W DOC AIRBUS | AMM A320F

Removal of the Green/Yellow Power Transfer Unit

TASK 29-23-41-000-001-A
Removal of the Green/Yellow Power Transfer Unit

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
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.
FIN: 1088GM
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific
AR
CAP - BLANKING
No specific
1
CONTAINER - HYDRAULIC FLUID RESISTANT
No specific
AR
PLUG - BLANKING
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
3
WARNING NOTICE(S)
 B. Referenced Information
REFERENCE
DESIGNATION
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 29-00-00-910-003-A
General Removal and Installation Procedure of the Check Valves in the Hydraulic Systems
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 32-12-00-010-001-A
Open the Main Gear Doors for Access
F Green/Yellow Power Transfer Unit
3. Job Set-up
Subtask 29-23-41-860-050-A
A. Aircraft Maintenance Configuration
WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.
   (1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
   (2) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Green and Yellow hydraulic systems.
  • in the cockpit on the hydraulic section 40VU of the overhead panel,
  • on the ground service panel of the Green and Yellow hydraulic systems.
   (3) Make sure that the Green and Yellow hydraulic systems are depressurized and put them in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
   (4) Depressurize the reservoirs of the Green and Yellow hydraulic systems (Ref. AMM TASK 29-14-00-614-001).
   (5) Open the left and right main landing gear doors (Ref. AMM TASK 32-12-00-010-001).
   (6) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
   (7) Put a CONTAINER - HYDRAULIC FLUID RESISTANT under the hydraulic connections of the power transfer unit.
   (8) Disconnect the isolation coupling of the power transfer unit (PTU) (Ref. AMM TASK 29-23-00-860-001).
Subtask 29-23-41-865-051-A
B. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUHYD/HYD PWR/B WARN/& CTL2702GJC12
** ON A/C NOT FOR ALL
49VUHYDRAULIC/G HYD/PUMP ENG1/CTL1701GKH12
** ON A/C NOT FOR ALL
121VUHYDRAULIC/G HYD/PUMP ENG1/CTL1701GKR35
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN30
121VUHYDRAULIC/G HYD/PUMP ENG1/MONG1702GKR34
** ON A/C ALL
121VUHYDRAULIC/Y HYD/PUMP ENG2/CTL3701GDQ36
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN31
121VUHYDRAULIC/G HYD/PUMP ENG1/MONG1702GKR33
** ON A/C ALL
123VUB HYD/ELEC PUMP2701GJAB09
123VUY HYD/ELEC/PUMP3802GXAB06
123VUY HYD/ELEC/ELEC PUMP/NORM3801GXAB03
4. Procedure
Subtask 29-23-41-210-051-A
A. Preparation for Removal
NOTE: This procedure is only applicable, if you did not do a check of the low pressure check-valves during the troubleshooting procedure.
   (1) In open position, visually examine the low pressure check-valves that follow for contamination, damage and blockage:
  • For Green hydraulic system, examine check valves 1019GM and 1020GM.
  • For Yellow hydraulic system, examine check valves 3019GM and 3020GM.
     (a) If necessary, replace the applicable check valve (Ref. AMM TASK 29-00-00-910-003).
Subtask 29-23-41-020-050-C
B. Removal of the Power Transfer Unit
CAUTION: 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) Loosen the union nut (1) from the case drain port (17) of the Yellow hydraulic system and remove the hose.
   (2) Loosen the union nut (2) from the case drain port (18) of the Green hydraulic system and remove the hose.
   (3) Loosen the union nut (3) from the HP port (6) of the Green hydraulic system and remove the hose
   (4) Disconnect the self-sealing coupling (4) from the LP port (5) of the Green hydraulic system and remove the hose.
   (5) Disconnect the self-sealing coupling (14) from the LP port (13) of the Yellow hydraulic system.
   (6) Loosen the union nut (16) from the HP port (15) of the Yellow hydraulic system and remove the hose.
   (7) Loosen the union nut (9) from the seal drain port (10) and remove the hose.
   (8) Put the PLUG-BLANKING in each disconnected line end.
   (9) Put a CAP - BLANKING on the ports of the power transfer unit (7).
   (10) Remove the nut (20), the screw (21), the washer (22) and the bonding strap (19).
   (11) Cut, remove and discard the lockwire from the bolts (12).
   (12) Remove the bolts (12) and the washers (11).
NOTE: Make sure that the shock mounts do not turn when you remove the bolts (12).
   (13) Remove the power transfer unit (7) from the support plate (8).
   (14) Remove the spacers (23).
[Rev.10 from 2021] 2026.04.01 00:26:47 UTC
"Aviabrain" 2025