Special Detailed Inspection (TC) of Aft Engine Mount Pylon Bolts, LH/RH [CFML]

TASK 71-22-11-220-802-A
Special Detailed Inspection (TC) of Aft Engine Mount Pylon Bolts, LH/RH

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.

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

WARNING: YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.

ZONE: 400

1. Reason for the Job
Refer to the MPD TASK: 712233-01
SPECIAL DETAILED INSPECTION (TC) OF AFT ENGINE MOUNT PYLON BOLTS, LH/RH.
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 0.47 and 0.37 m.daN (41.59 and 32.74 lbf.in )
No specific	Torque wrench: range to between 23.1 and 18.9 m.daN (170.35 and 139.38 lbf.ft )
98D71203014000	1	TORQUE WRENCH SET CFM

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2674)	lint-free cloth

C. Work Zones and Access Panels

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

D. 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 71-22-11-000-805-A	Removal of the Aft Engine Mount Bolts (One at a time)
TASK 71-22-11-400-805-A	Installation of the Aft Engine Mount Bolts (One at a time)
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
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
Special Detailed Inspection (TC) of Aft Engine Mount Pylon Bolt

3. Job Set-up
Subtask 71-22-11-941-066-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 71-22-11-010-099-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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 71-22-11-040-074-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) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 71-22-11-010-100-A

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

4. Procedure
Subtask 71-22-11-220-053-A

A. Special Detailed Inspection (TC) of the Aft Engine-Mount Pylon Bolts

NOTE: This procedure is written for only one aft engine-mount pylon bolt. Apply this procedure to each Aft engine-mount pylon bolts.

NOTE: Do not loosen the bolt before to make the torque check.

(1) Get access to the Aft engine mount at 12 o'clock area (engine junction area).
(2) Clean any dirt or unwanted material from the Aft engine mount with a lint-free cloth (Material No.CP2674) .
(3) Torque check of the aft engine mount bolt (3):
(a) Remove the locking plates system of the aft engine mounts:
1 Remove the four screws (1) that attach the four locking plates (2) to the retainer (5).
2 Remove the four locking plates (2).
3 Visually examine the four screws (1), the four locking plates (2) and the retainer (5) for indication of damage.
a If there are scratches, marks and/or other damage, reject the parts.
(b) Measure the torque of the aft mount bolt (3).
1 The TORQUE value of the aft engine mount bolt (3) must be to between 23.1 and 18.9 m.daN (170.35 and 139.38 lbf.ft )

.
a Use the tool 98D71203014000 TORQUE WRENCH SET CFM to torque the bolts.
2 If the bolts (3) turn or if the torque value is less than the required torque value, replace the four bolts (3), the four washers (4) and the two barrel nuts and their retainers (6) (Ref. AMM TASK 71-22-11-000-805) and (Ref. AMM TASK 71-22-11-400-805).
3 If the torque value is correct, do the following procedure:
a Install the four locking plates (2) and attach them to the retainer brackets (5) with the four screws (1).
b TORQUE the screw (1) to between 0.47 and 0.37 m.daN (41.59 and 32.74 lbf.in )

5. Close-up
Subtask 71-22-11-410-099-A

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 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 71-22-11-440-068-A

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 71-22-11-410-100-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] 2026.04.02 06:33:26 UTC