DOC AIRBUS | AMM A320FManually Stow the Translating Cowl [CFML]
TASK 78-32-50-410-801-A
Manually Stow the Translating Cowl
This task gives the instructions to manually stow the translating cowl (transcowl).
Opening and closing of the transcowl are maintenance procedures done while the aircraft is on the ground. This TASK moves the transcowl manually, not with the thrust reverser actuation system used during automatic operation.
When the transcowl is open, it is in the aft position which is known as the deployed position. When the transcowl is closed, it is in the forward position which is known as the stowed position.
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 78-32-50-941-052-A
Subtask 78-32-50-420-051-A
Subtask 78-32-50-440-052-A
[Rev.10 from 2021]
2026.04.01 03:36:27 UTC
Manually Stow the Translating Cowl
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.
CAUTION:
MAKE SURE THAT THE THRUST REVERSER COWL DOORS ARE CLOSED BEFORE YOU DO A THRUST REVERSER CYCLING TEST. IF THE THRUST REVERSER COWL DOORS ARE OPEN, DAMAGE TO THE AIRCRAFT AND EQUIPMENT CAN OCCUR.
ZONE: 400
1. Reason for the JobThis task gives the instructions to manually stow the translating cowl (transcowl).
Opening and closing of the transcowl are maintenance procedures done while the aircraft is on the ground. This TASK moves the transcowl manually, not with the thrust reverser actuation system used during automatic operation.
When the transcowl is open, it is in the aft position which is known as the deployed position. When the transcowl is closed, it is in the forward position which is known as the stowed position.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE |
| No specific | 1 | DRILL - HAND |
| No specific | 1 | INSPECTION CREEPER |
| No specific | AR | WARNING NOTICE(S) |
| No specific | 1 | WRENCH - SPEED, SQUARE DRIVE |
| 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 29-14-00-720-001-A | Functional Test of the Pressurizing System of the Hydraulic Reservoirs |
| TASK 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-803-A | Closing of the Fan Cowl Doors |
| TASK 73-29-00-740-804-A | Thrust Reverser Cycling Test (Menu Mode) |
| TASK 78-30-00-040-807-A | Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU) |
| TASK 78-30-00-440-807-A | Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU) |
| TASK 78-31-43-040-802-A | Locking of the Right Lower Actuator (Synchronized Manual Locking Actuator) |
| TASK 78-31-43-440-802-A | Unlocking of the Right Lower Actuator (Synchronized Manual Locking Actuator) |
| TASK 78-37-00-040-803-A | Deactivation of the Electrical Tertiary Lock System |
| TASK 78-37-00-440-803-A | Activation of the Electrical Tertiary Lock System |
Manually Deploying and Manually Stowing of the Translating CowlSubtask 78-32-50-941-052-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) Make sure that the WARNING NOTICE(S) are 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) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).
Subtask 78-32-50-010-054-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) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:
- The ENG/MODE selector switch, and
- 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) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).
B. Get Access
(1) Make sure that the fan cowl doors are open (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 78-32-50-040-053-A (1) Make sure that the fan cowl doors are open (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 Maintenance
Subtask 78-32-50-040-055-A Subtask 78-32-50-720-051-A 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) Make sure that you did the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807). E. Make sure that you did a check of the pressurization of the related hydraulic reservoir (Ref. AMM TASK 29-14-00-720-001).
4. ProcedureNOTE: If the related hydraulic reservoir is pressurized, it is not necessary to do the bleed procedure after the manual stow operation. If the related hydraulic reservoir is not pressurized (or if you do not pressurize the related hydraulic reservoir), you must do the bleeding procedure after the manual stow operation.
Subtask 78-32-50-420-051-A
A. Manually Stow the Translating Cowl (transcowl)
(2) Put the INSPECTION CREEPER in position under the thrust reverser.
(3) Reactivate the tertiary lock (Ref. AMM TASK 78-37-00-440-803).
(4) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position on either side of the engine.
PRE SPOL BD-TR-17014 with 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS
(5) Remove the 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS from the left upper actuator.
END OF PRE SPOL BD-TR-17014 with 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS
POST SPOL BD-TR-17014 with 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS
(7) Remove the 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS from the left upper actuator.
END OF POST SPOL BD-TR-17014 with 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS
(9) Manually stow the transcowl as follows:
(a) Put the WRENCH - SPEED, SQUARE DRIVE 3/8 in. in the socket of the Manual Drive Unit (MDU). Make sure that the square drive of the speed wrench is fully engaged in the MDU.
(d) Put the WRENCH - SPEED, SQUARE DRIVE in the other MDU and turn it. When the transcowl gets to the fully stowed position, the MDU clutch will dis-engage and a repetitive clicking will be heard.
