DOC AIRBUS | AMM A320FDeactivation of the Thrust Reverser System for Ground Maintenance [CFML]
TASK 78-30-00-040-809-A
Deactivation of the Thrust Reverser System for Ground Maintenance
A. This task gives the instructions to lock the right lower actuator during engine maintenance. This actuator is also known as the synchronized manual locking actuator.
B. When the synchronized manual locking actuator is locked, it prevents operation of the translating cowl (transcowl) by a mechanical locking mechanism. You must lock the synchronized manual locking actuator as a safety precaution before you do core engine maintenance to prevent accidental operation of the translating cowl.
C. Use this task while the thrust reverser is open for engine maintenance, and while the translating cowl is fully stowed.
D. This task is only done during engine maintenance. When maintenance is complete, you must do the unlocking procedure. There is a different task to deactivate the thrust reverser on both engines for flight (Ref. AMM TASK 78-30-00-040-808).
E. There is a different task for deactivation of the thrust reverser for nacelle maintenance:
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 78-30-00-941-092-A
Subtask 78-30-00-040-076-A
[Rev.10 from 2021]
2026.04.01 05:57:58 UTC
Deactivation of the Thrust Reverser System for Ground Maintenance
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.
1. Reason for the JobA. This task gives the instructions to lock the right lower actuator during engine maintenance. This actuator is also known as the synchronized manual locking actuator.
B. When the synchronized manual locking actuator is locked, it prevents operation of the translating cowl (transcowl) by a mechanical locking mechanism. You must lock the synchronized manual locking actuator as a safety precaution before you do core engine maintenance to prevent accidental operation of the translating cowl.
C. Use this task while the thrust reverser is open for engine maintenance, and while the translating cowl is fully stowed.
D. This task is only done during engine maintenance. When maintenance is complete, you must do the unlocking procedure. There is a different task to deactivate the thrust reverser on both engines for flight (Ref. AMM TASK 78-30-00-040-808).
E. There is a different task for deactivation of the thrust reverser for nacelle maintenance:
- Deactivation of the thrust reverser for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807) deactivates the thrust reverser hydraulically and electrically. Use this task when it is necessary to manually stow and deploy the transcowl.
- Deactivation of the thrust reverser for engine maintenance (this task) only deactivates the thrust reverser mechanically.
- You can do both deactivation tasks to be very sure that the transcowl does not accidentally move during maintenance.
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | WARNING NOTICE(S) |
| No specific | 1 | WRENCH - STANDARD |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 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) |
Thrust Reverser for Ground MaintenanceSubtask 78-30-00-941-092-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 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 a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 78-30-00-010-098-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 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 a 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
4. Procedure(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 78-30-00-040-076-A
A. Deactivate the Thrust Reverser for Ground Maintenance
(2) Do the steps that follow if the handle:
(b) Turn the MDU (3) approximately 180 degrees in the deploy direction or in the stow direction.
(c) Pull the yellow lock handle (2) out. The synchronized manual locking actuator (1) is not locked until the handle (2) is at approximately 45 degrees from the axis of the synchronized manual locking actuator (1).
(d) Optional procedure:
CAUTION:
LOCK THE SYNCHRONIZED MANUAL LOCKING ACTUATOR BY HAND. IF YOU USE A TOOL, YOU CAN CAUSE DAMAGE TO THE SYNCHRONIZED MANUAL LOCKING ACTUATOR.
(1) Pull the yellow lock handle (2) up and away from the body of the synchronized manual locking actuator (1). Continue until the handle (2) stops at approximately 45 degrees from the axis of the synchronized manual locking actuator (1). (2) Do the steps that follow if the handle:
- Does not move from its initial position, or
- Stops at approximately 15 degrees from the axis of the synchronized manual locking actuator (1).
(b) Turn the MDU (3) approximately 180 degrees in the deploy direction or in the stow direction.
(c) Pull the yellow lock handle (2) out. The synchronized manual locking actuator (1) is not locked until the handle (2) is at approximately 45 degrees from the axis of the synchronized manual locking actuator (1).
(d) Optional procedure:
- You can make the thrust reverser unserviceable for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807). This deactivates the HTRAS electrically and hydraulically to give more protection against accidental movement of the transcowl during maintenance.