TM 1-1510-218-10 8A-25 a.     Preparation  for  Flight.    Check  the  position of  the  aircraft  in  relation  to  other  aircraft.    Propeller sand blast can damage closely parked aircraft.  Check that the landing gear shock struts are free of dust and sand.  Check the instrument panel and general interior for dust and sand accumulation.  Open main entrance door  and  cockpit  vent  storm  windows  to  ventilate  the aircraft. CAUTION N₁    speeds    of    70%    or    higher    may    be required   to   keep   oil   temperatures   within limits. b.    Engine Starting.  Use normal procedures in Section  II.    Engine  starting  under  conditions  of  high ambient   temperatures   may   produce   a   higher   than normal ITT/TGT during the start.  The ITT/TGT should be   closely   monitored   when   the   condition   lever   is moved to the LOW IDLE position.  If over temperature tendencies are encountered, the condition lever should be   moved   to   IDLE    CUTOFF    position    periodically during  acceleration  of  gas  generator  RPM  (N₁).    Be prepared    to    abort    the    start    before    temperature limitations are exceeded. c.     Before   Taxi   and   Engine   Runup.      Use normal   procedures   in   Section   II.      To   minimize   the possibility of damage to the engines during dusty/sandy conditions, activate ice vanes.  When the engine runup areas are slippery, the crew may not be able    to    safely    accomplish    the    runup    procedures without  causing  the  aircraft  to  begin  sliding.    Under those conditions, the pilot on the controls must use his judgment to determine which runup procedures will be accomplished. d.    Taxiing. Use normal procedures in Section II.    When  practical,  avoid  taxiing  over  sandy terrain   to   minimize   propeller    damage   and   engine deterioration   that  results  from  impingement  of   sand and    gravel.        During    hot    weather    operation,    use minimum braking action to prevent brake overheating. e.     Takeoff. Use normal procedures in Section II.    Avoid  taking  off  in  the  wake  of  another aircraft if the runway surface is sandy or dusty. f. During  Flight.    Use  normal  procedures  in Section II. g.    Descent.          Use     normal     procedures     in Section II. h.    Landing.          Use     normal     procedures     in Section II. i. Engine Shutdown.  Use normal procedures in Section II. CAUTION During    hot    weather,    if    fuel    tanks    are completely     filled,     fuel     expansion     may cause    overflow,    thereby    creating    a    fire hazard. j. Before    Leaving    Aircraft.        Use    normal procedures   in   Section   II.      Take   extreme   care   to prevent  sand  or  dust  from  entering  the  fuel  and  oil system during servicing.  During hot  weather, release the brakes immediately after installing wheel chocks to prevent brake disc warpage. 8A-58.  TURBULENCE AND THUNDERSTORM OPERATION. CAUTION Due     to     the     comparatively     light wing loading,  control  in  severe  turbulence  and thunderstorms is critical.  Since turbulence imposes     heavy     loads     on     the     aircraft structure,  make  all  necessary  changes  in aircraft  attitude  with  the  least  amount  of control pressures to avoid excessive loads on the aircraft structure. Thunderstorms  and  areas  of  severe  turbulence should be avoided.  If such areas are to be penetrated, it will be necessary to counter rapid changes in attitude and accept major indicated altitude variations. Penetration   should   be   at   an   altitude   that   provides adequate  maneuvering  margins  as  a  loss  or  gain  of several  thousand  feet  of  altitude  may   be  expected. The    recommended    penetration    speed    in    severe turbulence  is  170  KIAS.    Pitch  attitude  and  constant power   settings   are   vital   to   proper   flight   technique. Establish recommended penetration speed and proper attitude prior to entering turbulent air to minimize most difficulties.          False     indications     by     the     pressure instruments   due   to   barometric   pressure   variations within   the   storm   make   the   instruments   unreliable. Maintaining  a  pre-established  attitude  will  result  in  a fairly constant airspeed.  Turn cockpit and cabin lights on to minimize the blinding effects of lightning and do not   use   autopilot   altitude   hold.      Maintain   constant power    settings    and    pitch    attitude    regardless    of airspeed    or    altitude    indications.        Concentrate    on maintaining    a    level    attitude    by    reference    to    the FD/attitude  indicator.    Maintain  original  heading  and don't make ant turns, unless absolutely necessary.