(10)
Push the MSTR PWR ON switch and release it.
S 212-068
(11)
Make sure the MASTER POWER ON light comes on.
S 862-069
(12)
Close the CONTROL (CB 7) circuit breaker on the PCU.
S 652-070
(13)
Set the switch, S7, to ON.
S 652-145
(14)
Make sure the low pressure light (L9) comes on momentarily until the pump pressure increases.
NOTE: You can use the suction pump on the fuel truck to help to
____ defuel the tank.
S 652-071
(15)
Continue to defuel until the low pressure light, L9, comes on.
S 862-072
(16)
Set the switch S7 to the OFF position.
S 862-167
(17)
Open the circuit breaker, CONTROL (CB 7) on the PCU.
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747-400 MAINTENANCE MANUAL
S 032-073
(18)
Disconnect the -147 cable assembly.
S 432-184
(19)
Connect the electrical connector for the applicable jettison override pump:
(a)
M224
(b)
M225
S 432-185
(20)
Connect the electrical connectors for the applicable pressure switches:
(a)
S66
(b)
S68
S 862-074
(21)
Close the manual shutoff valves on the fueling receptacles.
G.
Defuel the Main Tanks and the Reserve Tanks
S 862-075
(1)
Open the applicable crossfeed valves.
S 982-077
(2)
Open the manual defueling valve or valves.
S 862-180
(3)
Open the transfer valves for the reserve tanks.
S 032-078
(4)
Disconnect the electrical connector for the applicable boost pump or pumps (M22, M23, M26, M27, M28, M29, M31 or M32).
S 032-146
(5)
Disconnect the electrical connector for the applicable pressure switches (S62, S63, S64, S65, S69, S70, S71, or S72).
S 492-079
(6)
Install the -10 cable assembly.
(a)
Connect the plug, P2, to the applicable pressure switch.
(b)
Connect the P2 ground to the airplane ground.
S 492-147
(7)
Install the -15 cable assembly.
(a)
Connect the plug, P2, to the applicable boost pump.
(b)
Connect the P2 ground to the airplane ground.
S 492-080
(8)
Install the -5 cable assembly.
(a)
Connect the P4 and the P5 connectors to the P1 connector of the -10 cable assembly.
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A
747-400
MAINTENANCE MANUAL
(b)
Connect the P2 and P3 connectors to the P1 connector of the -15 cable assembly.
(c)
Connect the plug, P1, to the receptacle, J2, of the PCU.
S 862-081
(9)
Close these circuit breakers on the PCU:
(a)
CB 1 (115 V AC)
(b)
CB 2 (28 V DC)
S 212-082
(10)
Make sure these lights come on:
(a)
28 V DC AVAIL
(b)
115 V AC AVAIL
(c)
PH SEQ
S 862-084
(11)
Push the MSTR PWR ON switch and release it.
S 212-083
(12) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 燃油 FUEL 3(124)
