Aircraft defuelings are to be performed in the
1. Prior to starting the defuel operation, take sam-
ples of the fuel to be defueled from the aircrafts drains
and visually inspect them for contamination (qualified
squadron personnel under the observation of the
2. Determine the status of the fuel, that is, suspect
or nonsuspect (defuel truck operator). The person re-
questing the defueling operation will confirm that the
fuel is or is not suspect. Fuel is considered suspect if the
aircraft has malfunctioned and the fuel is believed to
have contributed to the problem or the fuel is thought
to be of the wrong type.
3. Determine the amount of fuel to be removed
from the aircraft (defuel truck operator). Again, the
squadron personnel requesting the defueling operation
will provide this estimate as part of the official request.
4. Select the defueling equipment to be used, that
is, defueler for suspect product or refueler/defueler for
nonsuspect fuel (FMO and station operator). Always
check the remaining capacity of the defueler or refu-
eler/defueler to make sure there is adequate room to
hold the fuel being defueled. In addition, remember that
sufficient fuel must be in the defueling tank to maintain
a flooded suction above the anti-vortex splash plate.
5. Position the defueler (defuel truck operator).
6. Verify that the aircraft is spotted properly (all
7. Check for possible sources of ignition (all per-
8. Verify that the defueling request chit corre-
sponds to the instructions from the dispatcher (defuel
9. Connect the bonding wire from the defueler to
the aircraft (defuel truck operator).
10. Unload, position, and connect the defuel hose
to the aircraft and the defueling stub on the defueler
11. Start defueling upon signal from the nozzle
operator (defuel truck operator).
12. Adjust the valve downstream of the pump to
optimize the defuel rate. Maximum defuel rate is 100
gpm (defuel truck operator). When nearing completion
of the defuel process, very close attention should be paid
to the defuel rate to prevent pump cavitation and/or loss
of prime. Discontinue defueling of an aircraft if pump
cavitation is a persistent problem.
13. Upon completion of the defuel operation, se-
cure all equipment and CHECK THE AREA FOR FOD
Disposition of Nonsuspect
Fuel Removed From Aircraft
All USN and USMC aircraft are authorized to use
JP-4, JP-8, commercial JET A and JET A-1, as well as
JP-5 fuel. Fuel removed from a USN or USMC air-
craft will contain mixtures of these fuels, and the
specific grade of fuel will be impossible to determine
without extensive specification testing. USA and
USAF aircraft also may contain such mixtures. There-
fore, fuel in any properly operating DOD aircraft with
turbine engines that is NOT suspect of being contami-
nated can be defueled into a designated refueling
vehicle and then used to refuel any aircraft with the
users knowledge and permission.
First preference will be given to using the fuel to
load an aircraft in the same squadron as that from
which the fuel originated. Second choice will be to
issue the fuel to aircraft having engine fuel controls
that automatically compensate for fuel density
changes. Aircraft with T-56 engines, such as the P-3
and E-2, should be preferentially used since these
engines are the most tolerant to such fuel changes. In
addition, the following roles apply to reissuing defu-
1. Since fuel removed from any aircraft almost
definitely has a flash point below 140°F, it must NOT
be used to refuel any aircraft scheduled for immediate
2. Any designated defuel or refuelers must pass
their fuel through filter/separators and fuel monitors
before reaching the aircraft.
3. The FSII content of defueled turbine fuel must
be checked using the FSII refractometer prior to refuel-
ing S-3 and SH-60 USN aircraft and all U. S. Army and
U.S. Air Force and foreign aircraft.
Nonsuspect fuel that has been dyed for the detec-
tion of aircraft fuel system leaks also can be used in
aircraft provided the above procedures are followed.
Nonsuspect fuel removed from piston engine aircraft
can also be reissued provided