Chapter 11. Safety, Ground Operations, & Servicing Defueling Defueling procedures differ with different types of aircraft. Before defueling an aircraft, check the maintenance/ service manual for specific procedures and cautions. Defueling can be accomplished by gravity defueling or by pumping the fuel out of the tanks. When the gravity method is used, it is necessary to have a method of collecting the fuel. When the pumping method is used, care must be taken not to damage the tanks, and the removed fuel should not be mixed with good fuel. General precautions when defueling are: Ground the aircraft and defueling equipment. Turn off all electrical and electronic equipment. Have the correct type of fire extinguisher available. Wear eye protection.

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