TM 1-1510-218-10 8A-20 CAUTION Monitor    ITT/TGT    during    shutdown.        If sustained combustion is observed, proceed immediately to Abort Start procedure, Paragraph 8A-24. 11.  CONDITION levers – FUEL CUTOFF. 12.  PROP levers – FEATHER. Do     not     turn     off     exterior     lights     until propeller rotation has stopped. 13.  AVIONICS MASTER POWER – OFF. 14.  MASTER PANEL LIGHTS – Off. 15.  EXTERIOR LIGHTS – OFF. 16.  MASTER SWITCH – Off. 17.  Key lock switch – OFF. 18.  Oxygen system – OFF. 19.  Chocks – As required. 20.  Parking brake – As required. 21.  Control locks – As required. 8A-46.  BEFORE LEAVING AIRCRAFT. 1.   Wheel chocks – As required. NOTE Brakes should be released after chocks are in place, ramp conditions permitting. 2.   Parking brake – As required. 3.   Flight controls – As required. 4.   OVERHEAD FLOOD LIGHT – OFF. 5.   STANDBY PUMPS – Off. 6.   MAP lights – OFF. 7.   Windows – As required. 8.   Emergency exit lock – As required. 9.   Galley power switches – OFF. 10.  Aft cabin light – OFF. 11.  Door light – OFF. CAUTION If  strong  winds  are  anticipated  while  the aircraft  is  unattended,  the  propellers  shall be   secured   to   prevent   windmilling   with zero engine oil pressure. 12.  Walk-around inspection – Complete. 13.  Aircraft forms – Complete. 14.  Aircraft secured – Check. Section III.  INSTRUMENT FLIGHT 8A-47.  GENERAL. This     aircraft     is     qualified     for     operation     in instrument   flight   meteorological   conditions.       Flight handling,  stability  characteristics,  and  range  are  the same   during   instrument   flight   conditions   as   when under visual flight conditions. 8A-48.  INSTRUMENT FLIGHT PROCEDURES. Refer to FM 1-240, FM 1-230, FLIP, AR 95-1, FC 1-218, FAR 91 (subparts A and B),  applicable foreign government  regulations,  and  procedures  described  in this  manual.    Accomplish  all  instrument  flight  tasks  in accordance with the appropriate ATM. Section IV.  FLIGHT CHARACTERISTIC 8A-49.  STALLS. A   pre-stall   warning   in   the   form   of   very   light buffeting  can  be  felt  when  a  stall  is  approached.    A mechanical   warning   is   also   provided   by   a   warning horn.  The warning horn starts to alarm approximately 5 to 10 knots above stall speed with the aircraft in any configuration.    If   correct   stall   recovery   technique   is used, little altitude will be lost during the stall recovery. For  the  purpose  of  this  section,  the  term  “power  on” means that both engines and propellers are operating normally and are responsive to pilot control.  The term “power  off” means  that  both  engines  are  operating  at idle  power.    Landing  gear  position  has  no  effect  on stall speed. a.    Power-On    Stalls.        The    power    on    stall attitude is steep and,  unless this  high pitch attitude is maintained, the aircraft will generally “settle” or “mush” instead   of   stall.      It   is   difficult   to   stall   the   aircraft inadvertently  in  any  normal  maneuver.    A  light  buffet precedes    most    stalls,    and    the    first    indication    of approaching  stall  is  generally  a  decrease  in  control effectiveness,  accompanied  by  a  stall  warning  horn. WARNING