S 864-003

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6-2 Main Power Distribution Panel
 1) 6K18, APU ALTN CONT

 (b)  
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT

 S 014-030
 (3)  
Open the left APU access door, 317AL, and right APU access door, 318AR:

 (a)  
While you hold the two APU access doors in the closed position, open the six latches on the right access door.

 NOTE: The left access door will open fully and the right
____ access door will drop approximately one inch (2.5 cm) from the fuselage frame when the last latch is opened.
 NOTE: A lanyard is attached to the aft end of the right access
____ door to hold the access door to the APU compartment bulkhead.
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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.
Fuel-Cooled Oil Cooler Removal

 S 024-024
 (1)  
Do these steps to remove the fuel-cooled oil cooler (5):

 (a)  
Put the fuel and oil containers below the fuel-cooled oil cooler (5).

 (b)  
Disconnect the fuel supply tube (9) and fuel return tube (8) from the fuel-cooled oil cooler (5).

 (c)  
Drain the fuel from the fuel supply tube (9), fuel return tube

 (8)
 and fuel-cooled oil cooler (5) into the fuel container.

 (d)  
Remove the two tube nipples (7) and two packings (6) from the fuel-cooled oil cooler (5). 1) Discard the two packings (6).

 (e)  
Remove the three nuts (4) and three washers (5) that attach the fuel-cooled oil cooler (5) to the oil sensor housing.

 (f)  
Remove the fuel-cooled oil cooler (5).

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A
747-400
MAINTENANCE MANUAL

SEE  A  FWD 
APU COMPARTMENT  SEE  B 
FWD 
A 

1.
 TRANSFER TUBE

2.
 PACKING (QTY 2)

OIL SENSOR 11. PACKING
HOUSING 3. WASHER (3 LOCATIONS)
(QTY 2) 10. TRANSFER 4. NUT TUBE OUTLETFWD (3 LOCATIONS)
PORT
INLET PORT 5. FUEL-COOLED 9. FUEL SUPPLY OIL COOLERTUBE
8. FUEL RETURN  6. PACKING TUBE (2 LOCATIONS)
7. TUBE NIPPLE (2 LOCATIONS)
B
Fuel-Cooled Oil Cooler Installation Figure 401
L76804
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