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A
747-400 MAINTENANCE MANUAL
 S 622-125
 (4)  
Make sure the humidity in the APU does not go higher than 40 percent:

 (a)  
Put the dessicant bags and the humidity indicators in the APU exhaust duct.

 (b)  
Install plugs, caps, and covers on all the APU ports and the openings.

 (c)  
Supply windows in the exhaust duct cover such that you can see the humidity indicators.

 (d)  
Examine the humidity indicators each fourteen days if the airplane is in an open area.

 (e)  
If the humidity is less than 40 percent, no other steps are necessary.

 NOTE: The humidity is less than 40 percent when the
____ humidity indicator has a blue color.
 (f)  If the humidity is more than 40 percent, replace the dessicant bags.
 NOTE: The humidity is more than 40 percent when the
____ humidity indicator has a pink color.
 S 412-388
 (5)  
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
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 ALL  ú ú 09 Page 244 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 622-128
 (6)  If the APU is removed, put it where there is protection from damage and the weather.
 TASK 49-11-00-622-127
 14. APU Preservation (29 Days to 90 Days) (Fig. 203)
_____________________________________
 A. General
 (1)  
This task gives the instructions for the preservation of the APU. To do the preservation task you must prevent corrosion on the APU while it is unserviceable.

 (2)  
You can use the steps that follow for the preservation of an installed or a removed APU.

 B.
Equipment

 (1)  
PF53481-8PWS Cart - Servicing, Engine Oil, 5 Gallon Capacity Malabar International (Vendor Code 94861) 220 W. Los Angeles Avenue, P. O. Box 367, Simi Valley, CA 93065

 (2)  
G57NB-5 Collar - Circuit Breaker
 Nylon Molding Corp.
 1617 S. California
 Monrovia, CA. 91016 (two are necessary)

 (3)  
Container - Fuel Resistant, 5 U.S. Gallons (18.9 Liters)

 C.
Consumable Materials

 (1)  
G00034 Cloth, Process Cleaning Absorbent Wiper (Cheesecloth, Gauze)

 -BMS15-5
 (2)  
D00010 Compound, Anti-Seize - MIL-A-907 or

 (3)  
D00674 Compound, Anti-Seize (Solid Film Lubricant) - Ease-Off 990 -MIL-L-23398

 (4)  
G00626 Dehumidifier, Dessicant - MIL-D-3464

 (5)  
D00098 Fuel, Turbine Engine - P01-001

 (6)  
D50029 Lubricant, Fluorocarbon Release Agent (Spray) - PWC06-005
　
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