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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
UNIT OF FUEL METERINBOARD SIDE  ING 
1.  TUBE NUT  SEE  D 
TRANSMITTER FUEL FLOW ADAPTER FOR  SEE  B 
SEE SUPPLY HOSE  A  SEE  C  2.  DISTRIBUTION FOR FUEL VALVE SUPPLY TUBE 

FOR MAIN FUEL (REF)
3. CLAMP FOR EEC WIRING HARNESS
3A. CLAMP
4A. BOLT
4.
 BOLT

5.  
FUEL METERING UNIT, M3108

TUBE NUT
SEE B
6A. ELECTRICAL
6.  ELECTRICAL
FUEL CONNECTOR, CONNECTOR,
PUMP W5P1 11. BOLT W4P2
10. CLAMP FWD
A
11A. BOLT
2.  SUPPLY TUBE FOR FUEL DISTRIBUTION 9A. CLAMP
8.  PACKING
VALVE RETAINER
7.
OIL RETURN TUBE FOR THE AIR/OIL HEAT EXCHANGER OF IDG
1.  TUBE NUT
2. SUPPLY TUBE FOR FUEL DISTRIBUTION
(EXAMPLE 2 LOCATIONS)  12. NUT VALVE HPC BRACKET
9. CLAMP
B  L-A6242
C
12A. NUT  0490
Fuel Metering Unit Installation Figure 401 (Sheet 1)
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31. ELECTRICAL CONNECTOR, DM3108
MANIFOLD TEE FOR FUEL SUPPLY
25. TUBE NUT
5.  FUEL
METERING
UNIT, M3108

SEE E
23. PACKING
21. TUBE FOR
FUEL SUPPLY

22. ADAPTER
20. TUBE NUT
5.  FUEL METERING UNIT, M3108
FWD
E
16. NUT
15. WASHER (5 LOCATIONS)
(5 LOCATIONS)

FUEL PUMP
32. PACKING
14. PACKING
FUEL BYPASS VALVE
33. PACKING 17. PACKING
34. TRANSFER
TUBE

18. PLUG
35. RETAINER 19. TUBE NUT 13. PACKING FWD L-A2336 (0201)
D
26.
PACKING

27. ADAPTER
28.
BOLT (3 LOCATIONS)

29.
 BOLT

30.
BRACKET

Fuel Metering Unit Installation
Figure 401 (Sheet 2)

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
E. Prepare to Remove the FMU
 S 864-069-N00
 (1)  
Supply the electrical power (AMM 24-22-00/201).

 S 864-064-N00

 (2)  
Make sure the applicable FUEL CONTROL switch is in the CUTOFF position.

 (a)  
Install the DO-NOT-OPERATE tag.

 S 864-070-N00
 (3)
Push the STAT button on the select panel for the EICAS display.

 S 864-072-N00

 (4)  
Make sure the status page shows on the auxiliary EICAS.

 S 864-071-N00

 (5)  
Make sure the applicable status message of the FUEL SPAR VLV 1, 2, 3, or 4 does not show.

___
 S 864-073-N00
 WARNING: MAKE SURE YOU OPEN THE APPLICABLE CIRCUIT BREAKERS OF THE
_______ ENGINE IGNITION BEFORE YOU OPEN THE ENGINE CIRCUIT BREAKER FOR THE FUEL CONT VALVE. THE IGNITER PLUGS CAN START THE IGNITION AUTOMATICALLY IF YOU DO NOT OPEN THE CIRCUIT BREAKERS. IF THE CUMBUSTION CHAMBER HAS FUEL IN IT, AN INTERNAL ENGINE FIRE OR A TAILPIPE FIRE CAN OCCUR. THE FIRE CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE ENGINE.
 (6)  
For the applicable engine, open these circuit breakers and attach the DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel
 1) 6F01, IGN 1 ENG 1
 2) 6G19, STBY IGN ENG 1
 3) 6K19, IGN 2 ENG 1
 4) 6F02, IGN 1 ENG 2
 5) 6G20, STBY IGN ENG 2
 6) 6K20, IGN 2 ENG 2
 7) 6F03, IGN 1 ENG 3
 8) 6G21, STBY IGN ENG 3
 9) 6K21, IGN 2 ENG 3
 10) 6F04, IGN 1 ENG 4
 11) 6G22, STBY IGN ENG 4
 12) 6K22, IGN 2 ENG 4
　
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