DOC AIRBUS | AMM A320FRemoval of the TRAS Locking-Feedback Actuator [PW11]
TASK 78-31-04-000-801-A
Removal of the TRAS Locking-Feedback 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 78-31-04-941-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:31:11 UTC
Removal of the TRAS Locking-Feedback 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:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
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.
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 | 1 | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| 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, 451CL | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2) | |
| 447AL, 448AR, 461BL, 461CL | |
| 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 78-31-07-000-801-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 Feedback Actuator - Locked and Unlocked PositionsSubtask 78-31-04-941-050-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 78-31-04-010-050-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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 78-31-04-864-050-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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
C. Depressurization of the Hydraulic System
(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).
Subtask 78-31-04-040-050-A ** ON A/C NOT FOR ALL (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 ground Maintenance
Subtask 78-31-04-010-051-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-Feedback Actuator
(1) Remove the left or right upper translating-sleeve access panel (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 451CL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461BL 461CL
4. Procedure(1) Remove the left or right upper translating-sleeve access panel (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 451CL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461BL 461CL
CAUTION:
WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
Subtask 78-31-04-020-050-A ** ON A/C NOT FOR ALL A. Removal of the TRAS Locking-Feedback Actuator
(1) Manually extend the left translating sleeve to approximately 3 in. (76.20 mm) (Ref. AMM TASK 78-32-00-860-802).
(2) Remove the left TRAS locking feedback actuator (1).
(a) Remove the bolt (2) and the bushing (3) that attach the left locking feedback actuator (1) to the translating sleeve fitting.
(b) Disconnect the left TRAS monitoring harness (4003KS-A), (4032KS-A) and (4040KS-A) from the left locking feedback actuator (1) (Ref. AMM TASK 78-31-61-000-811).
(c) Install COVER - PROTECTION on the left TRAS monitoring harness connectors and left locking feedback actuator (1).
(d) Remove the two bolts (5) and the two washers (4) that attach the actuator bracket and the left TRAS monitoring harness to the left locking feedback actuator (1).
(e) Remove the actuator bracket and the left TRAS monitoring harness from the left locking feedback actuator (1).
(f) Put a CONTAINER 5 L (1.32 USGAL) under the left locking feedback actuator (1) to collect the remaining hydraulic fluid.
(g) Remove the deploy tube and flexible drive shaft from the left locking feedback actuator (1) (Ref. AMM TASK 78-31-07-000-801).
1 Remove the clamps, clamp assemblies and hardware, as necessary, to give clearance when you disconnect the deploy tube.
2 Disconnection of the deploy tube and flexible drive shaft.
3 Safety the flexible drive shaft to the deploy tube. Make sure that the flexible drive shaft does not fall out of the deploy tube.
(h) Remove the nearest clamps and hardware, as necessary, to give clearance when you disconnect the hydraulic tubes (Ref. AMM TASK 78-31-50-000-801).
(i) Disconnect the left stow hose, the left deploy hose and the left return hose from the left locking feedback actuator (1). Drain the hydraulic fluid into the CONTAINER 5 L (1.32 USGAL).
(j) Disconnect the left return tube and the left stow tube from the left locking feedback actuator (1). Drain the hydraulic fluid into the CONTAINER 5 L (1.32 USGAL).
(k) Remove the bolt (12) and the washers (13) and (14) that attach the grounding strap (11) to the left locking feedback actuator (1).
(l) Remove the grounding strap (11) from the left locking feedback actuator (1).
(m) Remove the four bolts (15) and the four washers (16) that attach the two gimbal pin retainers (17) to the TRAS fitting.
(n) Remove the two gimbal pin retainers (17) from the TRAS fitting.
(o) Remove the two gimbal pins (18) from the TRAS fitting and the left locking feedback actuator (1).
(p) Move the left locking feedback actuator (1) as follows:
(r) Carefully, remove the left locking feedback actuator (1) and the actuator seal (19) from the thrust reverser.
(s) Remove the actuator seal (19) from the left locking feedback actuator (1).
(t) Install COVER - PROTECTION on the locking feedback actuator (1), left stow hose, left deploy hose, left return hose, left return tube and left stow tube.
(u) Measure and record the length of the left locking feedback actuator (1) for installation.
(3) Remove the right TRAS locking feedback actuator (20).
(a) Manually extend the right translating sleeve to approximately 3 in. (76.20 mm) (Ref. AMM TASK 78-32-00-860-802).
(b) Remove the bolt (21) and bushing (22) that attach the right locking feedback actuator (20) to the translating sleeve fitting.
(c) Disconnect the right TRAS monitoring harness (4004KS-A), (4033KS-A) and (4041KS-A) from the right locking feedback actuator (20) (Ref. AMM TASK 78-31-61-000-812).
