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U.S. GALLONS) OR 762 KILOGRAMS (950 LITRES) OF FUEL. HYDRAULIC SYSTEM OVERHEATING WILL RESULT IF HEAT EXCHANGER IS NOT SUBMERGED IN FUEL.
B.  All tanks may be defueled separately or simultaneously. If selective defueling is performed (single tank only), consideration should be given to the possibility of fuel or fuel vapor carryover into the defueled tank from tank(s) still containing fuel.
2.  Fuel Tank Defueling
A.  General
(1)  Defueling is done in one of several ways depending on whether ground electrical supply power equipment is available or whether airplane APU can be used, or whether complete avoidance of airplane electrical system is necessary. Four methods of defueling are covered, the first three are listed in order of most rapid method for simultaneous defueling of all tanks with the first listed being the most rapid. The fourth method is a selective (single tank) method utilizing a special piece of ground support equipment which provides for powering up individual airplane fuel tank boost pumps after removing them from the onboard wiring circuits. The four methods are as follows:
(a)  
Defuel through pressure fueling receptacle using airplane boost pumps and fueling truck defueling (suction) pump.

(b)  
Defuel through pressure fueling receptacle using airplane boost pumps only.

(c)  
Defuel through pressure fueling receptacle using fuel truck defueling (suction) pump only. 1) This method is not recommended as it is very slow.

(d)  
Defuel through pressure fueling receptacle using auxiliary defueling external power control unit. 1) Refer to par. 2.B.(7), Equipment and Material for identification of special ground

support equipment required.
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(2)  
With pressure defueling (boost pumps operating), or a combination of pressure and suction, all fuel tanks can be defueled to sump drain valve level.

(3)  
Normal defueling is done with the airplane in normal attitude (0-degree roll, 1-degree nose down).

(4)  
All valves may be opened or closed manually if desired. For method identified in par. 2.A.(1)(d) above, manual operation of valves is mandatory.

B.  Equipment and Materials
(1)  
Fuel Truck or equivalent fuel servicing facility (must be equipped with suction pump if suction defueling is used)

(2)  
Leading Edge Flap Actuator Locks - F80048-89 (Preferred), F80048-90 (Preferred) -Included in kit F480048-95 F80048-36 (Alternate) - Included in kit lock assy, flap, and slats F480048-78

(3)  
Sump Fuel Drain Hose Adapter (Fig. 203) - B28002-1 (preferred); SE28-1105 (alternate)

(4)  
Fuel drain hose to fit hose adapter (Fig. 203)

(5)  
Center wing tank sump drain tool (Fig. 203)

(6)  
Fuel Dripstick Operating Tool - F72949

(7)  
Auxiliary Defueling External Power Control Unit - F70316-1 (used only for defueling method listed in par. 2.F)

C.  Defuel through Pressure Fueling Receptacle Using Airplane Boost Pumps and Fueling Truck Defueling (Suction) Pump
NOTE:  Boost pumps must be operating.
(1)  Ensure the airplane is grounded (Ref 20-40-11 MP, Static Grounding).
WARNING:  MAKE SURE THE AIRPLANE AND THE FUELING TRUCK ARE ELECTRICALLY BONDED BEFORE FUELING OR DEFUELING. MAKE SURE THE AIRPLANE AND ALL WORK STANDS IN USE ARE GROUNDED AND BONDED BEFORE DOING FUEL TANK OR FUEL SYSTEM MAINTENANCE. REFER TO THE PARAGRAPH ON STATIC GROUNDING PROCEDURE. CORRECT ELECTROSTATIC GROUNDING AND BONDING PREVENTS STATIC ELECTRICITY DISCHARGES AND POSSIBLE FIRE OR EXPLOSION.
(a)  
Connect a grounding cable from the fueling vehicle and other fuel equipment being used for tank maintenance to an approved and identified static ground.

(b)  
Connect a bonding cable from the fueling vehicle to an approved electrical grounding or bonding connection on the airplane.

NOTE:  If the fueling vehicle has a permanently attached V or Y grounding cable, connect one part of the V or Y to an approved, identified ground. Then connect the other part of the V or Y cable to an approved electrical bonding or grounding point on the airplane.
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(2)  
Connect electrical power to airplane (Ref 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 (Ref 49-11-0 MP, Operating Limits).

(3)  
On circuit breaker panel P6, check that all fuel system circuit breakers are closed.
　
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