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 WARNING:_______DO NOT LET HOT OIL GET ON YOU. MAKE SURE FIVE MINUTES HAVE GONE BY SINCE THE LAST APU SHUTDOWN TO LET THE OIL SYSTEM PRESSURE GO TO ZERO. PUT ON PROTECTIVE CLOTHES, GOGGLES, AND EQUIPMENT, OR LET THE APU BECOME COOL. IF YOU REMOVE THE OIL FILLER CAP AND THE OIL SYSTEM HAS PRESSURE, A SPRAY OF HOT OIL CAN BURN YOU.
 WARNING:_______DO NOT LET THE OIL STAY ON YOUR SKIN. YOU CAN ABSORB POISONOUS MATERIALS FROM THE OIL THROUGH YOUR SKIN.
 CAUTION: DO NOT LET OIL GET ON THE APU OR OTHER COMPONENTS.
_______ IMMEDIATELY CLEAN THE OIL WHEN IT FALLS ON THEM. OIL CAN CAUSE DAMAGE TO PAINT AND RUBBER.
 (a)  
Lift and turn the handle on the oil filler cap counterclockwise to release the cap.

 (b)  
Remove the oil filler cap.

 NOTE: A chain is attached from the inner APU oil tank to the
____ oil filler cap to keep the oil filler cap with the APU.
 CAUTION: DO NOT MIX OILS OF DIFFERENT TYPES OR BRAND NAMES WHEN YOU
_______ ADD THE OIL IN THE APU OIL TANK. A MIXTURE OF SOME OILS WILL CHEMICALLY CHANGE AND CAN CAUSE DAMAGE TO THE APU.
 (c)  Slowly add the oil to the APU oil tank until the oil level is at the center of the top sight glass.
 NOTE: The top sight glass is on the right side of the APU oil
____
 tank.

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SEE  A 
SEE  B 
FWD 
APU COMPARTMENT 
SIGHT GLASS (FULL LEVEL) OIL LEVEL 
OIL LEVEL (FULL LEVEL) SIGHT GLASS  CAP OIL FILLER  FWD 
A SIGHT GLASS (ADD LEVEL) OIL LEVEL  TO AVOID RAMP SPILLS) (RECOMMENDED RUBBER HOSE 
B  FWD 
APU Oil Replenishing Figure 301 

F58234
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 (d)  
Before you install the oil filler cap on the APU oil tank, put the chain in the inner APU oil tank until you cannot see the chain.

 (e)  
Install the oil filler cap on the APU oil tank.

 (f)  
Turn the handle on the oil filler cap clockwise and push it down to lock the cap into position.

 F. Put the Airplane Back to Its Usual Condition
 S 863-011
 (1) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (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 863-017
 (2)  
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.

 S 413-010

 (3)  
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.
　
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