Installation of the Aft Engine Mount Bolt One at a Time [IAE]

TASK 71-22-11-400-803-A
Installation of the Aft Engine Mount Bolt One at a Time

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.

ZONE: 400

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	1	WRENCH - TORQUE
No specific	Torque wrench: range to between 520 and 480 lbf.ft (70.50 and 65.08 m.daN )
No specific	Torque wrench: range to between 800 and 90 lbf.in (9.04 and 1.02 m.daN )
98D71203001000	1	CHEST,TORQUE SET-ENGINE R I

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-410)	Isopropyl Alcohol, Reagent grade
(Material No.V02-147)	lockwire
(Material No.V02-272)	safety cable
(Material No.V02-273)	safety cable
(Material No.V02-274)	safety cable
(Material No.V02-275)	safety cable
(Material No.V02-276)	safety cable
(Material No.V02-277)	safety cable
(Material No.V02-278)	safety cable
(Material No.V02-279)	safety cable
(Material No.V02-280)	safety cable
(Material No.V02-281)	safety cable
(Material No.V10-078)	anti-seize compound

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-05-230-010-A	Local Application of Fluorescent Penetrant Inspection
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 70-40-11-911-014-A	Locking Devices General Information
TASK 70-40-11-911-016-A	General Instructions for Uses of Safety Cable
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Aft Engine Mount Bolts

3. Job Set-up
Subtask 71-22-11-941-064-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU:

Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 71-22-11-010-093-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 71-22-11-040-071-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU)

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Make sure that the thrust reverser Hydraulic Control Unit (HCU) is deactivated (Ref. AMM TASK 78-30-00-040-012).

Subtask 71-22-11-010-095-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the thrust reverser halves are open (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.

Subtask 71-22-11-110-060-A ** ON A/C NOT FOR ALL

E. Cleaning

NOTE: If you use the bolts (2), nuts (6), retainers (7) and washers (3) that were used before, do Steps E, F and G. If you use new bolts (2), nuts (6), retainers (7), and washers (3), or you use shop inspected bolts (2), nuts (6), retainers (7) and washers (3), it is not necessary to do Steps E, F and G.

(1) Clean the bolts (2), nuts (6), retainers (7) and washers (3) with the V01-410Isopropyl Alcohol, Reagent grade.

Subtask 71-22-11-210-075-A ** ON A/C NOT FOR ALL

F. Make sure there are no signs of important seizure or wear on the bolts (2) and the nuts (6).

Subtask 71-22-11-230-054-A ** ON A/C NOT FOR ALL

G. Inspection of the bolts (2), the retainers (7) and the washers (3)
(1) Do a fluorescent penetrant inspection level 3 of the mount bolts (2) (Ref. AMM TASK 70-23-05-230-010).

No cracks are permitted.

(2) Visually examine the retainers (7) and the washers (3) for indication of damage. If there are scratches, marks and/or other damage, reject the parts.

4. Procedure
Subtask 71-22-11-420-065-A ** ON A/C NOT FOR ALL

A. Installation of the Aft Engine Mount-Bolt One at a Time
(1) Lubricate the threads of the bolts (2), washers (3) and nuts (6) with anti-seize compound (Material No.V10-078) .
(a) Installation of the barrel nut:

CAUTION: INSTALL THE BARREL NUT WITH THE ROUNDED SIDE UP. IF NOT, DAMAGE TO THE BARREL NUT CAN OCCUR.

1 Put the barrel nuts (6) with the rounded side up and the retainers (7) in the aft engine mount (4).
(b) Installation of the washers:

CAUTION: THE INNER DIAMETER OF THE WASHER HAS A CHAMFER ON ONE SIDE ONLY. YOU MUST PUT THE CHAMFER AGAINST THE HEAD OF THE BOLT SO THAT IT AGREES WITH THE RADIUS OF THE HEAD OF THE BOLT. INCORRECT INSTALLATION OF THE WASHER CAN DAMAGE THE HEAD OF THE BOLT.

1 Put the washers (3) on the bolts (2) so the chamfer of the washer (3) agrees with the radius of the head of the bolt (3).
(c) Put the bolts (3) through the holes in the pylon and the aft engine mount (4).
(d) Install the bolts (3) into the barrel nuts (6).
(e) Do a check of the running torque of the aft mount bolts as follows:
1 Hand install the bolts on the barrel nuts until the bolts become hard to turn.
2 With the WRENCH - TORQUE, screw the bolt into the barrel nut. Two threads must come out of the bottom of the barrel nut. The running TORQUE must be to between 800 and 90 lbf.in (9.04 and 1.02 m.daN )

.
3 Allow the bolt and the barrel nut cool for one minute.
4 Use the WRENCH - TORQUE to loosen the bolt from the barrel nut. The breakaway TORQUE must be to between 800 and 90 lbf.in (9.04 and 1.02 m.daN )

.
5 If the barrel nut does not keep the correct running torque, replace the barrel nut and do again Steps 4.(1).(a) through 4.(1).(e).
(f) Torque the aft engine mount bolt:
1 Use the 98D71203001000 CHEST,TORQUE SET-ENGINE R I to TORQUE the aft engine mount bolts to the final torque value to between 520 and 480 lbf.ft (70.50 and 65.08 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(g) Safety of the bolts:

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

CAUTION: YOU CAN USE SAFETY CABLE OR SAFETY WIRE TO SAFETY THE BOLTS. YOU MUST INSTALL THE SAFETY WIRE OR THE CABLE TIGHTLY. IF YOU DO NOT OBEY THIS PRECAUTION, DAMAGE TO THE PYLON CAN OCCUR.

1 Install the safety cable (Material No.V02-275) for each bolt (2) (Ref. AMM TASK 70-40-11-911-016).
2 Alternate:
a Use the lockwire (Material No.V02-147) (Ref. AMM TASK 70-40-11-911-014) or safety cable (Material No.V02-272) or safety cable (Material No.V02-273) or safety cable (Material No.V02-274) or safety cable (Material No.V02-276) or safety cable (Material No.V02-277) or safety cable (Material No.V02-278) or safety cable (Material No.V02-279) . Or use the safety cable (Material No.V02-280) or safety cable (Material No.V02-281) (Ref. AMM TASK 70-40-11-911-016).

NOTE: You can use the lockwire diameters ranging from 0.031 in. (0.79 mm) to 0.047 in. (1.19 mm) to safety the bolts.

5. Close-up
Subtask 71-22-11-410-094-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 halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 71-22-11-440-066-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-440-012).

Subtask 71-22-11-410-095-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:30:26 UTC