S 862-085
(13)
Close the circuit breakers, A (CB 4) and B (CB 3).
S 862-086
(14)
Set the switches, S4 and S3, to ON.
S 682-158
(15)
Make sure the low pressure lights (L5 and L6) come on momentarily until the pump pressure increases.
S 682-113
(16)
Continue to defuel until the low pressure light, L5 or L6, comes on.
S 862-112
(17)
Set the applicable switch, S4 or S3, to OFF.
S 862-149
(18)
Open the applicable circuit breaker, A or B.
(19)
Close the crossfeed valves.
(20)
Close the transfer valves for the reserve tank.
(21)
Close the manual defueling valves.
(22)
Disconnect the -5, -10, and -15 cable assemblies.
S 862-087
S 862-181
S 862-148
S 092-088
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-26-00
ALL ú ú 06 Page 232 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 432-186
(23)
Connect the electrical connector for the applicable boost pump or pumps (M22, M23, M26, M27, M28, M29, M31 or M32).
S 432-187
(24)
Connect the electrical connector for the applicable pressure switches (S62, S63, S64, S65, S69, S70, S71, or S72).
H.
Put the Airplane Back to Its Usual Condition
S 092-107
(1)
Remove the external power control unit (PCU) from the airplane.
(a)
Push the MSTR PWR OFF switch.
(b)
Open the circuit breakers, CB 1 and CB 2.
(c)
Disconnect the -4 cable assembly from the ground power cart and from the PCU.
(d)
Put the cable assemblies and the PCU in their container.
S 862-108
(2) Disconnect the defueling hose and the ground cable (if it is installed).
S 862-219
WARNING: MAKE SURE YOU PUT THE LEVER IN THE RECEPTACLE ADAPTER BACK TO
_______ ITS CORRECT POSITION. A FUEL LEAK CAN OCCUR WHICH CAN CAUSE A DANGEROUS CONDITION FOR EQUIPMENT AND PERSONS.
(3)
Put the lever in each receptacle adapter back to its correct position.
(4)
Install the refuel receptacle caps.
(5)
Close the access doors for the refuel station.
S 092-173
(6)
Remove the tail support equipment, if it is not necessary for subsequent tasks (AMM 07-11-08/201).
S 432-109
S 412-129
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
TASK 28-26-00-652-211
5. Lateral Fuel Imbalance Limits (Fig. 203, 204, 205)_____________________________
A. General
(1)
When defueling or during tank to tank fuel transfer, if all the tanks are not defueled for maintenance operations, lateral fuel imbalance could occur. To prevent lateral fuel imbalance, use the limits in this procedure.
(2)
The graphs in this task are for static maintenance operations only. Use the weight and balance manual for ground and flight operations.
(a)
If you must move (taxi or tow) the airplane for ground operations, use the lateral imbalance limits in the applicable weight and balance manual.
B.
Access
(1)
Location Zones
500 Left Wing
600 Right Wing
C.
Procedure
S 652-212
(1)
Make sure there is no imbalance other than fuel (for example: no cargo lateral imbalance).
S 652-213
(2)
Make sure you keep the airplane in the weight and longitudinal center of gravity limits given by the weight and balance manual.
S 652-214 中國航空網(wǎng) www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊(cè) 燃油 FUEL 3(125)
