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 49-91-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CAUTION: BE CAREFUL NOT TO MOVE THE TWO APU ACCESS DOORS TO THE
_______ OUTBOARD SIDE FROM THE FULL OPEN POSITION. THE FULL OPEN POSITION IS WHERE THE APU ACCESS DOOR IS DOWN AND THE TWO HOLD-OPEN RODS ARE CONNECTED TO THE TWO BRACKETS ON THE APU COMPARTMENT BULKHEAD. DAMAGE TO THE ELEVATOR CONTROL SURFACES CAN OCCUR.
 (b)  
Open the left access door to the fully open position and remove the two hold-open rods from the two clips.

 (c)  
Remove the two quick-release pins from the two brackets on the left APU compartment bulkhead.

 (d)  
Connect the two hold-open rods from the left access door to the two brackets and install the two quick-release pins.

 (e)  
Push the right access door up and remove the lanyard from the pin on the aft APU compartment bulkhead.

 (f)  
Open the right access door to the fully open position and remove the two hold-open rods from the two clips.

 (g)  
Remove the two quick-release pins from the two brackets on the right APU compartment bulkhead.

 (h)  
Connect the two hold-open rods from the right access door to the two brackets and install the two quick-release pins.

 D.
Air-Cooled Oil Cooler Removal

 S 024-027
 (1)  
Do these steps to remove the air-cooled oil cooler (4):

 (a)  
Put the container below the APU.

 (b)  
Loosen the clamp (1) that attaches the air-cooled oil cooler (4) to the cooling air outlet duct.

 (c)  
Disconnect the cooling air outlet duct from the air-cooled oil cooler (4) and remove the clamp (1).

 (d)  
Remove the four nuts (3) and four washers (2) that attach the air-cooled oil cooler (4) to the load gearbox.

 (e)  
Remove the air-cooled oil cooler (4).

 (f)  
Put the air-cooled oil cooler (4) above the container to drain the oil.

 (g)  
Remove the two transfer tubes (6) and four packings (5). 1) Discard the four packings (5).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SEE  A 
FWD  SEE  B 
APU COMPARTMENT  4. AIR-COOLED OIL COOLER  A  FWD 
1. CLAMP (4 LOCATIONS) 2. WASHER (4 LOCATIONS) 3. NUT  (4 LOCATIONS) 5. PACKING 
(2 LOCATIONS) 6. TRANSFER TUBE 
COOLING AIR OUTLET DUCT 

FWD
B

Air-Cooled Oil Cooler Installation
Figure 401

L78752
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (h)  
Make sure you install all necessary protection covers.

 (i)  
Remove the container.

 TASK 49-91-01-404-011
 3. Air-Cooled Oil Cooler Installation (Fig. 401)
__________________________________
 A. References
 (1)  
AMM 12-13-02/301, Auxiliary Power Unit

 (2)  
AMM 49-11-00/201, Auxiliary Power Unit

 B.
Consumable Materials

 (1)  
D00418 Oil - Aircraft Turbine Engine

 C. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 4 | Oil Cooler Assembly (Air-Cooled | 49-91-01 | 01 | 55 or | | | | Oil-Cooler) | | | 65 | | | 5 | Packing | | | 30 | 2.......….......…...................................…...........…......….......1
 D. Access
 (1)  
Location Zones
 221 Control Cabin - Left
　
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