TM 1-1510-225-10 8-16 NOTE AUTOFEATHER annunciators will illuminate     and     extinguish     with     each fluctuation   of   torque   as   the   propeller feathers. (1)  Approximately   16   to   21%   torque, opposite AUTOFEATHER annunciator   extinguishes,   IGN   ON annunciator illuminated. (2)  Approximately 9 to 14% torque, both AUTOFEATHER annunciators extinguished (prop begins to feather). (3)  Return POWER levers to approximately 22% torque. e.   Repeat procedure with other engine. f.    POWER levers – IDLE. g.   AUTOFEATHER switch – ARM. h.   AUTO IGNITION switches – OFF. H 4.  Overspeed  governors  and  rudder  boost  – Check as required. a.   RUDDER BOOST switch – On. b.   PROP levers – HIGH RPM. c.   PROP GOV TEST switch – Hold in TEST position. d.   Left    POWER    lever    –    Increase    until propeller is stabilized at 1830 – 1910 RPM.    Continue  to  increase  until rudder   movement   is   noted.      (Observe ITT and torque limits.) e.   POWER lever – Retard to IDLE. f.    Repeat  steps  c,  d,  and  e  for  the  right engine. H 5.  Primary governors – Check as required. a.   POWER levers – Set 1800 RPM. b.   PROP   levers   –   Retard   to   FEATHER detent.  Note propellers stabilize between 1600 and 1640 RPM. c.   PROP    levers    –    HIGH   RPM.        Note propellers return to 1800 RPM. H 6.  ENGINE ANTI-ICE – Check. a.   ENGINE ANTI-ICE – ON. (1)  Both advisory lights illuminated. (2)  Both bypass doors extended. (3)  Maximum   time   for   (1)   and   (2)   is 15 seconds. b.   ENGINE ANTI-ICE – OFF. (1)  Both advisory lights extinguish. (2)  Both bypass doors retracted. (3)  Maximum   time   for   (1)   and   (2)   is 15 seconds. c.   Electrical standby system – Check. 7.  CONDITION levers – HIGH IDLE. 8.  POWER levers – IDLE. H 9.  Anti-ice/deice systems – Check. a.   PROP deice –  Check.    When  MANUAL mode    is    selected,    note    rise    on    DC loadmeter.        When    AUTO    mode    is selected,    monitor    prop    ammeter    for 90 seconds    and    ensure    the    indicator remains  in  the  normal  operating  range the entire time. NOTE If   windshield   heat   is   needed   prior   to takeoff,    use    NORMAL    setting    for    a minimum  of  15  minutes  prior  to  selecting HIGH  to  provide  adequate  preheating  and minimize the effects of thermal shock.  The windshield  heat  thermostat  will  invalidate the check in OAT above 20 to 30 C. b.   WSHLD   ANTI-ICE    –    Check.        Note increases   on   the   loadmeter   and   cycle through both normal and high settings. c.   All anti-ice/deice switches – OFF. d.   Surface deice system – Check. H 10.  Vacuum and pneumatic system – Check. a.   LEFT BLEED AIR VALVE – OFF. (1)  Pneumatic    and    suction    pressures remain normal. (2)  L BL AIR OFF annunciator illuminates. (3)  Both    BL   AIR   FAIL    annunciators remain extinguished. b.   RIGHT BLEED AIR VALVE – OFF. (1)  Pneumatic    and    suction    pressures read zero. (2)  Both BL AIR OFF and BL AIR FAIL annunciators illuminated.