(10) Connect the ground cable for the fueling nozzle to the ground jack on the wing.
 NOTE: The ground cable is not necessary if there is electrical
____ continuity between the nozzle and the receptacle.
 S 862-175
 (11)
 Lift the LIFT TO DEFUEL lever in each receptacle adapter.

 S 862-058

 (12)
 Connect the fueling nozzles.

 S 842-059

 (13)
 Prepare the external power control unit (PCU).

 (a)
Remove the cable assemblies from the PCU container.

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747-400
MAINTENANCE MANUAL

DEFUELING POWER CONTROL UNIT F70316
Auxiliary Defueling External Power Control Unit
Figure 202 (Sheet 1)

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747-400
MAINTENANCE MANUAL

DEFUELING POWER CONTROL UNIT CONTROL PANEL

Auxiliary Defueling External Power Control Unit
Figure 202 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 (b)  
Put the PCU on the top of the container with the PCU control panel a minimum of 30 inches above the ground.

 (c)  
Put the container sufficiently near the applicable boost pump to connect the cable to the pump and the PCU.

 (d)  
Make sure all PCU circuit breakers are open.

 (e)  
Make sure all pump switches on the PCU are off.

 S 492-060
 (14)
 Connect the plug, P1, of the -4 cable assembly to the receptacle, J1, of PCU.

 S 492-140

 (15)
 Connect the other end of the -4 cable assembly to the ac and dc connections on the ground power cart or carts.

 F.
Defuel the Center Wing Tank

 S 492-172
 WARNING: USE THE TAIL SUPPORT EQUIPMENT IF YOU CANNOT KEEP THE CENTER OF
_______ GRAVITY IN THE LIMITS GIVEN BY THE WEIGHT AND BALANCE MANUAL. IF THE AIRPLANE CENTER OF GRAVITY IS NOT IN THESE LIMITS, THE AFT END OF THE AIRPLANE CAN HIT THE GROUND.
 (1)  
Install the tail support equipment if you can not keep the airplane center of gravity in the limits given by the weight and balance manual (AMM 07-11-08/201).

 S 652-061

 (2)  
Open the manual shutoff valves for the refuel receptacle.

 S 862-062

 (3)  
Close the manual defueling valves.

 S 982-063

 (4)  
Manually open the jettison valves for the center wing tank.

 S 032-064

 (5)  
Disconnect the electrical connector for the applicable jettison override pump:

 (a)  
M224

 (b)  
M225

 S 032-144
 (6)  
Disconnect electrical connectors for the applicable pressure switches:

 (a)  
S66

 (b)  
S68

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747-400 MAINTENANCE MANUAL
 S 492-065
 (7)  Install the -147 cable assembly. (a) Connect the plug, P2, to the applicable jettison override pump (M224 or M225). (b) Connect the plug, P3, to the applicable pressure switch (S66 or S68). (c) Connect the P2 and the P3 grounds to the airplane grounds. (d) Connect the plug, P1, to the receptacle, J4, of the PCU.
　
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