DOC AIRBUS | AMM A320FInstallation of the TRAS Actuator Proximity-Sensors [PW11]
TASK 78-31-20-400-801-A
Installation of the TRAS Actuator Proximity-Sensors
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 78-31-20-941-051-A ** ON A/C NOT FOR ALL
Subtask 78-31-20-420-050-A ** ON A/C NOT FOR ALL
Subtask 78-31-20-440-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:31:24 UTC
Installation of the TRAS Actuator Proximity-Sensors
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.
ZONE: 400
FIN: 4032KS ** ON A/C NOT FOR ALL
FIN: 4033KS ** ON A/C NOT FOR ALL
FIN: 4034KS ** ON A/C NOT FOR ALL
FIN: 4035KS ** ON A/C NOT FOR ALL
FIN: 4040KS ** ON A/C NOT FOR ALL
FIN: 4041KS ** ON A/C NOT FOR ALL
FIN: 4042KS ** ON A/C NOT FOR ALL
FIN: 4043KS ** ON A/C NOT FOR ALL
1. Reason for the JobFIN: 4032KS ** ON A/C NOT FOR ALL
FIN: 4033KS ** ON A/C NOT FOR ALL
FIN: 4034KS ** ON A/C NOT FOR ALL
FIN: 4035KS ** ON A/C NOT FOR ALL
FIN: 4040KS ** ON A/C NOT FOR ALL
FIN: 4041KS ** ON A/C NOT FOR ALL
FIN: 4042KS ** ON A/C NOT FOR ALL
FIN: 4043KS ** ON A/C NOT FOR ALL
Self 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 | AR | COVER - PROTECTION |
| No specific | Torque wrench: range to between 119 and 108 lbf.in (1.34 and 1.22 m.daN )  | |
| A708405 | 1 | PROX SENSOR R/I TOOL |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.PU5-0007) | anti-seize compound, zinc dust petrolatum |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1) | |
| 437AL, 438AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2) | |
| 447AL, 448AR | |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 4 | TAB WASHERS | EIPC 78-32-05-55-453 |
| 2 | TAB WASHERS | EIPC 78-32-05-55-523 |
| 4 | TAB WASHERS | EIPC 78-32-06-55-453 |
| 2 | TAB WASHERS | EIPC 78-32-06-55-523 |
| 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 71-13-00-410-802-A | Closing of the Fan Cowl Doors |
| TASK 73-25-34-400-802-A | Installation of the Engine Interface Unit (EIU) |
| TASK 78-30-00-040-805-A | Deactivation of the Thrust Reverser System for Ground Maintenance |
| TASK 78-30-00-440-805-A | Reactivation of the Thrust Reverser System after Ground Maintenance |
| TASK 78-31-00-710-805-A | Operational Test of Thrust Reverser with MCDU |
| TASK 78-31-00-710-805-A-01 | Thrust Reverser Cycling Test (Engine Running) |
| TASK 78-31-62-400-801-A | Installation of the Left TRAS Track Lock Harness |
| TASK 78-31-62-400-802-A | Installation of the Right TRAS Track Lock Harness |
TRAS Actuator Proximity SensorsSubtask 78-31-20-941-051-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) Make sure that you did 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 78-31-20-010-052-A ** ON A/C NOT FOR ALL (1) Make sure that you did 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) Make sure that the fan cowl doors are open (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) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
Subtask 78-31-20-040-051-A ** ON A/C NOT FOR ALL (1) Make sure that the fan cowl doors are open (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) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
C. Deactivation of the Thrust Reverser System for Maintenance
4. ProcedureWARNING:
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) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805). Subtask 78-31-20-420-050-A ** ON A/C NOT FOR ALL
A. Installation of the TRAS Actuator Proximity-Sensors
PU5-0007 anti-seize compound, zinc dust petrolatum
(b) Put the proximity sensors (6) on the feedback locking actuator. Make sure that the sensors (6) are correctly in the keyway on the feedback locking actuator.
(c)
(e) TORQUE the lock nuts (5) to between 119 and 108 lbf.in (1.34 and 1.22 m.daN ).
(f) Make sure the clearance to the targets is correct.
(g) (h) (i) Find the average distance of step (2)(g) and step (2)(h). Add the two distances and divide the sum by two.
(j) Make sure the average distance you calculated in step (2)(i) is between 0.8575 IN. (21.78 MM) and 0.8614 IN. (21.88 MM). If the distance is not within the limits, replace the feedback locking actuator or contact Collin Aerospace for disposition.
(k) (l) If necessary, tighten the lock nuts (5) more to adjust the position of the lock nuts (5). Do not loosen the lock nuts (5) to get the correct position.
(n) Examine the installation of the tab washers (4). Make sure that:
1 The location tab is in the location tab hole.
2 The anti-rotation tabs are bent and flush against the flat side of the lock nuts (5).
3 The anti-rotation tabs prevent the rotation of the lock nuts (5).
4 There are no sharp corners, nicks or cracks at the bend of the anti-rotation tabs.
5 There is no damage to surfaces or protective treatment of the lock nuts (5) or mating components.
(o) Remove the COVER - PROTECTION from the TRAS monitoring harness and the feedback locking actuator.
