(4)  Clean the engine surfaces with a clean cloth made moist with the solvent.
 S 117-006
 CAUTION: DO NOT USE A WATER OR A STEAM SPRAY TO CLEAN THE APU
_______ COMPARTMENT SURFACES. THIS CAN CAUSE DAMAGE TO THE ELECTRICAL CONNECTORS, THE STARTER MOTOR, OR THE GENERATORS.
 (5)  
Clean the APU compartment surfaces with a clean rag and the solvent.

 S 417-007

 (6)  
Close the APU access doors.

 (a)  
Disengage the support rods for the APU access doors.

 (b)  
Put the support rods in the clips on the inner side of the APU access doors.

 (c)  
Make sure the insulation covers correctly attach to the APU compartment firewall.

 (d)  
Close the APU access doors.

 (e)  
Close the latches on the APU access doors.

 S 867-008
 (7)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6 Main Power Supply Panel
 1) 6K18 APU ALTN CONT

 (b)  
P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT

 S 867-009
 (8)  Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 panel.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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 ALL  ú ú 01 Page 702 ú Oct 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 AUXILIARY POWER UNIT - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
A removal of the auxiliary power unit (APU)

 (2)  
An installation of the APU.

 B.  
There are two procedures available for the removal and installation of the APU. Each procedure is optional to the other. The procedure that is used is given by the ground equipment that is available.

 (1)  
Procedure 1

 (a)  
This procedure uses three fishpole hoists to lift and lower the APU. Two of the hoists attach to the sides of the front yoke that is part of the APU stand assembly. During the removal of the APU, the front yoke is removed from the APU stand assembly. The front yoke is then attached to the front of the APU.

 (b)  
The third fishpole hoist attaches to a sling at the rear of the APU. The sling attaches to the two ground handling lugs on the sides of the APU.

 (2)  
Procedure 2

 (a)  
This procedure uses an APU hydraulic jackstand and a height adjustable stand to lift and lower the APU. The APU cradle is attached to the jackstand with bolts. The jackstand is put on the height adjustable stand. The height adjustable stand lifts the APU to the APU compartment. From there, the hydraulic jackstand moves the APU in and out of the APU compartment.

 C.  
You can get access to the APU through the two APU access doors.

 TASK 49-11-01-004-001
 2.  Auxiliary Power Unit Removal (Fig. 401, Fig. 402, Fig. 403, Fig. 404,____________________________ Fig. 405)
 A.  References
 (1)  AMM 24-21-02/401, APU-Driven Generator Quick Attach-Detach (QAD) Ring
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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 ALL  ú ú 02 Page 401 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
AMM 24-21-03/401, APU-Driven Generator

 (3)  
AMM 31-61-00/201, Integrated Display System

 (4)  
AMM 49-13-06/401, Cone Bolt Support Block

 (5)  
AMM 49-13-07/401, Aft Mount Link

 B.
Equipment

 (1)  
Container - Fuel Resistant, 5 U.S. Gallons (18.9 Liters)

 (2)  
G49002-85 Cradle - APU (Includes Hydraulic Jack Assembly)

 (3)  
PF51-002-1 Hoist - Fishpole, Manual Powered (Quantity of 3)
 06714 P. F. Industries Inc.
 151 S. Michigan St., Seattle, WA 98108-3225 or
　
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