(d) Remove the two bolts (23) and the two washers (24) that attach the two actuator brackets and the right TRAS monitoring harness to the right locking feedback actuator (20).
(e) Put a CONTAINER 5 L (1.32 USGAL) under the right locking feedback actuator (20) to collect the remaining hydraulic fluid.
(f) Remove the deploy tube and flexible drive shaft from the right locking feedback actuator (20) (Ref. AMM TASK 78-31-07-000-801).
1 Remove the clamps, clamp assemblies and hardware, as necessary, to give clearance when you disconnect the deploy tube.
2 Disconnection of the deploy tube and flexible drive shaft.
3 Safety the flexible drive shaft to the deploy tube. Make sure that the flexible drive shaft does not fall out of the deploy tube.
(g) Remove the nearest clamps and hardware, as necessary, to give clearance when you disconnect the hydraulic tubes (Ref. AMM TASK 78-31-50-000-801).
(h) Disconnect the right stow hose, right deploy hose and right return hose from the right locking feedback actuator (20).
(i) Disconnect the right stow tube and right return tube from the right locking feedback actuator (20).
(j) Remove the bolt (29) and the two washers (30) and (31) that attach the grounding strap (28) to the right locking feedback actuator (20).
(k) Remove the grounding strap (28) from the locking feedback actuator (20).
(l) Remove the four bolts (37) and the four washers (36) that attach the two gimbal pin retainers (35) to the TRAS fitting.
(m) Remove the two gimbal pin retainers (35) from the TRAS fitting.
(n) Remove the two gimbal pins (34) from the TRAS fitting and the right locking feedback actuator (20).
(o) Move the right locking feedback actuator as follows:
(r) Carefully, remove the right locking feedback actuator (20) and the actuator seal (38) from the thrust reverser.
(s) Remove the actuator seal (38) from the right locking feedback actuator (20).
(t) Install COVER - PROTECTION on the right locking feedback actuator (20), right stow hose, right deploy hose, right return hose, right return tube and right stow tube.
(u) Measure and record the length of the right locking feedback actuator (20) for installation.
(1) Manually extend the left translating sleeve to approximately 3 in. (76.20 mm) (Ref. AMM TASK 78-32-00-860-802).
(2) Remove the left TRAS locking feedback actuator (1).
(a) Remove the bolt (2) and the bushing (3) that attach the left locking feedback actuator (1) to the translating sleeve fitting.
(b) Disconnect the left TRAS monitoring harness (4003KS-A), (4032KS-A) and (4040KS-A) from the left locking feedback actuator (1) (Ref. AMM TASK 78-31-61-000-811).
(c) Install COVER - PROTECTION on the left TRAS monitoring harness connectors and left locking feedback actuator (1).
(d) Remove the two bolts (5) and the two washers (4) that attach the actuator bracket and the left TRAS monitoring harness to the left locking feedback actuator (1).
(e) Remove the actuator bracket and the left TRAS monitoring harness from the left locking feedback actuator (1).
(f) Put a CONTAINER 5 L (1.32 USGAL) under the left locking feedback actuator (1) to collect the remaining hydraulic fluid.
(g) Remove the deploy tube and flexible drive shaft from the left locking feedback actuator (1) (Ref. AMM TASK 78-31-07-000-801).
1 Remove the clamps, clamp assemblies and hardware, as necessary, to give clearance when you disconnect the deploy tube.
2 Disconnection of the deploy tube and flexible drive shaft.
CAUTION:
DO NOT LET THE FLEX SHAFT FALL OUT OF THE DEPLOY TUBE. IF YOU DO, DAMAGE TO THE FLEX SHAFT CAN OCCUR.
a Disconnect the deploy tube and flexible drive shaft from the left locking actuator (1). 3 Safety the flexible drive shaft to the deploy tube. Make sure that the flexible drive shaft does not fall out of the deploy tube.
(h) Remove the nearest clamps and hardware, as necessary, to give clearance when you disconnect the hydraulic tubes (Ref. AMM TASK 78-31-50-000-801).
(i) Disconnect the left stow hose, the left deploy hose and the left return hose from the left locking feedback actuator (1). Drain the hydraulic fluid into the CONTAINER 5 L (1.32 USGAL).
(j) Disconnect the left return tube and the left stow tube from the left locking feedback actuator (1). Drain the hydraulic fluid into the CONTAINER 5 L (1.32 USGAL).
(k) Remove the bolt (12) and the washers (13) and (14) that attach the grounding strap (11) to the left locking feedback actuator (1).
