(p)
If engine No. 2 engine fuel shutoff valve was opened, close valve on right wing front spar by moving manual override lever to CLOSE position.
(12)
Remove leading edge flap locks (AMM 27-81-0/201).
WARNING: LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONS.
(13)
Drain sump fuel from defueled tank.
(a) Perform steps 2.C.(22) thru 2.C.(26).
3. Transfer Fuel from Tank to Tank
A. General
(1) When only one tank requires defueling, as for leak repair, the fuel can be transferred from one tank into another. The procedure is similar to a tank defueling with the boost pumps operating.
NOTE: Observe fuel quantity limits for each tank when transferring fuel from one tank to another.
B. Transfer Fuel
(1)
Connect external electrical power to airplane (AMM Chapter 24).
NOTE: APU may be used except for total defueling of tank No. 1. Check for minimum fuel and other operational requirements prior to starting APU (AMM 49-11-0/201, Operating Limits).
(2)
On circuit breaker panel P6, make sure that all fuel system circuit breakers are closed.
(3)
Open the ignition circuit breakers on the P6 panel.
(4)
Put the No. 2 start lever to IDLE. This opens No. 2 engine fuel shutoff valve.
(5)
If fuel is to be transferred from tank No. 1 or center tank, put the crossfeed valve switch to OPEN position. If defueling tank No. 2 only, put the switch in CLOSE position.
(6)
Open the fueling station access door (Fig. 201).
(7)
Put the fueling valve switches to OPEN position to check VALVE POSITION LIGHTS.
(8)
Put the fueling valve switch for tank(s) receiving fuel to OPEN position. Make sure the other fueling valve switches are in CLOSE position.
(9)
Open the defueling valve access door and put the defueling valve handle to OPEN position.
(10)
Do step 2.C.(12).
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(a) To operate any of the fuel boost pumps, you must be in the flight compartment to continuously monitor the fuel quantity and the low pressure indication in the fuel tank.
WARNING: DO NOT OPERATE ANY FUEL BOOST PUMP IF THE LOW PRESSURE LIGHT COMES ON AND STAYS ON. FUEL VAPORS IN THE TANK MAY IGNITE AND CAUSE A FIRE OR EXPLOSION.
1) Immediately put the applicable fuel boost pump switch(es) to OFF if the LOW PRESSURE light comes on and stays on.
NOTE: When defueling or transferring fuel with minimum backpressure to the pumps, it is possible for the low pressure light(s) to be on. In this case, monitor the tank quantity and put the pump switch(es) to OFF if the tank quantity is not changing.
(11)
Continue fuel transfer until fuel quantity indicator shows desired quantity of fuel remaining in tank, or until corresponding fuel low pressure warning light comes on. Put the applicable boost pump switches to OFF.
(12)
Close the defueling valve, and close the defueling valve access door. Put the crossfeed valve to CLOSE position.
(13)
Put the fueling valve switches to CLOSE position on the fueling control panel and close the fueling station access door.
(14)
Put the No. 2 start lever to CUTOFF. This closes the No. 2 engine fuel shutoff valve.
(15)
Close the ignition circuit breakers on the P6 panel.
(16)
Remove electrical power if no longer required.
(17)
If draining sump fuel, repeat steps 2.C.(22) thru (26) as applicable.
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DEFUELING VALVE - REMOVAL/INSTALLATION
1. General
A. The defueling valve is composed of three major assemblies; the actuator handle assembly, gate assembly, and the port adapter assembly. The actuator handle assembly and the gate assembly are bolted together. The gate assembly and actuator handle assembly may be removed or installed as an assembled unit. When removing the assembled unit, it is not necessary to defuel the fuel tank. The actuator handle assembly can be removed from the gate assembly and replaced as an independent unit.
B. Replacing the port adapter assembly requires removal of the actuator handle and gate assemblies and complete defueling of No. 2 fuel tank.
2. Removal/Installation of Defueling Valve Actuator Handle Assembly
A. Equipment and Materials
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