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
hasnt, connect the ground wire to the deck and then to
the aircraft. Ground connections must be made to bare
2. Unreel the hard hose and lead to the aircraft to
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
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
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
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
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-
1. Aircraft recovering aboard the ship with mixed
fuels shall notify the first available ships 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
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.
Fuel with a flash point below 140°F must
NOT be defueled into the ships 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