(e) Remove the WRENCH - SPEED, SQUARE DRIVE from the MDU.
(f) Visually check the position of the target at both upper actuators to confirm they are in locked position.
(10) Make the transcowl safe for maintenance as follows:
(b) When maintenance is complete, make sure the synchronized manual locking actuator (lower right actuator) (Ref. AMM TASK 78-31-43-440-802) is unlocked.
5. Close-upCAUTION:
DO NOT OPEN THE THRUST REVERSER WHEN THE TRANSLATING COWL IS DEPLOYED BY MORE THAN 10 INCHES (254 MM). DO NOT DEPLOY THE TRANSLATING COWL WHEN THE THRUST REVERSER IS OPEN. WHEN THE THRUST REVERSER IS OPEN IT CAN HIT THE WING IF THE TRANSLATING COWL IS MOVED TO THE DEPLOYED POSITION. THIS CAN CAUSE DAMAGE TO THE THRUST REVERSER AND THE WING.
(1) Unlock the synchronized manual locking actuator (right lower actuator) (Ref. AMM TASK 78-31-43-440-802). (2) Put the INSPECTION CREEPER in position under the thrust reverser.
(3) Reactivate the tertiary lock (Ref. AMM TASK 78-37-00-440-803).
(4) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position on either side of the engine.
PRE SPOL BD-TR-17014 with 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS
(5) Remove the 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS from the left upper actuator.
NOTE: Target will stay in unlocked position until transcowl is fully stowed.
(6) Remove the 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS from the right upper actuator. NOTE: Target will stay in unlocked position until transcowl is fully stowed.
END OF PRE SPOL BD-TR-17014 with 98N7830H025-000 WAVE - UNLOCKING TR UP. ACTUATORS
POST SPOL BD-TR-17014 with 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS
(7) Remove the 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS from the left upper actuator.
NOTE: Target will stay in unlocked position until transcowl is fully stowed.
(8) Remove the 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS from the right upper actuator. NOTE: Target will stay in unlocked position until transcowl is fully stowed.
END OF POST SPOL BD-TR-17014 with 98N7830H027-000 PIN - UNLOCKING TR UP. ACTUATORS
(9) Manually stow the transcowl as follows:
(a) Put the WRENCH - SPEED, SQUARE DRIVE 3/8 in. in the socket of the Manual Drive Unit (MDU). Make sure that the square drive of the speed wrench is fully engaged in the MDU.
NOTE: As an alternative, you can use a tool such as an electrical DRILL - HAND. Such a tool must not turn more than 400 rpm and must not apply more than a 0.5 m.daN (44.25 lbf.in) torque.
(b) Turn the WRENCH - SPEED, SQUARE DRIVE until the transcowl moves to the fully forward (stowed) position, or to the specified distance. NOTE: For some maintenance procedures, it could be necessary to only move the transcowl a specified distance.
(c) Remove the WRENCH - SPEED, SQUARE DRIVE from the MDU. (d) Put the WRENCH - SPEED, SQUARE DRIVE in the other MDU and turn it. When the transcowl gets to the fully stowed position, the MDU clutch will dis-engage and a repetitive clicking will be heard.
(e) Remove the WRENCH - SPEED, SQUARE DRIVE from the MDU.
(f) Visually check the position of the target at both upper actuators to confirm they are in locked position.
(10) Make the transcowl safe for maintenance as follows:
WARNING:
DO NOT DO MAINTENANCE WITH THE TRANSCOWL UNLOCKED. IF THE TRANSCOWL IS ACCIDENTALLY PUSHED WHEN THE TRANSCOWL IS UNLOCKED, THERE IS A RISK OF INJURY TO PERSONNEL.
(a) If you do maintenance with the transcowl not fully stowed, lock the synchronized manual locking actuator (lower right actuator) (Ref. AMM TASK 78-31-43-040-802). (b) When maintenance is complete, make sure the synchronized manual locking actuator (lower right actuator) (Ref. AMM TASK 78-31-43-440-802) is unlocked.
Subtask 78-32-50-440-052-A
A. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-807).
Subtask 78-32-50-440-051-A B. Return to Service Testing
(1) Remove the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE.
(2) Remove the INSPECTION CREEPER.
(3) Do the Thrust Reverse Cycling Test (Ref. AMM TASK 73-29-00-740-804).
Subtask 78-32-50-410-052-A (1) Remove the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE.
(2) Remove the INSPECTION CREEPER.
(3) Do the Thrust Reverse Cycling Test (Ref. AMM TASK 73-29-00-740-804).
C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).