28-31-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
90000
80000
70000
60000
50000
40000
30000
20000
10000
0
FUEL LOAD - POUNDS
PITCH ATTITUDE - DEGREES
LEFT OVERRIDE/JETTISON PUMP (CENTER WING TANK)
NOTE: THE FUEL QUANTITIES SHOWN ARE APPROXIMATE VALUES.
+ ROLL IS LEFT WING UP.
MINIMUM FUEL QUANTITY THAT IS NECESSARY TO PRIME THE OVERRIDE/JETTISON PUMP WITHOUT THE WETTING SYSTEM.
MINIMUM FUEL QUANTITY THAT IS NECESSARY TO PRIME THE
OVERRIDE/JETTISON PUMP WITH THE WETTING SYSTEM.
Pump Priming for the Override/Jettison Pumps in the Center Wing Tanks
Figure 405 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-31-01
ALL ú ú 01 Page 431 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C65801
A
747-400
MAINTENANCE MANUAL
FUEL LOAD - POUNDS
90000
80000
70000
60000
50000
40000
30000
20000
10000
0
PITCH ATTITUDE - DEGREES
RIGHT OVERRIDE/JETTISON PUMP (CENTER WING TANK)
NOTE:THE FUEL QUANTITIES SHOWN ARE APPROXIMATE VALUES.
+ ROLL IS LEFT WING UP.
MINIMUM FUEL QUANTITY THAT IS NECESSARY TO PRIME THE OVERRIDE/JETTISON PUMP WITHOUT THE WETTING SYSTEM.
MINIMUM FUEL QUANTITY THAT IS NECESSARY TO PRIME THE OVERRIDE/JETTISON PUMP WITH THE WETTING SYSTEM.
Pump Priming for the Override/Jettison Pumps in the Center Wing Tanks
Figure 405 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-31-01
ALL ú ú 01 Page 432 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C85980
A
747-400
MAINTENANCE MANUAL
(3)
If the fuel quantity in the center wing tank is below the Figure 405 LEVEL 1 fuel quantity, use the wetting system to help prime the center wing tank pumps.
(4)
If the fuel quantity in the center wing tank is above the Figure 405 LEVEL 1 fuel quantity, it is not necessary to use the wetting system.
NOTE: Fuel head pressure in the center wing tank will help prime
____ the pump when the center tank pumps are operated.
B. References
(1)
AMM 12-11-01/301, Fuel Servicing
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 28-26-00/201, Defuel
(4)
AMM 32-00-30/201, Landing Gear Door Locks
(5)
SSM 28-31-02, 28-31-04
(6)
WDM 28-31-21, WDM 28-31-22, WDM 28-31-23, WDM 28-31-24,
WDM 28-31-25, WDM 28-31-26
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.
Prepare the Override/Jettison Pump for the Operational Test
S 864-031
(1)
Supply electrical power, if it is not available (AMM 24-22-00/201).
S 864-032
(2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(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
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