TM 1-1510-218-10 2-128 NOTE 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 SYSTEM SPECIFICATION CAPACITY Fuel MIL-T-5624 (JP-5 and JP-8) 544 U.S. Gallons usable Engine Oil MIL-L-23699 14 U.S. Quarts per engine Hydraulic brake reservoir MIL-H-5606 1 U.S. Pint Hydraulic landing gear reservoir* MIL-H-5606 8 U.S. Quarts Oxygen MIL-O-27210 49 Cubic feet Toilet Chemical Monogram DG-19 3 Ounces D2 T NOTE 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 EMERGENCY FUEL ENGINE ARMY STANDARD FUEL ALTERNATE FUEL TYPE *MAX. HOURS PT6A MIL-T-5624 MIL-T-5624 MIL-G-5572 150 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