Anti-icing and Biocidal Additive for Commercial Turbine Engine Fuel The fuel system icing
inhibitor shall conform to MIL-I-27686. The additive provides anti-icing protection and also
functions as a biocide to kill microbial growths in aircraft fuel systems. Icing inhibitor conforming
to MIL-I-27686 (PRIST) shall be added to commercial fuel, not containing an icing inhibitor, during
refueling operations, regardless of ambient temperatures. Refueling operations shall be
accomplished in accordance with accepted commercial procedures.
Table 2-14. Approved Military Fuels, Oil, Fluids, and Unit Capacities
MIL-T-5624 (JP-5 and JP-8)
544 U.S. Gallons usable
14 U.S. Quarts per engine
Hydraulic brake reservoir
1 U.S. Pint
Hydraulic landing gear reservoir*
8 U.S. Quarts
49 Cubic feet
MIL-L-23699 oil, used in engine oil system, is authorized and directed for use . Do not mix different
brands or types of oil when adding oil between changes. Different brands or types of oil may be
incompatible due to the differences in chemical structure.
Table 2-15. Standard, Alternate, and Emergency Fuels
Grade JP -8
Grade JP -5
Any AV Gas
* Maximum operating hours with indicated fuel between engine overhauls (TBO).
2-105. USE OF FUELS.
a. Fuel Use Limitations. There is no special
limitation on the use of Army standard fuel, but certain
limitations are imposed when alternate or emergency
fuels are used. For the purpose of recording, fuel
mixtures shall be identified as to the major component
of the mixture, except when the mixture contains
leaded gasoline. The use of any fuels other than
standard will be entered in the FAULTS/REMARKS
column of DA Form 2408-13-1, Aircraft Maintenance
and Inspection Record, noting the type of fuel,
additives, and duration of operation.
b. Use Of Kerosene Fuels. The use of
kerosene fuels (JP -5 type) in turbine engines dictates
the need for observance of special precautions. Both
ground starts and air restarts at low temperature may
be more difficult due to low vapor pressure. Kerosene
fuels have a freezing point of minus 40 °C (-40 °F) and
limit the maximum altitude of a mission to 28,000 feet
under standard day conditions.
c. Mixing Of Fuels In Aircraft Tanks. When
changing from one type of authorized fuel to another,
for example JP-8 to JP-5, it is not necessary to drain
the aircraft fuel system before adding the new fuel.
d. Fuel Specifications. Fuels having the same
NATO code number are interchangeable. Jet fuels
conforming to ASTM D -1655 specification may be
used when MIL-T-5624 fuels are not available. This