14. When the hose is fully charged, rotate the nozzle flow control handle to the FULL OPEN position. The handle must rotate 180 degrees to insure that the poppet valve is fully open and locked. 15. Once fuel flow has been established, squadron personnel will exercise the aircraft’s pre-check system. NOTE The pre-check system simulates the com- pletion of refueling by closing all the tank shut- off valves within the aircraft. All fuel flow into the aircraft should stop within a few seconds to 1 minute of actuating the pre-check system. The primary means of detecting successful pre- check is by observing the flow indicator on the aircraft. If the aircraft is not configured with the indicator, an alternate method is to observe the jerk and stiffening of the refueling hose and/or the pressure spike that occurs at the refueling station. If an aircraft fails pre-check, it can be cold refueled only if procedures are called out in that specific aircraft’s NATOPS. 16. Fuel the aircraft as directed by the flight plan. The plane captain will monitor aircraft vents, tank pres- sure gauge(s) and/or warning lights as necessary. The plane caption is also responsible for ensuring that the aircraft is fueled to the correct fuel load. 17. When directed by the plane captain, rotate the nozzle flow control handle to the OFF and fully locked position. 18. Place the quick-disconnect switch in the OFF position. This deenergizes the solenoid-operated pilot valve (SOPV) and places the Cla-Val in the defueling position. 19. When the hose is evacuated, disconnect the nozzle from the aircraft adapter, replace the adapter cap, and remove the ground wire from the aircraft, then the deck. 20. Move to next aircraft to be fueled. After all aircraft have been fueled, secure the refueling station. 21. Restow the hose. NOTE Aircraft Pressure Refueling With Engines Operating (Hot Refueling) Hot refueling procedures are the same as the Cold Refueling procedures listed above except for the fol- lowing additions and precautions: 1. The aircraft pilot will select fuel loading, ensure that the cockpit switches are in the proper positions, and maintain UHF radio contact with Primary (Air Boss). 2. The pilot will secure all electronic and electrical equipment not required for refueling. 3. The pilot will place all armament switches in the SAFE position. 4. The aircraft must NOT be hot refueled if it fails pre-check. Failure of the pre-check indicates a malfunc- tion in the aircraft’s fuel system, which can result in a fuel spill and fire. 5. The aircraft canopy and helicopter side doors will remain closed during the entire fueling evolution. 6. Be extra cautious around intakes and exhausts. Assume both engines on a dual-engine aircraft are op- erating. Although some aircraft can and do shut down the engine on the side where the refueling adapter is located (F-14), most aircraft currently do not (F-18, A-6). 7. Pilot-in-command changes are not permitted during refueling operations. 8. No static samples are to be taken during hot refueling. Hot refueling is performed with the pres- sure nozzle only. Overwing Refueling Overwing (gravity) refueling can be performed only with the engines off. Overwing refueling proce- dures are the same as cold refueling procedures, ex- cept for the following additions: CAUTION Fueling with an overwing nozzle requires skill and patience because of the increased chance for a spill. ALWAYS use extreme cau- tion when fueling this way and NEVER block the overwing nozzle in the open position. 1. Overwing nozzles must be grounded to the aircraft (or support equipment) prior to inserting the nozzle. 2. After inserting the nozzle in the fueling recep- tacle, make sure metal-to-metal contact between the nozzle and the fueling port is maintained throughout the fueling operation. 5-20