Opening of the Thrust Reverser (T/R) Cowl Doors Hold Open Rod (HOR) Missing [CFML]

TASK 78-36-00-040-812-A
Opening of the Thrust Reverser (T/R) Cowl Doors Hold Open Rod (HOR) 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.

1. Reason for the Job
CDL 78-07
Thrust Reverser Hold Open Rod
To open the thrust reverser half-doors, if the thrust reverser cowl HOR is missing.
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
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 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-42-000-802-A	Removal of the Hold Open Rod (HOR)
TASK 78-36-42-400-802-A	Installation of the Hold Open Rod (HOR)

3. Job Set-up
Subtask 78-36-00-941-073-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 a WARNING NOTICE(S) 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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 78-36-00-010-128-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 78-36-00-040-085-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 78-36-00-010-129-A

A. Opening of the Thrust Reverser Cowl-Doors with Hold Open Rod (HOR) Missing

WARNING: DO NOT DO MAINTENANCE IN THE CORE AREA WITHOUT THE THRUST REVERSER HOR. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY TO PERSONNEL OR DAMAGE TO EQUIPMENT CAN OCCUR.

(1) Install the thrust reverser cowl-doors HOR on the thrust reverser cowl-doors:
(a) Remove the thrust reverser cowl HOR from opposite thrust reverser half-door or from the other engine (Ref. AMM TASK 78-36-42-000-802).
(b) Install the thrust reverser cowl HOR (Ref. AMM TASK 78-36-42-400-802).
(2) Open the thrust reverser cowl door (Ref. AMM TASK 78-36-00-010-806).

[Rev.10 from 2021] 2026.04.01 03:36:48 UTC