28-31-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (7)  
WDM 28-31-25, WDM 28-31-26

 B.
Equipment

 (1)  
Container - 1-quart capacity to collect fuel

 (2)  
MS35275-250 - Screw, Motor/Impeller Retention (Quantity 2)

 C.
Access

 (1)  
Location Zones
 135 Wing Landing Gear Well, Left
 136 Wing Landing Gear Well, Right
 571 Rear Spar to Landing Gear Support Beam, Left
 671 Rear Spar to Landing Gear Support Beam, Right

 D.
Procedure

 S 864-002
 (1) Make sure the ground lockpins for the landing gear are installed.
 S 494-003
 WARNING: DO THE PROCEDURE IN AMM 32-00-30/201 TO INSTALL THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Install the door locks for the wing and body gear
 (AMM 32-00-30/201).

 S 864-004

 (3)  
Open these applicable circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P180 DC Power Distribution Panel
 1) 180E3 FUEL OVRD/JTSN PMP CONT FWD 2&3
 2) 180E18 FUEL OVRD/JTSN PMP CONT AFT 2&3
 3) 180E2 FUEL OVRD/JTSN PMP CONT CTR L
 4) 180H18 FUEL OVRD/JTSN PMP CONT CTR R

 (b)  
P414 Power Distribution Center - Left
 1) 414D2 FUEL OVRD/JTSN PUMP CTR LEFT
 2) 414C2 FUEL OVRD/JTSN PUMP FWD 2

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-31-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

OVERRIDE/JETTISON PUMP
SEE A
REAR
SPAR DISCHARGE LINE
YDMM-LTF-00-0001-P(M)
PUMP INLET LINE
MOUNTING BOLT (8 LOCATIONS) (DO NOT REMOVE)
2.  ELECTRICAL
YDMM-28-31-0012-D l17053 CONNECTOR
10. PACKING
3.  PRESSURE SWITCH
9. COUPLING
1. PACKING
HOUSING 4.  MOTOR/IMPELLER UNIT
B
ELECTRICAL BOND SURFACE
8. PACKING
SEE  B  5. PUMP 
PACKING6. 7. PACKING  A  CONNECTOR ELECTRICAL 
B 

A
OVERRIDE/JETTISON PUMP
AIRPLANE
ELECTRICAL WIRING
A
FWD
____PUMP WITH A FACE MOUNT ELECTRICAL CONNECTOR SHOWN.
NOTE: CWT AND OUTBOARD MAIN 2 AND 3 PUMP INSTALLATION SHOWN. INBOARD MAIN 2 AND 3 PUMP INSTALLATION SIMILAR.
Fuel Override/Jettison Pump Motor/Impeller Unit Figure 401 (Sheet 1)
L24195
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-31-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
HOUSING MOUNTING BOLT (8 LOCATIONS)
LOCKWIRE
11. BONDING (INSTALLED ON BOLTS
JUMPER WITH LOCKWIRE PROVISIONS)
5. PUMP 
ELECTRICAL 
PULL HERE FOR  CONNECTOR 
PUMP REMOVAL 
15. BONDING 
CLIP 

11. BONDING
13.
DRAIN PLUG

JUMPER
14.
PACKING

12. BONDING (NOT SHOWN)
CLIP LOCKWIRE
(AIRPLANES WITH A FACE MOUNTED ELECTRICAL CONNECTOR)
(INSTALLED ON BOLTS
WITH LOCKWIRE
PROVISIONS) HOUSING MOUNTING BOLT
A-A
11. BONDING (8 LOCATIONS)JUMPER
5.  PUMP ELECTRICAL CONNECTOR
15. BONDING
CLIP AIRPLANE ELECTRICAL
HANDLE  WIRING
13. DRAIN PLUG 16. BONDING
14. PACKING
12. BONDING  JUMPER (NOT SHOWN) CLIP
11. BONDING JUMPER
(AIRPLANES WITH A BRACKET MOUNTED ELECTRICAL CONNECTOR) A-A
　
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