TM 1-1510-225-10 8-24 8-53.  FLIGHT CONTROLS. The   aircraft   is   stable   under   all   normal   flight conditions.      Aileron,   elevator,   rudder,   and   trim   tab controls function effectively throughout all normal flight conditions.  Elevator control forces are relatively light in the   extreme   aft   Center   of   Gravity   (CG)   condition, progressing to moderately high with CG at the forward limit.  Extending and retracting the landing gear causes only   slight   changes   in   control   pressure.      Control pressures  resulting  from  changing  power  settings  or repositioning the flaps are not excessive in the landing configuration at the most forward CG.   The  minimum speed  at  which  the  aircraft  can  be  fully  trimmed  is 92 KIAS   (gear   and   flaps   down,   propellers   at   high RPM).  Control forces produced by changes in speed, power  setting,  flap  position  and  landing  gear  position are light  and  can  be  overcome  with  one  hand  on  the control  wheel.    Trim  tabs  permit  the  pilot  to  reduce control forces to zero.  During single-engine operation, the rudder boost system aids in relieving the relatively high    rudder    pressures    resulting    from    the    large asymmetry in power. 8-54.  LEVEL FLIGHT CHARACTERISTICS. All flight characteristics are conventional throughout the level flight speed range. Section V.  ADVERSE ENVIRONMENTAL CONDITIONS 8-55.  INTRODUCTION. The purpose of this section is to inform the pilot of   the   special   precautions   and   procedures   to   be followed  during  the  various  weather  conditions  that may be encountered in flight.  This section is primarily narrative;   only   those   checklists   that   cover   specific procedures  characteristic  of  weather  operations  are included.      The   checklist   in   Section   II   provides   for adverse environmental operations. 8-56.  COLD WEATHER OPERATIONS. Operational    difficulties    may    be    encountered during extremely cold weather, unless proper steps are taken prior to or immediately after flight.  All personnel should understand and be fully aware of the necessary procedures and precautions involved. CAUTION For   ground   operations   conducive   to   ice accumulation   on   landing   gear   structure, use  undiluted  defrosting  fluid  on  brakes and  tires  to  reduce   the   tendency   of   ice accumulation    during    taxi,    takeoff    and subsequent landing. a.    Preparation  for  Flight.    Accumulations  of snow,  ice,  or  frost  on  aircraft  surfaces  will  adversely affect  takeoff  distance,  climb  performance,  and  stall speed  to  a  dangerous  degree.    Such  accumulations must  be  removed  before  flight.    In  addition  to  the normal  exterior  checks,  following  the  removal  of  ice, snow, or frost, inspect wing and empennage surfaces to verify that these surfaces remain sufficiently cleared. Also, move all control surfaces to confirm full freedom of movement.  Assure that tires are not frozen to wheel chocks or to the ground.  Use ground heaters, anti-ice solution, or brake deice to free frozen tires.  When heat is applied to release tires, the temperature should not exceed  71 °C  (160  °F).    Refer  to  Chapter  2  for  anti- icing, deicing, and defrosting treatment. b.    Engine Starting.  When starting engines on ramps covered  with  ice,  propeller  levers  should  be  in the FEATHER position to prevent the tires from sliding. To  prevent  exceeding  torque  limits  when  advancing condition   levers   to   HIGH   IDLE   during   the   starting procedure,  place  the  power  lever  in  BETA  and  the propeller  lever  in  HIGH  RPM  before  advancing  the condition lever to HIGH IDLE. c.    Before Taxi and Engine Runup. Procedures are the same as those outlined in Section II.  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    PC    must    use    his judgement  to  determine  which  runup  procedures  will be accomplished. d.    Taxiing.  Whenever possible, taxiing in deep snow,   lightweight   dry   snow,   or   slush   should   be avoided, particularly in colder OAT conditions.   If  it  is necessary to taxi through snow or slush, do not set the parking brake when stopped.  If possible, do not park the aircraft in snow or slush deep enough to reach the brake  assemblies.    Chocks  or  sandbags  should  be used to prevent the aircraft  from  rolling  while  parked. Before  attempting  to  taxi,  activate  the  brake  deice system, insuring that the bleed air valves are open and that the condition levers are in HIGH IDLE.  An outside observer   should   visually   check   wheel   rotation   to ensure   brake   assemblies   have   been   deiced.      The condition  levers  may  be  returned  to  LOW  IDLE  as soon as the brakes are free of ice.