Installation of the Thrust Reverser Hold Open Rods (HOR) [PW11]

TASK 78-36-04-400-801-A
Installation of the Thrust Reverser Hold Open Rods (HOR)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 400
FIN: 3420KM ** ON A/C NOT FOR ALL
FIN: 3421KM ** ON A/C NOT FOR ALL

1. Reason for the Job
This procedure is the same for the left and right thrust reverser cowl door hold open rods.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 90 and 81 lbf.in (1.02 and 0.92 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	lint-free cotton cloth
(Material No.PU2-0001)	alcohol, isopropyl
(Material No.PU4-0002)	epoxy primer, fluid resistant
(Material No.PU4-0004A)	curing solution, epoxy primer
(Material No.PU4-0005)	thinner

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
Thrust Reverser Hold Open Rods (HOR)

3. Job Set-up
Subtask 78-36-04-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 78-36-04-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR

Subtask 78-36-04-040-051-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser 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 maintenance (Ref. AMM TASK 78-30-00-040-805).

4. Procedure
Subtask 78-36-04-420-050-A ** ON A/C NOT FOR ALL

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

A. Install the thrust reverser Hold Open Rod (HOR) (1).

NOTE: There is one HOR on each thrust reverser half. This installation procedure is the same for each HOR.

(1) Removal of protection covers

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine.
(2) Clean the four bolts (2) and four washers (3) with a clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl
(3) Clean the mating surfaces of the bracket at the bottom of the HOR (1) with a clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl.
(4) Remove the PU2-0001alcohol, isopropyl with a clean, dry lint-free cotton cloth (Material No.PU1-0001) before it dries.
(5) Mix the PU4-0002epoxy primer, fluid resistant, PU4-0004Acuring solution, epoxy primer and thinner (Material No.PU4-0005) . Refer to the instructions of the manufacturer.
(6) Apply a layer of the PU4-0002epoxy primer, fluid resistant mixture to the four washers (3) and the shaft of the four bolts (2).
(7) Apply a layer of the PU4-0002epoxy primer, fluid resistant mixture to the mating surface of the bracket at the bottom of the hold open rod (1).
(8) Make sure the mixture on the bracket is more than the diameter of the washers (3).
(9) Attach the HOR (1) to the torque box bracket with the four bolts (2) and four washers (3).
(10) TORQUE the bolts (2) to between 90 and 81 lbf.in (1.02 and 0.92 m.daN )

.
(11) Make sure that you retract the end of the applicable HOR (1) to its stowed position.
(12) Connect the other end of the HOR (1) to the HOR stow bracket on the thrust reverser torque box.

5. Close-up
Subtask 78-36-04-440-051-A ** ON A/C NOT FOR ALL

A. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 78-36-04-410-050-A ** ON A/C NOT FOR ALL

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 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:57:22 UTC