Check Torque of IDG QAD Tension-Bolt

TASK 24-21-41-200-803-A
Check Torque of IDG QAD Tension-Bolt

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: 435
ZONE: 445

1. Reason for the Job
Refer to the MPD TASK: 242100-18
CHECK TORQUE OF IDG QAD TENSION BOLT.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	DRIFT - BRASS
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 26 and 22 lbf.ft (3.53 and 2.98 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia
(Material No.03ABA1)	Synthetic base Lubricating Oil-Turbine Engine - -
(Material No.12ABE2)	Corrosion Preventive Compound-Water Displacing Oily Film System

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
435	FAN AND ACCESSORY GEARBOX
445	FAN AND ACCESSORY GEARBOX
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-11-11-911-001-A	Safetying with Lockwire
TASK 24-21-41-000-803-A	Removal of the Quick-Attach-Detach (QAD) Adapter of the IDG
TASK 24-21-41-400-803-A	Installation of the Quick-Attach-Detach (QAD) Adapter of the IDG
TASK 24-21-51-000-806-A	Removal of the Integrated Drive Generator (IDG) - IDG 1(2)
TASK 24-21-51-400-806-A	Installation of the Integrated Drive Generator (IDG) - IDG 1(2)
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
Torque Check of the Tension Bolt of the IDG QAD Adapter

3. Job Set-up
Subtask 24-21-41-941-061-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 WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and 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 WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 24-21-41-010-079-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

4. Procedure
Subtask 24-21-41-220-056-A

A. Torque Check of the Quick Attach/Detach (QAD) Adapter Tension-Bolt

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.

(1) Cut and discard the lockwire from the tension bolt (2).
(2) Apply Corrosion Preventive Compound-Water Displacing Oily Film System (Material No.12ABE2) with a spray to:

The QAD ring (1)
The mating surface between the QAD adapter plate (3) and the QAD ring (1), in the zone where you can get access.

(3) Lubricate the tension bolt (2) with Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) .
(4) Measure the torque value on the tension bolt (2).
(a) If the torque is less than 22 lbf.ft (2.98 m.daN):
1 TORQUE the tension bolt (2) to between 26 and 22 lbf.ft (3.53 and 2.98 m.daN )

.
(5) Tap the edge of the QAD ring (1) that you can see with a DRIFT - BRASS to make sure that the torque value that you measure is correct.
(6) Do the Steps (4) and (5) again until the torque value does not decrease by more than 2 lbf.ft (0.27 m.daN).
(7) TORQUE the tension bolt (2) to between 26 and 22 lbf.ft (3.53 and 2.98 m.daN )

.
(8) Shake the antidrive end of the IDG to do a check of the QAD adapter.
(a) If the IDG is loose:

Remove the IDG (Ref. AMM TASK 24-21-51-000-806).
Remove the QAD adapter (Ref. AMM TASK 24-21-41-000-803).
Install the QAD adapter that you removed (Ref. AMM TASK 24-21-41-400-803).
Install a new IDG (Ref. AMM TASK 24-21-51-400-806).

NOTE: When you send the IDG that you removed to the workshop, you must tell the personnel to replace the IDG mounting flange.

(b) If the IDG is not loose, do Step (9).
(9) Do Steps (4) and (5) again until the torque value does not decrease by more than 2 lbf.ft (0.27 m.daN).
(10) Do a check of the distance between the ring lug and the bracket of the QAD adapter:
(a) If the distance is less than 0.125 in. (3.2 mm):
1 Replace the IDG (Ref. AMM TASK 24-21-51-000-806) and (Ref. AMM TASK 24-21-51-400-806) but let the IDG accessory hoist stay installed, and do not attach the tubes, harnesses and other components.
2 Measure the distance again:
a If the distance is correct:

Safety the tension bolt (2) with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia, (Ref. AMM TASK 20-11-11-911-001) and remove the accessory hoist, attachment components, tube and harnesses.

b If the distance is not correct:

Replace the QAD adapter (Ref. AMM TASK 24-21-41-000-803) and (Ref. AMM TASK 24-21-41-400-803).

(b) If the distance is more than 0.125 in. (3.2 mm):
1 Safety the tension bolt (2) with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia, (Ref. AMM TASK 20-11-11-911-001).

5. Close-up
Subtask 24-21-41-410-075-A

A. 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 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.03.31 23:20:47 UTC