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A
747-400
FAULT ISOLATION/MAINT MANUAL

FUEL LINE UNION
APU FUEL-FEED LINE

SHROUD FUEL FITTING
SHROUD
FWD
INBD
APU FUEL-FEED LINE (EXAMPLE)
D
APU FIREWALL
(REF)

BELLOWS APU FUEL SUPPLY
(REF) LINE SHROUD DRAIN
APU FUEL SUPPLY
LINE SHROUD

APU FUEL-FEED LINE

APU FUEL FWD INBD
SHROUD DRAIN FLAME ARRESTER
APU FIREWALL FITTING
E
APU Fuel-Feed System - Component Location (Details From Sht 1) Figure 102 (Sheet 3)
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747-400 FAULT ISOLATION/MAINT MANUAL

APU FUEL BOOST PUMP, M713

APU Fuel-Feed System - Component Location (Detail From Sht 1)
Figure 102 (Sheet 4)

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747-400 MAINTENANCE MANUAL
 APU FUEL FEED SYSTEM - MAINTENANCE PRACTICES
____________________________________________
 TASK 28-25-00-872-001
 1.  APU Fuel Feed System Air Removal________________________________
 A. General
 (1)  
Air must be removed from the APU fuel feed system when the No. 2 main tank is defueled. To remove the air, loosen the APU fuel supply line connector in the APU compartment and pressurize the fuel supply line.

 B.
Equipment

 (1)  
Container, 5 U.S. gallon capacity - to hold fuel

 C.
References

 (1)  
AMM 24-22-00/201, Manual Control

 D.
Access

 (1)  
Location Zones
 221 Control Cabin, Left
 317 APU Compartment, Left
 318 APU Compartment, Right

 E.
Procedure

 S 862-002
 (1)  
Make sure the APU master control switch on the P5 pilots' overhead panel is set to OFF.

 (2)
Attach a DO-NOT-OPERATE tag to the APU master control switch.

 (3)
Open the APU access doors and engage the door support rods.

 S 032-004

 (4)  
Put the container below the fuel line connector at the drain bracket, forward of the lower gearbox.

 S 862-014
 S 012-003
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747-400 
MAINTENANCE MANUAL 
APU MASTER 
CONTROL SWITCH 
SEE  A 

A

SEE B
BRACKET INTERFACE CONNECTOR FUEL LINE 
B 
Figure 201 APU Fuel Feed System Purging 

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747-400 MAINTENANCE MANUAL
 (5)  S 032-017Loosen the fuel line connector.
 (6)  S 862-005Remove the DO-NOT-OPERATE tag from the APU master control switch.
 (7)  S 862-006Supply electrical power, if it is not available (AMM 24-22-00/201).
 (8)  S 862-007Set the APU master control switch to ON to the operate fuel boost pump.
 (9)  S 872-008Operate the fuel boost pump until air is removed from the fuel supply line and fuel drips from the fuel line connector.
　
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