APU LOAD GEARBOX QAD RING
SCREW (8 PLACES)
QAD RING
ISOLATIOR SHIM TENSION BOLT (REF)

B
APU-Driven Generator Quick Attach - Detach (QAD) Ring Installation
D21005
Figure 401A

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A
747-400 MAINTENANCE MANUAL
 TASK 24-21-02-404-005
 3.  APU-Driven Generator Quick Attach-Detach (QAD) Ring Installation (Fig. 401)________________________________________________________________
 A. Consumable Materials
 (1)  
D00368 Lubricant - Silicone Grease, Dow Corning No. 4

 B.
References

 (1)  
24-21-03/401, APU-Driven Generator

 (2)  
IPC 49-51-02 Fig. 1

 C.
Access

 (1)  
Location Zone
 317 APU Compartment, LH
 318 APU Compartment, RH

 (2)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

 D.
Procedure

 S 424-012
 (1)  Install the QAD ring.
 CAUTION:_______DO NOT APPLY TOO MUCH GREASE ON THE SCREWS. THE GREASE CAN CAUSE A HYDRAULIC EFFECT IN THE BLIND HOLES OF THE GEARBOX WHEN YOU TIGHTEN THE QAD RING.
 (a)  
Apply a thin layer of grease to the screws that attach the QAD ring to the APU load gearbox.

 (b)  
If you removed the isolator shim, install it on the APU load gearbox.

 (c)  
Put the QAD ring in its position, with the locator pin at the 9 o'clock position.

 (d)  
Install the eight screws that attach the QAD ring to the APU load gearbox. 1) Tighten the screws to 200 pound-inches.

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747-400 MAINTENANCE MANUAL
 S 434-011
 (2) Install the APU-driven generator (Ref 24-21-03/401).
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A
747-400 MAINTENANCE MANUAL
 APU-DRIVEN GENERATOR QUICK ATTACH-DETACH (QAD) RING - INSPECTION/CHECK
______________________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. One task is an inspection of the quick attach-detach (QAD) ring for the APU-driven generator. The other task is a check of the torque on the tension bolt of the QAD ring.
 B.  The QAD ring attaches the APU-driven generator to the APU load gearbox. You must remove the generator to do an inspection of the QAD ring.
 C.  The tension bolt holds the QAD ring closed. The generator must be installed when you do a check of the torque on the bolt.
 D.  Access to the QAD ring for the APU-driven generator is through the APU access doors.
 TASK 24-21-02-206-001
 2.  APU-Driven Generator Quick Attach-Detach (QAD) Ring Inspection (Fig. 601)______________________________________________________________
 A.  References
 (1)  
AMM 24-21-03/401, APU-Driven Generator

 (2)  
AIPC 49-51-02 Fig. 1

 B.  
Access

 (1)  
Location Zone
 317 APU Compartment, LH
 318 APU Compartment, RH

 (2)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

 C.  
Procedure

 (1)  
Remove the APU-driven generator (AMM 24-21-03/401).

 S 216-013

 (2)  
Examine the QAD ring and the surfaces of the adapter plate for nicks and burrs.
　
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