DOC AIRBUS | AMM A320FRemoval of the TRAS Locking Actuator [PW11]
TASK 78-31-03-000-801-A
Removal of the TRAS Locking Actuator
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 78-31-03-941-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:31:08 UTC
Removal of the TRAS Locking Actuator
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
WARNING:
WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
CAUTION:
HYDRAULIC FLUID CAN CAUSE DAMAGE TO EQUIPMENT. IF HYDRAULIC FLUID FALLS ON A SURFACE, IMMEDIATELY CLEAN THE SURFACE WITH A CLEAN CLOTH.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | CAP - PROTECTION |
| No specific | 1 | CONTAINER 5 L (1.32 USGAL) |
| No specific | AR | COVER - PROTECTION |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.PU1-0001) | lint-free cotton cloth |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1) | |
| 437AL, 438AR, 451BL, 452BR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2) | |
| 447AL, 448AR, 461BL, 462BR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-00-00-860-832-A | Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC |
| TASK 71-13-00-010-802-A | Opening of the Fan Cowl Doors |
| TASK 78-30-00-040-805-A | Deactivation of the Thrust Reverser System for Ground Maintenance |
| TASK 78-31-05-000-801-A | Removal of the Manual Drive Unit (MDU) |
| TASK 78-31-07-000-801-A | Removal of the Flex Shaft |
| TASK 78-31-50-000-801-A | Removal of the TRAS Hydraulic Tubes and Hoses |
| TASK 78-31-61-000-811-A | Removal of the Left TRAS Monitoring Harness |
| TASK 78-31-61-000-812-A | Removal of the Right TRAS Monitoring Harness |
| TASK 78-32-00-860-802-A | Manual Extension of the Thrust-Reverser Translating Sleeves |
| TASK 78-32-34-000-802-A | Removal of the Left Translating Sleeve Access Panels |
| TASK 78-32-64-000-802-A | Removal of the Right Translating Sleeve Access Panels |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1) | |
| TASK 29-10-00-864-001-A | Depressurize the Green Hydraulic System |
| TASK 29-14-00-614-001-A | Depressurization of the Hydraulic Reservoirs |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2) | |
| TASK 29-10-00-864-002-A | Depressurize the Yellow Hydraulic System |
| TASK 29-14-00-614-001-A | Depressurization of the Hydraulic Reservoirs |
TRAS Locking ActuatorSubtask 78-31-03-941-050-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) Do the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832)
Subtask 78-31-03-010-050-A ** ON A/C NOT FOR ALL (1) Do the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832)
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
Subtask 78-31-03-864-050-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
C. Depressurization of the Hydraulic System
(a) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(b) Depressurize the reservoir of the Green hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(a) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(b) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
Subtask 78-31-03-040-050-A ** ON A/C NOT FOR ALL WARNING:
MAKE SURE YOU DEPRESSURIZED THE HYDRAULIC SYSTEM. IF YOU LOOSEN A HYDRAULIC TUBE FITTING WHEN THERE IS PRESSURE IN THE HYDRAULIC SYSTEM, YOU CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)(a) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(b) Depressurize the reservoir of the Green hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(a) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(b) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
D. Deactivation of the Thrust Reverser for Maintenance
Subtask 78-31-03-010-051-A ** ON A/C NOT FOR ALL WARNING:
YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805). E. Get Access to the TRAS Locking Actuator.
(1) Remove the lower translating sleeve access panels (Ref. AMM TASK 78-32-34-000-802) (Ref. AMM TASK 78-32-64-000-802).
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451BL 452BR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461BL 462BR
4. Procedure(1) Remove the lower translating sleeve access panels (Ref. AMM TASK 78-32-34-000-802) (Ref. AMM TASK 78-32-64-000-802).
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451BL 452BR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461BL 462BR
CAUTION:
WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
Subtask 78-31-03-020-050-A ** ON A/C NOT FOR ALL A. Removal of the TRAS Locking Actuator
(2) Remove the bolt (2) and the bushing (3) that attach the locking actuator (1) to the translating sleeve fitting.
(3) Disconnect the TRAS monitoring harness from the locking actuator (1).
(a) For the left locking actuator, disconnect the left TRAS monitoring harnesses (4034KS-A) and (4042KS-A) from the locking actuator (1) (Ref. AMM TASK 78-31-61-000-811).
(b) For the right locking actuator, disconnect the right TRAS monitoring harnesses (4035KS-A) and (4043KS-A) from the locking actuator (1) (Ref. AMM TASK 78-31-61-000-812).
(4) Install CAP - PROTECTION on the TRAS monitoring harness connectors and COVER - PROTECTION locking actuator (1).
(5) Remove the bolt (15) and the washers (12) and (13) that attach the grounding strap (14) to the locking actuator (1).
(6) Put the CONTAINER 5 L (1.32 USGAL) below the locking actuator (1) to collect the remaining hydraulic fluid.
(7) Remove the deploy tube and flexible drive shaft from the locking actuator (1) (Ref. AMM TASK 78-31-07-000-801).
(8) Remove the clamps, clamp assemblies and hardware, as necessary, to give clearance when you disconnect the deploy tube.
