TM 1-1510-218-10 2-129 usually    occurs    during    cross-country     flights    where aircraft   using   NATO   F-44   (JP -5)   are   refueled   with NATO F-40 (JP-8) 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-8) fuel  to  F-44  (JP-5)   or   Commercial   ASTM   Type   A-1 fuels.    Most  commercial  turbine  engines  will  operate satisfactorily on either kerosene or JP -8 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. 2-106.  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 tanks have 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     until     a satisfactory level is reached.   Refer to Figure 2-33 for aircraft servicing locations. 1.   Open  the  access  door  on  the  upper  rear cowling  to  gain  access to the oil filler cap and dipstick. CAUTION A  cold  oil  check  is  unreliable.    Oil  should be checked within 10 minutes after stopping engine.  If more than 10 minutes have   elapsed,   run   engine   for   2   minutes, then  recheck.   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 (cold  engine).    Fill to   MAX or   MAX  HOT (hot engine). 6.   Check oil filler cap for damaged preformed packing, general condition, and locking. CAUTION Ensure    that    oil    filler    cap    is    correctly installed   and   securely   locked   to   prevent loss of oil and possible engine failure. 7.   Install and secure oil filler cap. 8.   Check for any oil leaks. 2-107.  SERVICING THE HYDRAULIC SYSTEM. a.   Servicing Hydraulic Brake System Reservoir. 1.   Gain   access   to   brake   hydraulic   system reservoir. 2.   Remove     brake     reservoir     cap     and     fill reservoir to washer on dipstick with hydraulic fluid. 3.   Install brake reservoir cap. b.  Servicing Hydraulic Landing Gear System   D2    T   .    Servicing  the  hydraulic  landing  gear  system consists   of   maintaining   the   correct   fluid   level   and maintaining  the  correct  accumulator  precharge.    The accumulator  is  located  in  the  reservoir  access  area and is charged to 800 ± 50 psi using bottled nitrogen.   A  charging  gauge  is  mounted  on  the  accumulator.   A reservoir,  located  just  inboard  of  the  LH  nacelle  and forward  of  the  main  spar,  has  a  lid  with  a  dipstick attached marked   FLUID  TEMP  0  °F,  50  °F,  100  °F.   Add MIL-H-5606 hydraulic fluid (consumable materials list)    as    required    to    fill    the    system    corrected    for temperature. (1)   Shock Struts.   Servicing the shock struts is  part  of  each  100-hour  inspection  procedure.    If  it becomes necessary to service the shock struts due to the  leakage  of  either  the  hydraulic  oil  or  the  air,  the following procedures should be followed. (2)   Nose Gear Strut. 1.   Release all of the air from the strut by pressing the   core  of  the  air  valve  on top of the strut. 2.   Remove the air valve and wipe clean.   With   the   strut   fully   compressed,   the end  of  the  filler  neck  on  the  air  valve should touch the oil.  If the oil is below this    level,    add    approved    hydraulic fluid.      Reinstall   and   safety   the   air- valve.