Deactivation of the Thrust Reverser Hold Open Rod (HOR) Bracket [CFML]

TASK 78-36-00-040-814-A
Deactivation of the Thrust Reverser Hold Open Rod (HOR) Bracket

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 78-42
Thrust Reverser Hold Open Rod Fitting
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 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 78-36-00-040-812-A	Opening of the Thrust Reverser (T/R) Cowl Doors Hold Open Rod (HOR) Missing
TASK 78-36-00-440-812-A	Closing of the Thrust Reverser (T/R) Cowl Doors Hold Open Rod (HOR) Missing
TASK 78-36-42-000-802-A	Removal of the Hold Open Rod (HOR)
Deactivation/Reactivation of the Thrust Reverser Hold Open Rod (HOR) Bracket

3. Job Set-up
Subtask 78-36-00-941-077-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:

The ENG/MODE selector switch, and
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 78-36-00-010-133-A

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

Subtask 78-36-00-040-089-A

C. Deactivation of the Thrust Reverser System for Nacelle 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) Do the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

4. Procedure
Subtask 78-36-00-020-062-A

A. Deactivation of the Thrust Reverser HOR Bracket

Deactivation/Reactivation of the Thrust Reverser Hold Open Rod (HOR) Bracket

NOTE: This procedure is given for the HOR on the left thrust reverser. It is also applicable to the HOR on the right thrust reverser.

(1) Remove the thrust reverser HOR (Ref. AMM TASK 78-36-42-000-802).
(2) If maintenance task must be performed:
(a) Open the thrust reverser cowl door with HOR missing (Ref. AMM TASK 78-36-00-040-812).
(b) Close the thrust reverser cowl door with HOR missing (Ref. AMM TASK 78-36-00-440-812).

5. Close-up
Subtask 78-36-00-410-122-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.

Subtask 78-36-00-440-078-A

B. Do the reactivation of the thrust reverser after nacelle maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 78-36-00-410-123-A

C. Close Access
(1) 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
(2) Remove the WARNING NOTICE(S).
(3) Make an entry in the logbook.

[Rev.10 from 2021] 2026.04.01 03:36:53 UTC