Closing of the Thrust Reverser (T/R) Cowl Doors with Cowl Opening Actuator Missing [CFML]

TASK 78-36-00-440-811-A
Closing of the Thrust Reverser (T/R) Cowl Doors with Cowl Opening Actuator Missing

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 Job
To close the thrust reverser half-doors when the thrust reverser cowl opening actuator is missing (under CDL 78-01).
Thrust Reverser Opening Actuator
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
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 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 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
TASK 78-36-51-000-802-A	Removal of the Thrust Reverser Cowl Opening System
TASK 78-36-51-400-802-A	Installation of the Thrust Reverser Cowl Opening System

3. Job Set-up
Subtask 78-36-00-941-071-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:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(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 78-36-00-010-126-A

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 78-36-00-040-083-A

C. Deactivation of the Thrust Reverser System for Maintenance

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).

4. Procedure
Subtask 78-36-00-410-116-A

A. Closing of the Thrust Reverser Cowl-Doors with Cowl Opening Actuator Missing

WARNING: DO NOT DO MAINTENANCE IN THE CORE AREA WITHOUT THE THRUST REVERSER OPENING ACTUATOR AND THE HOLD OPEN ROD (HOR). THE ACTUATOR AND THE HOR MUST BE SAFETIED. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY TO PERSONNEL OR DAMAGE TO EQUIPMENT CAN OCCUR.

(1) Install the thrust reverser cowl opening actuator on the thrust reverser cowl:
(a) Remove the thrust reverser cowl opening actuator from opposite thrust reverser half-door or from the other engine (Ref. AMM TASK 78-36-51-000-802).
(b) Install the thrust reverser cowl opening actuator (Ref. AMM TASK 78-36-51-400-802).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806).

5. Close-up
Subtask 78-36-00-440-072-A

A. Do the Reactivation of the Thrust Reverser System after Nacelle Maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 78-36-00-410-117-A

B. 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).

[Rev.10 from 2021] 2026.04.01 03:36:47 UTC