic System Upstream of the PTU
(2) Put a container under the Power Transfer Unit (PTU).
(3) Loosen the nut of the case drain hose of the PTU until the air (or hydraulic fluid mixed with air bubbles) comes out of the connection.
(4) Tighten the nut of the case drain hose when the hydraulic fluid flows freely.
(5) TORQUE the nut of the case drain hose to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft ).
(6) Do the check for Air in the Green hydraulic system (Ref. AMM TASK 29-00-00-210-001).
(a) If the check for air is not in the given limits, do the bleeding procedure again.
5. Close-upCAUTION:
USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL LOOSEN OR TIGHTEN THE UNION TOO MUCH.
(1) Identify the locations of the related components to do the bleeding procedure (Ref. AMM D/O 29-23-00-00). (2) Put a container under the Power Transfer Unit (PTU).
(3) Loosen the nut of the case drain hose of the PTU until the air (or hydraulic fluid mixed with air bubbles) comes out of the connection.
(4) Tighten the nut of the case drain hose when the hydraulic fluid flows freely.
(5) TORQUE the nut of the case drain hose to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )
. (6) Do the check for Air in the Green hydraulic system (Ref. AMM TASK 29-00-00-210-001).
(a) If the check for air is not in the given limits, do the bleeding procedure again.
NOTE: Do not do the bleeding procedure more than two times.
(b) If the result is not satisfactory after two bleeding cycles, you must: - do the bleeding procedure of the Green hydraulic system upstream of the engine pump (Ref. AMM TASK 29-00-00-870-001)
- do the bleeding procedure of the Green hydraulic system downstream of the engine pump (Ref. AMM TASK 29-00-00-870-003).
Subtask 29-00-00-860-075-A
A. Put the aircraft back to the serviceable condition.
(1) Remove the container.
(2) Make sure that the level of the hydraulic fluid in the reservoir of the Green hydraulic system is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(3) Make sure that the air pressure in the reservoir of the Green hydraulic system is not less than 50 psi (3.4474 bar). If necessary pressurize the reservoir (Ref. AMM TASK 29-14-00-614-002).
Subtask 29-00-00-410-061-A (1) Remove the container.
(2) Make sure that the level of the hydraulic fluid in the reservoir of the Green hydraulic system is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(3) Make sure that the air pressure in the reservoir of the Green hydraulic system is not less than 50 psi (3.4474 bar). If necessary pressurize the reservoir (Ref. AMM TASK 29-14-00-614-002).