• A fire-fighting unit must& stationed upwind of the aircraft to be defueled. Defueling With Pressure Nozzle Perform the defuel operation as follows: 1. Verify that the aircraft has been grounded. If it hasn’t, connect the ground wire to the deck and then to the aircraft. Ground connections must be made to bare metal. 2. Unreel the hard hose and lead to the aircraft to be defueled. 3. Ensure the quick disconnect continuity switch is in the OFF (defuel) position. 4. Remove the pressure nozzle receptacle cap from the aircraft. 5. Remove the dust cover from the pressure nozzle. 6. Lift the nozzle by the lifting handles; align the lugs on the nozzle with the slots on the aircraft adapter; and hook up the nozzle to the aircraft by pressing it firmly onto the adapter and rotating it clockwise to a positive stop. The nozzle must seat firmly on the adapter and not be cocked. 7. Open the station defuel valve. 8. Start the defuel pump. 9. Defuel the aircraft as directed. 10. Rotate the nozzle flow control handle to the full open position. (The handle must rotate 180 degrees to ensure the poppet valve is fully open and locked by toggle action.) 11. When defueling is complete, shut the nozzle valve by rotating the nozzle flow control handle 180 degrees to shut and locked position. 12. Stop the defuel pump and shut the defuel valve. 13. Disconnect the nozzle from the aircraft. 14. Replace the nozzle receptacle (adapter) cap on aircraft. 15. Replace the dust cover on the pressure nozzle. 16. Remove the ground wire from the aircraft, then the metal deck. 17. Restow the hose. Defueling With Overwing Nozzle If an overwing nozzle is to be used to defuel a drop tank or other similar vessel, the nozzle must first be outfitted with a short length of hose. The bottom of this hose must have notches so suction is not impeded. Defueling procedures using the overwing nozzle are the same as the defueling procedures for the pres- sure nozzle, with the following additions: 1. The overwing nozzles must be grounded to the aircraft (or droptank or other vessel) before the nozzle is inserted. 2. The nozzle must remain in metal-to-metal con- tact with the object being defueled. 3. The nozzle must be physically held open during the defueling evolution. Do NOT block the overwing nozzle in the open position. HANDLING OF AIRCRAFT CONTAINING FUEL OTHER THAN JP-5 Aircraft that have been either land-based or aerial refueled by USAF, USA, commercial airport, or other equipment/facilities must be assumed to contain fuel other than JP-5 in their tanks. The following precau- tions apply: 1. Aircraft recovering aboard the ship with mixed fuels shall notify the first available ship’s controlling authority (strike, marshal, Pri-Fly) prior to recovery. 2. On deck, the aircraft will be marked with a large X across the port and starboard side of the nose. The X will be of ordnance-type tape and will remain on the aircraft until it has been certified that the flash point is 140°F or above. Aircraft will be refueled with JP-5 as soon as possible. 3. Every effort should be made not to park aircraft with low-flash-point fuels on hot catapult tracks. Cata- pult slot seals will be installed before any refueling evolutions commence. 4. Prior to any defuel operation, the aviation fuels officer will ensure the fuel being removed is of satisfac- tory flash point for shipboard storage. CAUTION Fuel with a flash point below 140°F must NOT be defueled into the ship’s system. Ship- board aviation fuel systems are not designed to handle fuel with a lower flash point. The risk of explosion and/or fire will significantly increase if fuel with a low flash point is placed in these systems. 5-22