Installation of the Thrust Reverser Ground-Straps [PW11]

TASK 78-32-05-400-801-A
Installation of the Thrust Reverser Ground-Straps

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

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)
No specific	1	OHMMETER MULTIRANGE
No specific	Torque wrench: range to between 126.55 and 97.35 lbf.in (1.43 and 1.10 m.daN )
No specific	Torque wrench: range to between 157.54 and 122.14 lbf.in (1.78 and 1.38 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBD1)	Non Aqueous Cleaner-- Isopropyl Alcohol -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

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
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Thrust Reverser Ground Straps

3. Job Set-up
Subtask 78-32-05-941-051-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 78-32-05-010-052-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
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position.

Subtask 78-32-05-040-051-A ** ON A/C NOT FOR ALL

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 maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 78-32-05-010-053-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the thrust reverser cowl-doors are open (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR

4. Procedure
Subtask 78-32-05-420-050-A ** ON A/C NOT FOR ALL

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

A. Installation of the Thrust Reverser Ground-Straps

NOTE: The following procedure is for the installation of the ground strap on the left thrust-reverser cowl-door. The ground strap installation procedure is the same for the right thrust-reverser cowl-door.

(1) Clean the pylon bracket with a Textile-Lint free Cotton - (Material No.14SBA1) and Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) or equivalent. Clean the thrust reverser surface with a Textile-Lint free Cotton - (Material No.14SBA1) and Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) or equivalent. Remove the alcohol with a Textile-Lint free Cotton - (Material No.14SBA1) before it dries.
(2) Attach the ground strap (3) to the thrust reverser with the screw (5) and the washer (4).
(3) TORQUE the screw (5) to between 157.54 and 122.14 lbf.in (1.78 and 1.38 m.daN )

.
(4) Attach the ground strap (3) to the pylon with the screw (2) and the washer (1).
(5) TORQUE screw (2) to between 126.55 and 97.35 lbf.in (1.43 and 1.10 m.daN )

Subtask 78-32-05-200-050-A ** ON A/C NOT FOR ALL

B. Check Electrical bonding
(1) Measure the resistance between the ground strap lug and a no protected surface on the pylon with an OHMMETER MULTIRANGE.
(a) Make sure that the resistance value (Ohmic) is not more than 0.5 milliohms.
(2) Measure the resistance between the ground strap lug and a no protected surface on the thrust reverser cowl with an OHMMETER MULTIRANGE.
(a) Make sure that the resistance value (Ohmic) is not more than 0.5 milliohms.

5. Close-up
Subtask 78-32-05-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 78-32-05-440-050-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-05-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) 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
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:32:45 UTC