TM 1-1510-218-10 8-17 NOTE Reduce PROP levers gently to the detent to prevent  the  PROP  RPM  dropping  abruptly below 1600 RPM. b.   PROP levers aft gently to detent – Set. c.   Propeller RPM 1600 to 1640 – Check. d.   PROP levers – HIGH RPM. H 6.   Ice vanes – Check as follows: a.   ICE  VANE  switches  –  EXTEND.    Verify torque  drop,  TGT  increase,  illumination of  VANE  EXT  light  and  visually  confirm the  bypass  doors  are  open.    Maximum allowable time for the complete operation is 15 seconds – Check. b.   ICE VANE switches – RETRACT.  Verify return to original torque and TGT, VANE EXT    light    extinguished,    and    visually confirm   the   bypass   doors   are   closed. Maximum allowable time for the complete    operation    is    15    seconds    – Check 7.   CONDITION levers – HIGH IDLE. 8.   POWER levers – IDLE. H 9.   Anti-ice   and   deice   systems   –   Check   as follows: a.   WSHLD ANTI-ICE switches – NORMAL. Check PILOT and COPILOT (individually)    for    loadmeter    rise,    then OFF. b.   PROP  deice  –  Check.   When  MANUAL mode    is    selected,    note    rise    on    DC loadmeter.         When     AUTO     mode     is selected,    monitor    prop    ammeter    for 2 minutes     and     ensure     the     indicator remains  in  the  normal  operating  range the entire time. c.   DEICE switch – SINGLE CYCLE AUTO. Check  for  a  drop  in  pneumatic  pressure and  wing  deice  boots  inflation  and  after 6 seconds for a second drop in pneumatic pressure. H 10.  Pneumatic System – Check as follows: a.   LEFT BLEED AIR VALVE switch – OFF. b.   Pneumatic    pressure    12    to    20    psi    – Check. c.   L BL AIR OFF light on – Check. d.   RIGHT   BLEED   AIR   VALVE   switch   – OFF. e.   L & R BL AIR OFF, L & R BL AIR FAIL lights  and  MASTER  WARNING   light  – ON. f.    LEFT   BLEED    AIR   VALVE    switch    – OPEN. g.   L BL AIR OFF and L & R BL  AIR FAIL lights  –  OFF  and  pneumatic  pressure  at 12 to 20 psi – Check. h.   RIGHT   BLEED   AIR   VALVE   switch   – OPEN. i.    R BL AIR OFF light off – Check. H      * 11.  Pressurization system – Check and set as follows: a.   CABIN DOOR caution light extinguished – Check. b.   Vent windows closed – Check. c.   BLEED AIR VALVE switches – OPEN. d.   Cabin  altitude  500  feet  lower  than  field pressure altitude – Set. e.   CABIN PRESS switch – TEST (hold). f.    CABIN CLIMB gauge descending indication  –  Check,  then  release  TEST switch. g.   ACFT   ALT   –   Set   to   pressure   altitude plus 200 feet. h.   RATE   control   –   Set   between    9   and 12 o'clock. 12.  CONDITION levers – As required. NOTE If   windshield   anti-ice   is   needed   prior   to takeoff,  use  normal  setting  for  a  minimum of    15    minutes    prior    to    selecting    high temperature to provide adequate preheating  and  minimization  of  effects  of thermal shock. * 8-31.  BEFORE TAKEOFF. 1.   AUTOFEATHER switch – ARM. 2.   BLEED AIR VALVES – As required. 3.   FUEL   panel   –   Check   fuel   quantity   and switches positions. 4.   Flight  and  engine  instruments  –  Check  for normal indications. 5.   CABIN CONTROLLER – Set.