(p) Connection of the electrical connectors:
PU5-0007 anti-seize compound, zinc dust petrolatum
(b) Put the proximity sensors (3) on the locking actuator. Make sure that the sensors (3) are correctly in the keyway on the locking actuator.
(c) (d) If necessary, rotate the manual lock drive on the locking actuator to get access to the lock nuts (1).
(f) TORQUE the lock nuts (1) to between 119 and 108 lbf.in (1.34 and 1.22 m.daN ).
(g) Make sure the clearance to the targets is correct:
1 2 3 Find the average distance of step (3)(g)1_ and step (3)(g)2_. Add the two distances and divide the sum by two.
4 Make sure the average distance you calculated in step (3)(g)3_ is between 0.8575 in. (21.78 mm) and 0.8614 in. (21.88 mm). If the distance is not within the limits, replace the locking actuator or contact Collins Aerospace for disposition.
(h) (i) If necessary, tighten the lock nuts (1) more to adjust the position of the lock nuts (1). Do not loosen the lock nuts (1) to get the correct position.
(k) Examine the installation of the tab washers (2). Make sure that:
1 The location tab is in the location tab hole.
2 The anti-rotation tabs are bent and flush against the flat side of the lock nuts (1).
3 The anti-rotation tabs prevent the rotation of the lock nuts (1).
4 There are no sharp corners, nicks or cracks at the bend of the anti-rotation tabs.
5 There is no damage to surfaces or protective treatment of the lock nuts (1) or mating components.
(l) Remove the COVER - PROTECTION from the TRAS monitoring harness and the locking actuator.
(m) Connection of the electrical connectors:
(5) Make sure that the work area is clean and clear of tools and other items.
5. Close-upCAUTION:
WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
(1) Removal of protection covers: CAUTION:
REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.
(a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine. CAUTION:
MAKE SURE THAT THE SENSORS ARE CORRECTLY INSTALLED. IF A SENSOR BECOMES LOOSE AND CHANGES POSITION, THE RELATED THRUST REVERSER CAN OPERATE INCORRECTLY OR BECOME UNSERVICEABLE.
(2) Install the TRAS feedback-locking-actuator proximity-sensors as follows: NOTE: These procedures are for the TRAS proximity sensors on the left thrust reverser half. The TRAS proximity sensors on the right thrust reverser half are opposite.
(a) Apply (b) Put the proximity sensors (6) on the feedback locking actuator. Make sure that the sensors (6) are correctly in the keyway on the feedback locking actuator.
(c)
CAUTION:
MAKE SURE THAT YOU APPLY THE CORRECT TORQUE RANGE ON THE LOCK NUTS. IF YOU APPLY AN INCORRECT TORQUE, THERE IS A RISK THAT THE PROXIMITY SENSORS WILL OPERATE INCORRECTLY.
(d) Hold the proximity sensors (6) with the A708405 PROX SENSOR R/I TOOL. (e) TORQUE the lock nuts (5) to between 119 and 108 lbf.in (1.34 and 1.22 m.daN )
. (f) Make sure the clearance to the targets is correct.
(g) (h) (i) Find the average distance of step (2)(g) and step (2)(h). Add the two distances and divide the sum by two.
(j) Make sure the average distance you calculated in step (2)(i) is between 0.8575 IN. (21.78 MM) and 0.8614 IN. (21.88 MM). If the distance is not within the limits, replace the feedback locking actuator or contact Collin Aerospace for disposition.
(k) (l) If necessary, tighten the lock nuts (5) more to adjust the position of the lock nuts (5). Do not loosen the lock nuts (5) to get the correct position.
CAUTION:
WHEN YOU BEND THE ANTI-ROTATION TABS, BE CAREFUL NOT TO CAUSE DAMAGE TO THE PROXIMITY SENSORS OR THE ADJACENT COMPONENTS.
(m) Bend the anti-rotation tabs on the tab washers (4) to safety the lock nuts (5) with applicable pliers or a punch and hammer.(n) Examine the installation of the tab washers (4). Make sure that:
1 The location tab is in the location tab hole.
2 The anti-rotation tabs are bent and flush against the flat side of the lock nuts (5).
3 The anti-rotation tabs prevent the rotation of the lock nuts (5).
4 There are no sharp corners, nicks or cracks at the bend of the anti-rotation tabs.
5 There is no damage to surfaces or protective treatment of the lock nuts (5) or mating components.
(o) Remove the COVER - PROTECTION from the TRAS monitoring harness and the feedback locking actuator.
(p) Connection of the electrical connectors:
CAUTION:
MAKE SURE THAT THE ELECTRICAL CONNECTOR AND RECEPTACLE ARE CLEAN WHEN YOU CONNECT THEM. DIRTY CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.
