Installation of the Thrust Reverser Cowl Opening System (COS) Engine Bracket [CFML]

TASK 78-36-51-400-804-A
Installation of the Thrust Reverser Cowl Opening System (COS) Engine 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
Self explanatory
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)
No specific	Torque wrench: range to between 0.76 and 0.64 m.daN (67.26 and 56.64 lbf.in )

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 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
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
Thrust Reverser COS Actuator Support Brackets (PRE SB BD70CR78-010)
Thrust Reverser COS Actuator Support Brackets (POST SB BD70CR78-010)

3. Job Set-up
Subtask 78-36-51-941-062-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 78-36-51-010-076-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
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.

Subtask 78-36-51-040-064-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) Make sure that you did the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 78-36-51-010-077-A

D. Get Access
(1) Make sure that the thrust reverser latches are open (Ref. AMM TASK 78-36-00-010-806).
(2) Make sure that the thrust reverser cowl opening actuator are removed (Ref. AMM TASK 78-36-51-000-802).

4. Procedure
Subtask 78-36-51-420-055-A

A. Installation of the Cowl Opening System (COS) Actuator Support Bracket (1) on the Left Side of the Thrust Reverser

Thrust Reverser COS Actuator Support Brackets (PRE SB BD70CR78-010)

PRE SB BD70CR78-010

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

(1) Put the actuator support bracket (1) in position on the aft fan case of the engine.
(2) Install the three bolts (2) that attach the actuator support bracket (1) to the aft fan case of the engine.
(3) TORQUE the three bolts (2) to between 0.76 and 0.64 m.daN (67.26 and 56.64 lbf.in )

.

END OF PRE SB BD70CR78-010

Subtask 78-36-51-420-057-A

B. Installation of the COS Actuator Support Bracket (3) on the Left Side of the Thrust Reverser

Thrust Reverser COS Actuator Support Brackets (POST SB BD70CR78-010)

POST SB BD70CR78-010

NOTE: This procedure is given for the left thrust reverser cowl opening system bracket. It is also applicable to the right thrust reverser cowl opening system bracket.

(1) Put the actuator support bracket (3) in position on the aft fan case of the engine.
(2) Install the three bolts (4) and three washers (5) that attach the actuator support bracket (3) to the aft fan case of the engine.
(3) TORQUE the three bolts (4) to between 0.76 and 0.64 m.daN (67.26 and 56.64 lbf.in )

.

END OF POST SB BD70CR78-010

5. Close-up
Subtask 78-36-51-410-064-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the thrust reverser cowl opening actuator (Ref. AMM TASK 78-36-51-400-802).
(3) Close the thrust reverser latches (Ref. AMM TASK 78-36-00-410-806).

Subtask 78-36-51-440-056-A

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

Subtask 78-36-51-410-065-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 access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:37:16 UTC