(l) Remove the grounding strap (11) from the left locking feedback actuator (1).
(m) Remove the four bolts (15) and the four washers (16) that attach the two gimbal pin retainers (17) to the TRAS fitting.
(n) Remove the two gimbal pin retainers (17) from the TRAS fitting.
(o) Remove the two gimbal pins (18) from the TRAS fitting and the left locking feedback actuator (1).
(p) Move the left locking feedback actuator (1) as follows:
WARNING:
BE CAREFUL WHEN YOU REMOVE THE LOCKING FEEDBACK ACTUATOR. THE LOCKING FEEDBACK ACTUATOR CAN CONTAIN HYDRAULIC FLUID.
1 Carefully move the left locking feedback actuator (1) and the actuator seal (19) 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) .
(q) Turn the left locking feedback actuator (1) approximately 90 degrees until the rod end of the left locking feedback actuator (1) can fit through the cascade ring bumper. (r) Carefully, remove the left locking feedback actuator (1) and the actuator seal (19) from the thrust reverser.
(s) Remove the actuator seal (19) from the left locking feedback actuator (1).
(t) Install COVER - PROTECTION on the locking feedback actuator (1), left stow hose, left deploy hose, left return hose, left return tube and left stow tube.
(u) Measure and record the length of the left locking feedback actuator (1) for installation.
(3) Remove the right TRAS locking feedback actuator (20).
(a) Manually extend the right translating sleeve to approximately 3 in. (76.20 mm) (Ref. AMM TASK 78-32-00-860-802).
(b) Remove the bolt (21) and bushing (22) that attach the right locking feedback actuator (20) to the translating sleeve fitting.
(c) Disconnect the right TRAS monitoring harness (4004KS-A), (4033KS-A) and (4041KS-A) from the right locking feedback actuator (20) (Ref. AMM TASK 78-31-61-000-812).
(d) Remove the two bolts (23) and the two washers (24) that attach the two actuator brackets and the right TRAS monitoring harness to the right locking feedback actuator (20).
(e) Put a CONTAINER 5 L (1.32 USGAL) under the right locking feedback actuator (20) to collect the remaining hydraulic fluid.
(f) Remove the deploy tube and flexible drive shaft from the right locking feedback actuator (20) (Ref. AMM TASK 78-31-07-000-801).
1 Remove the clamps, clamp assemblies and hardware, as necessary, to give clearance when you disconnect the deploy tube.
2 Disconnection of the deploy tube and flexible drive shaft.
CAUTION:
DO NOT LET THE FLEX SHAFT FALL OUT OF THE DEPLOY TUBE. IF YOU DO, DAMAGE TO THE FLEX SHAFT CAN OCCUR.
a Disconnect the deploy tube and flexible drive shaft from the right locking feedback actuator (20). 3 Safety the flexible drive shaft to the deploy tube. Make sure that the flexible drive shaft does not fall out of the deploy tube.
(g) Remove the nearest clamps and hardware, as necessary, to give clearance when you disconnect the hydraulic tubes (Ref. AMM TASK 78-31-50-000-801).
(h) Disconnect the right stow hose, right deploy hose and right return hose from the right locking feedback actuator (20).
(i) Disconnect the right stow tube and right return tube from the right locking feedback actuator (20).
(j) Remove the bolt (29) and the two washers (30) and (31) that attach the grounding strap (28) to the right locking feedback actuator (20).
(k) Remove the grounding strap (28) from the locking feedback actuator (20).
(l) Remove the four bolts (37) and the four washers (36) that attach the two gimbal pin retainers (35) to the TRAS fitting.
(m) Remove the two gimbal pin retainers (35) from the TRAS fitting.
(n) Remove the two gimbal pins (34) from the TRAS fitting and the right locking feedback actuator (20).
(o) Move the right locking feedback actuator as follows:
WARNING:
BE CAREFUL WHEN YOU REMOVE THE LOCKING FEEDBACK ACTUATOR. THE LOCKING FEEDBACK ACTUATOR CAN CONTAIN HYDRAULIC FLUID.
(p) Carefully move the right locking feedback actuator (20) and the actuator seal (38) 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) .
(q) Turn the right locking feedback actuator (20) approximately 90 degrees until the rod end of the right locking feedback actuator (20) can fit through the cascade ring bumper. (r) Carefully, remove the right locking feedback actuator (20) and the actuator seal (38) from the thrust reverser.
(s) Remove the actuator seal (38) from the right locking feedback actuator (20).
(t) Install COVER - PROTECTION on the right locking feedback actuator (20), right stow hose, right deploy hose, right return hose, right return tube and right stow tube.
(u) Measure and record the length of the right locking feedback actuator (20) for installation.