F.
Put the Airplane Back to Its Usual Condition
S 416-044
(1)
Close the left APU access door, 317AL, and right APU access door, 318AR:
(a)
Remove the two quick-release pins, disconnect the two hold-open rods and put the two hold-open rods in the two clips on the right access door.
(b)
Install the two quick-release pins in the two brackets on the right APU compartment bulkhead.
(c)
Lift the right access door until you can install the lanyard on the pin at the aft APU compartment bulkhead.
NOTE: The lanyard will hold the right access door on the APU
____
compartment bulkhead.
(d)
Remove the two quick-release pins, disconnect the two hold-open rods and put the two hold-open rods in the two clips on the left access door.
(e)
Install the two quick-release pins in the two brackets on the left APU compartment bulkhead.
(f)
Make sure the insulation covers are correctly attach to the APU compartment firewall.
(g)
Lift the left access door until the two APU access doors are approximately aligned.
(h)
Close the two APU access doors.
(i)
Close the six latches on the right access door.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
49-21-00
ALL ú ú 02 Page 631 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
LOAD GEARBOX FRONT HOUSING - REPAIRS
____________________________________
1. General_______
A. The front housing of the load gearbox has intumescent paint on an anodized finish. This procedure contains two tasks. The first task is a touch-up procedure for the anodized finish. The secound task is to repair the intumescent paint.
B. If there is separation of the intumescent paint, it is recommended that you do the repair procedure for the intumescent paint. Intumescent paint that has separated from the front housing of the load gearbox can remove the anodized coating. If the separation of the intumescent paint has removed the anodized finish, you must do the touch-up procedure for the anodized finish.
C. The front housing of the load gearbox is on the forward lower section of the APU.
D. You can get access to the front housing through the APU access doors.
TASK 49-21-07-308-024
2. Anodize Finish Touch-Up_______________________
A. Standard Tools and Equipment
(1)
Container - 1 U.S. gallon (4 Liter) capacity
(2)
Spatula - Plastic
B.
Consumable Materials
(1)
G02150 Agent - Wetting
(2)
G01044 Cloth - Abrasive, Crocus P-C-458
(3)
G00959 Cloth - Emery, No. 400 (optional to the crocus cloth)
(4)
G01043 Cloth - Lint Free
(5)
G02077 Powder, Iridite (No. 14-2)
(6)
B00148 Solvent - Perchlorethylene PMC 9015
(7)
G02227 Water - High Purity
C.
Access
(1)
Location Zone 318 APU Compartment - Load Gearbox Front Housing
(2)
Access Panel
317AL APU Access Door
318AR APU Access Door
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ALL ú ú 01 Page 801 ú Jun 10/95
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A
747-400 MAINTENANCE MANUAL
D. Prepare for the Anodized Finish Repair
S 868-016
(1)
Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.
S 868-017
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
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