TM 1-1510-218-10 8-16 d.   VA FAIL annunciator light – Extinguished. e.   Radio altimeter DH SET control – Set to 200 feet. f.    Radio altimeter TEST switch – Press and hold.        "Minimum,    minimum"    will    be announced once followed by the illumination of the VA FAIL light. g.   Radio altimeter TEST switch – Release. 12.  Avionics – Check and set as required. 13.  Flaps – Check. 14.  Altimeters – Set and checked. * 8-29.  TAXIING. Taxi  speed  can  be  effectively  controlled  by  the use  of  power  application  and  the  use  of  the  variable pitch propellers in the BETA range.  Normal turns may be  made  with  the  steerable  nose  wheel;  however,  a turn  may  be  tightened  by  using  full  rudder  and  inside brake as necessary.  Turns should not be started with brakes    alone,    nor    should    the    aircraft    be    pivoted sharply on one main gear. If the aircraft must be taxied in conditions of mud, tall  grass,  or  other  conditions  of  high  surface  friction, taxi   at   a   slow   but   steady   speed   using   power   as necessary and minimum braking.  Hold the yoke full aft to  reduce  pressure  on  the  nose  wheel.    Attempt  to prevent unnecessary stops on a soft surface. 1.   Brakes – Check. CAUTION For  safety,  the  PF  should  primarily  focus his attention outside the aircraft.  The PNF should check the flight instruments. 2.   Flight    instruments    –    Check    for    normal operation. 8-30.  ENGINE RUNUP. CAUTION Monitor    oil    temperature    closely    during ground operation with propellers in FEATHER  due  to  lack  of  air  flow  over  oil cooler. 1.   Parking brake – As required. 2.   Propeller   feathering    –    Check    by    pulling propeller     levers     aft     through     detent     to FEATHER.  Check that propeller will feather and    advance    levers   to   the   HIGH   RPM position. H 3.   AUTOFEATHER/AUTO IGNITION – Check. a.   Condition levers – LOW IDLE. b.   ENG AUTO IGN Switches – On. c.   AUTOFEATHER switch – Hold to TEST. d.   POWER levers –  Advance until  IGN ON lights are extinguished and AUTOFEATHER   lights   are   illuminated, approximately 22% torque. e.   #1 POWER lever – Retard and check. (1)  At 16 – 21% torque – #2 AUTOFEATHER   light   out,   #1   IGN ON light illuminated. (2)  At 9 – 14% torque – Both AUTOFEATHER lights out (propeller starts to feather). f.    #1  POWER  lever  –  Approximately  22% torque. g.   Repeat steps a. through f. for #2 engine. h.   POWER levers – IDLE (both AUTOFEATHER lights out, neither propeller    feathers    and    both    IGN    ON lights illuminated). i.    AUTOFEATHER switch – ARMED. j.    ENG AUTO IGN 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 follows: a.   POWER – Set 1800 RPM.