DOC AIRBUS | AMM A320FDeactivation of the Thrust Reverser System for Nacelle Maintenance (ICU) [CFML]
TASK 78-30-00-040-807-A
Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
A. This procedure gives the instructions to set the Isolation Control Unit (ICU) to the deactivated position. In the deactivated position the ICU prevents automatic operation of the thrust reverser in the stow direction and the deploy direction.
B. This inhibition procedure must be applied for maintenance on nacelle components.
C. When the ICU is in the deactivated position it prevents operation of the thrust reverser electrical and hydraulic systems. The ICU does not prevent manual operation of the thrust reverser.
D. Before flight you must make the thrust reverser serviceable after maintenance. There is a different procedure to make the thrust reverser deactivated for flight (Ref. AMM TASK 78-30-00-040-808-A).
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 78-30-00-941-088-A
Subtask 78-30-00-040-073-A
[Rev.10 from 2021]
2026.04.01 03:34:41 UTC
Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
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 procedure gives the instructions to set the Isolation Control Unit (ICU) to the deactivated position. In the deactivated position the ICU prevents automatic operation of the thrust reverser in the stow direction and the deploy direction.
B. This inhibition procedure must be applied for maintenance on nacelle components.
C. When the ICU is in the deactivated position it prevents operation of the thrust reverser electrical and hydraulic systems. The ICU does not prevent manual operation of the thrust reverser.
D. Before flight you must make the thrust reverser serviceable after maintenance. There is a different procedure to make the thrust reverser deactivated for flight (Ref. AMM TASK 78-30-00-040-808-A).
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 | WARNING NOTICE(S) |
| 98N7830H001-000 | 1 | T/R INHIBITION KIT |
| 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 |
Deactivation-Reactivation of the Thrust ReverserSubtask 78-30-00-941-088-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 78-30-00-010-094-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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position under the left fan cowl door.
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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position under the left fan cowl door.
Subtask 78-30-00-040-073-A
A. Deactivation of the Thrust Reverser for Maintenance
(1) Remove the tethered pin (3) from aft hole (5) of the inhibit lever (1).
(2) Move the inhibit lever (1) against the inhibit plunger (4).
(3) Check that "ICU INHBITED" is now visible.
(4) Install the 98N7830H001-000 T/R INHIBITION KIT through the forward hole of the ICU (2) and the inhibit lever (1).
(1) Remove the tethered pin (3) from aft hole (5) of the inhibit lever (1).
(2) Move the inhibit lever (1) against the inhibit plunger (4).
(3) Check that "ICU INHBITED" is now visible.
(4) Install the 98N7830H001-000 T/R INHIBITION KIT through the forward hole of the ICU (2) and the inhibit lever (1).