DOC AIRBUS | AMM A320FUnlocking of the Thrust-Reverser Upper Actuators [CFML]
TASK 78-31-41-040-802-A
Unlocking of the Thrust-Reverser Upper Actuators
A. This procedure gives the instructions on how to unlock the right upper actuator and the left upper actuator.
B. Do this procedure only during maintenance and only when specified by another task.
C. The two upper actuators are also known as the synchronized locking feedback actuators.
D. When the actuators are unlocked you can manually stow and deploy the translating cowl during maintenance. Do the procedure to lock the actuators after maintenance is complete before the aircraft is released for flight. Never permit flight with an actuator in the unlocked condition.
E. Number of mechanics required to perform task:
PRE SPOL BD-TR-17014
Two mechanics are necessary to unlock upper actuators without WAVE - UNLOCKING TR UP. ACTUATORS.
One mechanic is necessary to unlock upper actuators with WAVE - UNLOCKING TR UP. ACTUATORS.
END OF PRE SPOL BD-TR-17014
POST SPOL BD-TR-17014
Two mechanics are necessary to unlock upper actuators without PIN - UNLOCKING TR UP. ACTUATORS.
One mechanic is necessary to unlock upper actuators with PIN - UNLOCKING TR UP. ACTUATORS.
END OF POST SPOL BD-TR-17014
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 78-31-41-941-078-A
Subtask 78-31-41-040-080-A
[Rev.10 from 2021]
2026.04.01 03:35:02 UTC
Unlocking of the Thrust-Reverser Upper Actuators
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
ZONE: 400
1. Reason for the JobA. This procedure gives the instructions on how to unlock the right upper actuator and the left upper actuator.
B. Do this procedure only during maintenance and only when specified by another task.
C. The two upper actuators are also known as the synchronized locking feedback actuators.
D. When the actuators are unlocked you can manually stow and deploy the translating cowl during maintenance. Do the procedure to lock the actuators after maintenance is complete before the aircraft is released for flight. Never permit flight with an actuator in the unlocked condition.
E. Number of mechanics required to perform task:
PRE SPOL BD-TR-17014
Two mechanics are necessary to unlock upper actuators without WAVE - UNLOCKING TR UP. ACTUATORS.
One mechanic is necessary to unlock upper actuators with WAVE - UNLOCKING TR UP. ACTUATORS.
END OF PRE SPOL BD-TR-17014
POST SPOL BD-TR-17014
Two mechanics are necessary to unlock upper actuators without PIN - UNLOCKING TR UP. ACTUATORS.
One mechanic is necessary to unlock upper actuators with PIN - UNLOCKING TR UP. ACTUATORS.
END OF POST SPOL BD-TR-17014
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 2 | ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE |
| No specific | AR | WARNING NOTICE(S) |
| No specific | 1 | WRENCH - STANDARD |
| 98N7830H025-000 | 1 | WAVE - UNLOCKING TR UP. ACTUATORS |
| 98N7830H027-000 | 1 | PIN - UNLOCKING TR UP. ACTUATORS |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1) | |
| 437AL, 438AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2) | |
| 447AL, 448AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 78-30-00-040-807-A | Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU) |
Locking/Unlocking the Thrust-Reverser Upper ActuatorsSubtask 78-31-41-941-078-A
A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put the WARNING NOTICE(S) in position to tell persons not to operate:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 78-31-41-010-097-A (1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put the WARNING NOTICE(S) in position to tell persons not to operate:
- The ENG/MODE selector switch
- The ENG/MASTER 1(2) control switch.
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.
Subtask 78-31-41-040-081-A (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.
C. Deactivation of the Thrust Reverser System for Nacelle Maintenance
(2) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position below the fan cowl doors, immediately forward of each of the upper actuators.
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) Do the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807). (2) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position below the fan cowl doors, immediately forward of each of the upper actuators.
Subtask 78-31-41-040-080-A
A. Unlocking of the Thrust-Reverser Upper Actuators
(1) For PRE SPOL BD-TR-17014 without 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS and POST SPOL BD-TR-17014 without 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS:
(a) Use the WRENCH - STANDARD to turn the yellow hex (3) on the left upper actuator (4) in the clockwise (unlock) direction. One mechanic must continue to hold this actuator in the unlocked condition.
(b) Use the WRENCH - STANDARD to turn the yellow hex (3) on the right upper actuator in the clockwise (unlock) direction. A second mechanic must continue to hold this actuator in the unlocked condition.
(2) For PRE SPOL BD-TR-17014 with 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS:
(a) Use the WRENCH - STANDARD to turn the yellow hex (3) on the left upper actuator (4) in the clockwise (unlock) direction, then install the 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS to keep the actuator in the unlocked condition.
1 The torque applied on the hex (3) shall not exceed 11.9 m.N (105.31 lbf.in).
(b) Use the WRENCH - STANDARD to turn the yellow hex (3) on the right upper actuator (4) in the clockwise (unlock) direction, then install the 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS to keep the actuator in the unlocked condition.
(3) For POST SPOL BD-TR-17014 with 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS:
(a) Use the WRENCH - STANDARD to turn the yellow hex (3) on the left upper actuator (4) in the clockwise (unlock) direction, then install the 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS to keep the actuator in the unlocked condition.
1 The torque applied on the hex (3) shall not exceed 11.9 m.N (105.31 lbf.in).
(b) Use the WRENCH - STANDARD to turn the yellow hex (3) on the right upper actuator in the clockwise (unlock) direction, then install the 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS to keep the actuator in the unlocked condition.
(1) For PRE SPOL BD-TR-17014 without 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS and POST SPOL BD-TR-17014 without 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS:
(a) Use the WRENCH - STANDARD to turn the yellow hex (3) on the left upper actuator (4) in the clockwise (unlock) direction. One mechanic must continue to hold this actuator in the unlocked condition.
NOTE: When the actuator is in the unlocked condition, the target (2) will be away from the proximity sensors (1) and (5).
1 The torque applied on the hex (3) shall not exceed 11.9 m.N (105.31 lbf.in). (b) Use the WRENCH - STANDARD to turn the yellow hex (3) on the right upper actuator in the clockwise (unlock) direction. A second mechanic must continue to hold this actuator in the unlocked condition.
(2) For PRE SPOL BD-TR-17014 with 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS:
(a) Use the WRENCH - STANDARD to turn the yellow hex (3) on the left upper actuator (4) in the clockwise (unlock) direction, then install the 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS to keep the actuator in the unlocked condition.
1 The torque applied on the hex (3) shall not exceed 11.9 m.N (105.31 lbf.in).
(b) Use the WRENCH - STANDARD to turn the yellow hex (3) on the right upper actuator (4) in the clockwise (unlock) direction, then install the 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS to keep the actuator in the unlocked condition.
(3) For POST SPOL BD-TR-17014 with 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS:
(a) Use the WRENCH - STANDARD to turn the yellow hex (3) on the left upper actuator (4) in the clockwise (unlock) direction, then install the 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS to keep the actuator in the unlocked condition.
1 The torque applied on the hex (3) shall not exceed 11.9 m.N (105.31 lbf.in).
(b) Use the WRENCH - STANDARD to turn the yellow hex (3) on the right upper actuator in the clockwise (unlock) direction, then install the 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS to keep the actuator in the unlocked condition.