CAUTION:
USE TEFLON-JAWED PLIERS TO LOOSEN/TIGHTEN ELECTRICAL CONNECTORS. DO NOT USE METAL-JAWED PLIERS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE ELECTRICAL CONNECTORS CAN OCCUR.
1 Connect the electrical connectors of the TRAS monitoring harness to the proximity sensors (6) (Ref. AMM TASK 78-31-62-400-801) and (Ref. AMM TASK 78-31-62-400-802). NOTE: For the left thrust reverser half, the FIN numbers for the connectors are 4032KS-A and 4040KS-A. For the right thrust reverser half, the FIN numbers for the connectors are 4033KS-A and 4041KS-A.
CAUTION:
MAKE SURE THAT THE SENSORS ARE CORRECTLY INSTALLED. IF A SENSOR BECOMES LOOSE AND CHANGES POSITION, THE RELATED THRUST REVERSER CAN OPERATE INCORRECTLY OR BECOME UNSERVICEABLE.
(3) Install the TRAS locking-actuator proximity-sensors as follows: NOTE: These procedures are for the TRAS proximity sensors on the left thrust reverser half. The TRAS proximity sensors on the right thrust reverser half are opposite.
(a) Apply (b) Put the proximity sensors (3) on the locking actuator. Make sure that the sensors (3) are correctly in the keyway on the locking actuator.
(c) (d) If necessary, rotate the manual lock drive on the locking actuator to get access to the lock nuts (1).
CAUTION:
MAKE SURE THAT YOU APPLY THE CORRECT TORQUE RANGE ON THE LOCK NUTS. IF YOU APPLY AN INCORRECT TORQUE, THERE IS A RISK THAT THE PROXIMITY SENSORS WILL OPERATE INCORRECTLY.
(e) Hold the proximity sensors (3) with the A708405 PROX SENSOR R/I TOOL. (f) TORQUE the lock nuts (1) to between 119 and 108 lbf.in (1.34 and 1.22 m.daN )
. (g) Make sure the clearance to the targets is correct:
1 2 3 Find the average distance of step (3)(g)1_ and step (3)(g)2_. Add the two distances and divide the sum by two.
4 Make sure the average distance you calculated in step (3)(g)3_ is between 0.8575 in. (21.78 mm) and 0.8614 in. (21.88 mm). If the distance is not within the limits, replace the locking actuator or contact Collins Aerospace for disposition.
(h) (i) If necessary, tighten the lock nuts (1) more to adjust the position of the lock nuts (1). Do not loosen the lock nuts (1) to get the correct position.
CAUTION:
WHEN YOU BEND THE ANTI-ROTATION TABS, BE CAREFUL NOT TO CAUSE SHOCK LOADING TO THE PROXIMITY SENSORS. IF YOU DO, DAMAGE TO THE PROXIMITY SENSORS CAN OCCUR.
(j) Bend the anti-rotation tabs on the tab washers (2) to safety the lock nuts (1) with applicable pliers or a punch and hammer.(k) Examine the installation of the tab washers (2). Make sure that:
1 The location tab is in the location tab hole.
2 The anti-rotation tabs are bent and flush against the flat side of the lock nuts (1).
3 The anti-rotation tabs prevent the rotation of the lock nuts (1).
4 There are no sharp corners, nicks or cracks at the bend of the anti-rotation tabs.
5 There is no damage to surfaces or protective treatment of the lock nuts (1) or mating components.
(l) Remove the COVER - PROTECTION from the TRAS monitoring harness and the locking actuator.
(m) Connection of the electrical connectors:
CAUTION:
MAKE SURE THAT THE ELECTRICAL CONNECTOR AND RECEPTACLE ARE CLEAN WHEN YOU CONNECT THEM. DIRTY CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.
CAUTION:
USE TEFLON-JAWED PLIERS TO LOOSEN/TIGHTEN ELECTRICAL CONNECTORS. DO NOT USE METAL-JAWED PLIERS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE ELECTRICAL CONNECTORS CAN OCCUR.
1 Connect the electrical connectors on the TRAS monitoring harness to the proximity-sensors (3) (Ref. AMM TASK 78-31-62-400-801) and (Ref. AMM TASK 78-31-62-400-802). NOTE: For the left thrust reverser half, the FIN numbers for the connectors are 4034KS-A and 4042KS-A. For the right thrust reverser half, the FIN numbers for the connectors are 4035KS-A and 4043KS-A.
(4) Installation of protection covers: CAUTION:
INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.
(a) Make sure that you install the COVER - PROTECTION as necessary to prevent damage to the engine. (5) Make sure that the work area is clean and clear of tools and other items.
Subtask 78-31-20-440-050-A ** ON A/C NOT FOR ALL
A. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 78-31-20-410-051-A ** ON A/C NOT FOR ALL B. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
(4) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802)
Subtask 78-31-20-710-050-A ** ON A/C NOT FOR ALL (1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
(4) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802)
C. Do the operational test of the thrust reverser with the Multipurpose Control and Display Unit (MCDU) (Ref. AMM TASK 78-31-00-710-805).