747-400 AMM 飞机维护手册 机载辅助动力 2(76)

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 (c)  Do this task: Cooling Air Inlet Screen Removal (AMM 49-51-04/401).
 NOTE: It is necessary to remove the cooling air inlet duct and
____ cooling air inlet screen as an assembly to get access to the cooling fan.
 (d)  
Remove the four nuts (12) and four washers (11) that attach the cooling fan (3) to the load gearbox.

 (e)  
Remove the cooling fan (3).

 (f)  
Remove the three packings (6), (7), (8). 1) Discard the three packings (6), (7), (8).

 (g)  
Remove the transfer tube (10).

 (h)  
Remove the two packings (9).
 1) Discard the two packings (9).

 (i)  
Examine the cooling fan (3): 1) Examine the spur gearshaft for cracks and broken or damaged

 gear teeth. 2) Examine the cooling fan for cracks and bearing damage. 3) Make sure the cooling fan drive gearshaft sleeve is
 installed and the keywasher tabs are installed on the gearshaft bolts. 4) If you find one or more of the above damage, replace the cooling fan and/or the APU (AMM 49-11-01/401).
 (j) Make sure you install all necessary protection covers.
 TASK 49-51-02-404-013
 3. Cooling Fan Installation (Fig. 401)
________________________
 A. References
 (1)  
AMM 49-11-00/201, Auxiliary Power Unit

 (2)  
AMM 49-11-01/401, Auxiliary Power Unit

 (3)  
AMM 49-51-04/401, Cooling Air Inlet Screen

 B.
Consumable Materials

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

 -BMS15-5.
 (2)  
A00590 Compound, Silicone - MIL-S-8660

 (3)  
D00418 Oil - Aircraft Turbine Engine

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A
747-400
MAINTENANCE MANUAL

 C. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 3 | Cooling Fan Assembly (Cooling Fan)| 49-51-02 | 02 |45, 46,| | | | | | | 50 or | | | | | | | 55 | | | 6 | Packing | | | 25 | | | 7 | Packing | | | 20 | | | 8 | Packing | | | 40 | | | 9 | Packing | | | 30 | | | 13 | Packing | 49-21-07 | 01 | 200 | 2.......….......…...................................…...........…......….......1
 D. Access
 (1)  
Location Zones
 221 Control Cabin - Left
 222 Control Cabin - Right
 310 Fuselage - Station 2360 to Station 2792

 (2)  
Access Panels
 317AL APU Access Door - Left
 318AR APU Access Door - Right

 E.
Procedure

 S 424-061
 CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY.
_______ IF YOU DO NOT REMOVE THE PROTECTION COVERS, DAMAGE TO THE APU CAN OCCUR.
 (1)  
Do these steps to install the cooling fan (3):

 (a)  
Clean the mount surfaces and flanges of the cooling fan (3) and load gearbox with a cloth.

 (b)  
Lubricate the five new packings (6), (7), (8), (9) with a light coat of oil.

 (c)  
Install the two packings (9) on the transfer tube (10).

 (d)  
Put the transfer tube (10) in the cooling fan (3).

 (e)  
Install the packing (6) on the P3 transfer sleeve.

 (f)  
Apply a light coat of silicone compound to the cooling fan spigot and the faying surfaces of the load gearbox.

 NOTE: The cooling fan spigot is the circular grooved area
____ where the packing (7) is installed.
 (g)
Install the two packings (7), (8) on the cooling fan.

 (h)
Install the cooling fan (3) on the load gearbox.

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