(9) Disconnect the deploy tube and flexible drive shaft from the locking actuator (1).
(10) Safety the flexible drive shaft to the deploy tube.
(11) Remove the Manual Drive Unit (MDU) from the locking actuator (1) (Ref. AMM TASK 78-31-05-000-801).
(12) Remove the clamps and hardware, as necessary, to give clearance when you disconnect the hydraulic tubes (Ref. AMM TASK 78-31-50-000-801).
(13) Disconnect the stow tube and the return tube from the locking actuator (1).
(14) Disconnect the track lock return tube and the track lock valve supply tube from the locking actuator (1).
(15) Remove the four bolts (8) and the four washers (9) that attach the two gimbal pin retainers (10) to the TRAS fitting.
(16) Remove the two gimbal pin retainers (10) from the TRAS fitting.
(17) Remove the two gimbal pins (11) from the TRAS fitting and the locking actuator (1).
(18) Move the locking actuator (1) as follows:
(20) Carefully, remove the locking actuator (1) and the actuator seal (16) from the thrust reverser.
(21) Remove the actuator seal (16) from the locking actuator (1).
(22) Measure and record the length of the locking actuator (1) for installation.
(23) Installation of the protection covers
NOTE: These procedures are for the left TRAS locking actuator. The right is opposite.
(1) Manually extend the applicable translating sleeve to approximately 3 in. (76.20 mm) (Ref. AMM TASK 78-32-00-860-802). (2) Remove the bolt (2) and the bushing (3) that attach the locking actuator (1) to the translating sleeve fitting.
(3) Disconnect the TRAS monitoring harness from the locking actuator (1).
(a) For the left locking actuator, disconnect the left TRAS monitoring harnesses (4034KS-A) and (4042KS-A) from the locking actuator (1) (Ref. AMM TASK 78-31-61-000-811).
(b) For the right locking actuator, disconnect the right TRAS monitoring harnesses (4035KS-A) and (4043KS-A) from the locking actuator (1) (Ref. AMM TASK 78-31-61-000-812).
(4) Install CAP - PROTECTION on the TRAS monitoring harness connectors and COVER - PROTECTION locking actuator (1).
(5) Remove the bolt (15) and the washers (12) and (13) that attach the grounding strap (14) to the locking actuator (1).
(6) Put the CONTAINER 5 L (1.32 USGAL) below the locking actuator (1) to collect the remaining hydraulic fluid.
(7) Remove the deploy tube and flexible drive shaft from the locking actuator (1) (Ref. AMM TASK 78-31-07-000-801).
(8) Remove the clamps, clamp assemblies and hardware, as necessary, to give clearance when you disconnect the deploy tube.
(9) Disconnect the deploy tube and flexible drive shaft from the locking actuator (1).
(10) Safety the flexible drive shaft to the deploy tube.
CAUTION:
DO NOT LET THE FLEX SHAFT FALL OUT OF THE DEPLOY TUBE. IF YOU DO, DAMAGE TO THE FLEX SHAFT CAN OCCUR.
(a) Make sure that the flexible drive shaft does not fall out of the deploy tube. (11) Remove the Manual Drive Unit (MDU) from the locking actuator (1) (Ref. AMM TASK 78-31-05-000-801).
(12) Remove the clamps and hardware, as necessary, to give clearance when you disconnect the hydraulic tubes (Ref. AMM TASK 78-31-50-000-801).
(13) Disconnect the stow tube and the return tube from the locking actuator (1).
(14) Disconnect the track lock return tube and the track lock valve supply tube from the locking actuator (1).
(15) Remove the four bolts (8) and the four washers (9) that attach the two gimbal pin retainers (10) to the TRAS fitting.
(16) Remove the two gimbal pin retainers (10) from the TRAS fitting.
(17) Remove the two gimbal pins (11) from the TRAS fitting and the locking actuator (1).
(18) Move the locking actuator (1) as follows:
WARNING:
BE CAREFUL WHEN YOU REMOVE THE HYDRAULIC LOCKING ACTUATOR. THE HYDRAULIC LOCKING ACTUATOR CAN CONTAIN HYDRAULIC FLUID.
(a) Carefully move the locking actuator (1) and the actuator seal (16) forward a few inches from the TRAS fitting. NOTE: If hydraulic fluid comes out of the actuator, collect the leakage in a CONTAINER 5 L (1.32 USGAL) or a lint-free cotton cloth (Material No.PU1-0001) .
(19) Turn the locking actuator (1) approximately 90 degrees until the rod end of the locking actuator (1) can fit through the cascade ring bumper. (20) Carefully, remove the locking actuator (1) and the actuator seal (16) from the thrust reverser.
(21) Remove the actuator seal (16) from the locking actuator (1).
(22) Measure and record the length of the locking actuator (1) for installation.
(23) Installation of the protection covers
CAUTION:
INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.
(a) Make sure that you install COVER - PROTECTION on the locking actuator (1), MDU, stow tube, return tube, track lock return tube and track lock valve supply tube as necessary to prevent damage to the engine.