TM 55-1510-222-10 before filling the corresponding auxiliary tanks. d. Secure applicable fuel tank filler cap.  Make sure latch tab on cap is pointed aft. e. Disconnect bonding cables from aircraft. 2-91.  DRAINING MOISTURE FROM FUEL SYSTEM. Twelve   (12)   fuel   drains   are   installed   (plus   two drains   for   the   ferry   fuel   system,   when   installed)   to remove sediment from the fuel system. 2-92.  FUEL TYPES. Approved fuel types are as follows: a. Army Standard Fuels.  Army standard fuel is JP-4. b. Alternate   Fuels,   Army   Alternate   fuels   are JP-5 and JP-8. c. Emergency  Fuel.    Avgas  is  an  emergency fuel and subject to 150 hour time limit. 2-93.  USE OF FUELS. Fuel is used as follows: a. Fuel     limitations. Fuel limitations are outlined in Chapter 5.  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,   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 having   a   freezing   point   of   -40°   C   (-40°   F),   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-4  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  usually occurs  during  cross-country  flights  where  aircraft  using NATO F-44 (JP-5) are refueling with NATO F-40 (JP-4) or  Commercial  ASTM  Type  B  fuels.    Whenever  this condition   occurs,   the   engine   operating   characteristics may change in that lower operating temperature, slower acceleration,  lower  engine  speed,  easier  starting,  and shorter range may be experienced.  The reverse is true when  changing  from  F-40  (JP-4)  fuel  to  F-44  (JP-5)  or Commercial  ASTM  Type  A-I  fuels.    Most  commercial turbine    engines    will    operate    satisfactorily    on    either kerosene  or  JP-4  type  fuel.    The  difference  in  specific gravity may possibly require fuel control adjustments; if so,  the  recommendations  of  the  manufacturers  of  the engine and airframe are to be followed. 2-94.  SERVICING OIL SYSTEM. An  integral  oil  tank  occupies  the  cavity  formed between    the    accessory    gearbox    housing    and    the compressor  inlet  case  on  the  engine.    The  tank  has  a calibrated   oil   dipstick   and   an   oil   drain   plug.      Avoid spilling     oil.          Any     oil     spilled     must     be     removed immediately.      Use   a   cloth   moistened   in   solvent   to remove  oil.    Overfilling  may  cause  a  discharge  of  oil through  the  accessory  gearbox  breather,  during  engine operation  until,  a  satisfactory  level  is  reached.  Service oil system as follows: 1. Open  the  access  door  on  the  upper cowling to gain access to the oil filler cap and dipstick. CAUTION A   cold   oil   check   is   unreliable.      If possible,  check  oil  within  10  minutes after   engine   shutdown.      If   over   10 minutes     have     elapsed,     motor     the engine for 40 seconds, then check.  If over  10  hours  have  elapsed,  start  the engine   and   run   for   2   minutes,   then check.    Add  oil  as  required.    Do  not overfill. 2. If oil level is over 2 quarts low, motor or run  engine as required, and service as necessary. 3. Remove oil filler cap. 4 Insert  a  clean  funnel,  with  a  screen incorporated, into the filler neck. 5. Replenish   with   oil   to   within   1   quart below MAX mark or the MAX COLD on dipstick 2-85