(c)  
Measure the torque on the tension bolt.

 (d)  
If the torque is more than 180 pound-inches (20.3 N.m.), tighten the bolt to 240-264 pound-inches (27.1-29.8 N.m.).

 (e)  
If the torque is less than 180 pound-inches (20.3 N.m.), do these steps: 1) Tighten the tension bolt to 240-264 pound-inches (27.1-29.8

 N.m.).
 2)  Tap the QAD ring again and measure the torque on the tension bolt. Continue tapping and tightening the tension bolt until the torque does not drop below 180 pound-inches
 (20.3 N.m.) after tapping the QAD ring.
 3)  Tighten the tension bolt to a torque of 240-264 pound-inches (27.1-29.8 N.m.).
 (f)  
Install lockwire on the tension bolt.

 (3)  
Close the left thrust reverser half (AMM 78-31-00/201).

 S 416-017
 TASK 24-11-08-206-019
 4.  IDG Quick Attach-Detach (QAD) Ring Tension Bolt Distance Check (Fig. 601)
______________________________________________________________
 A.  Standard Tools and Equipment
 (1)  Micrometer
 B.  References
 (1)  AIPC 24-11-01, Fig. 2
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747-400
MAINTENANCE MANUAL

 (2)  
AMM 78-31-00/201, Thrust Reverser System

 C.
Access

 (1)  
Location Zone
 412 Engine 1 - Main Gearbox Aft Face 7 o'clock
 422 Engine 2 - Main Gearbox Aft Face 7 o'clock
 432 Engine 3 - Main Gearbox Aft Face 7 o'clock
 442 Engine 4 - Main Gearbox Aft Face 7 o'clock

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 D.
Procedure

 S 016-020
 (1)  
Open the left thrust reverser half (AMM 78-31-00/201).

 S 226-022

 (2)  
Do the IDG Quick Attach-Detach (QAD) Ring Tension Bolt Torque Check task.

 S 226-020

 (3)  
Measure the distance between the ring lug and the bracket on the QAD ring.

 NOTE: The distance from the center of the QAD tension nuts can be
____ used. The distance of 1.75 inches is the same as .562 inch.
 NOTE: The plug gage can be used to measure the .562 inch distance.
____
 (a)  
The plug gage can be used to make sure the QAD gap is not smaller than the minimum distance. 1) Grasp the plug gage flats. Use the thumb and fore finger

 to hold the gage in the QAD.

 (b)  
If the distance is greater than 0.562 inch (14.28 mm) or 1.75 inch (44.45mm), the QAD ring is satisfactory.

 NOTE: The distance 1.75 inch is measured from the center of
____
 QAD tension nuts.

 (c)  If the distance is less than 0.562 inch (14.28 mm) or 1.75 inch (44.45mm) , replace the IDG QAD ring (AMM 24-11-08/401).
 NOTE: The distance 1.75 inch is measured from the center of
____
 the QAD tension nuts.

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 S 416-023
 (4) Close the left thrust reverser half (AMM 78-31-00/201).
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747-400 MAINTENANCE MANUAL
 IDG AIR/OIL HEAT EXCHANGER - REMOVAL/INSTALLATION
_________________________________________________
　
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