TM 1-1510-225-10 8A-15 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. b.  WSHLD    ANTI-ICE    –    Check.        Note increases   on   the   loadmeter   and   cycle through both normal and high settings. 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. 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. c.   LEFT BLEED AIR VALVE – ON. (1)  Pneumatic and suction pressures return to normal. (2)  Both BL     AIR     FAIL     annunciators extinguished. (3)  L BL AIR OFF annunciator extinguished. d.  RIGHT BLEED AIR VALVE – ON. (1)  R BL AIR OFF annunciator extinguished. H 11.  Automatic flight control system – Check. a.  Autopilot   controller   TRIM  UP,   TRIM   DN Annunciators  –  Check  not  illuminated.    A steady  illumination  of  TRIM  UP  or  TRIM DN  annunciator   indicates   that   automatic synchronization    is    not    functioning    and autopilot should not be engaged. b.  Turn knob – In center detent position. c.   Elevator trim control switch – ON. d.  Control wheel – To mid travel. e.  Autopilot controller  AP button  –  Press.  AP ENGAGE  and  YD  ENGAGE  annunciators on   autopilot   controller   will   flash.      Servo clutches  will  engage.    FD  flag  on  ADI  in view. f.    Control  movement  –  Check  when  pushed ON. If   autopilot   or   yaw   damper   disengages during  overpower  test,  do  not  use.    If  AP ENGAGE    or    YD    ENGAGE    annunciator continues to flash, do not use. g.  Rudder  pedals  –  Overpower  slowly.    YD ENGAGE  annunciator  stops  flashing.    FD flag retracts. h.  Elevator trim follow-up – Check. i.    Control wheel – Hold aft of mid travel.  Trim wheel     should     run     nose     down     after approximately   3   seconds.      Trim   down annunciator should illuminate after approximately 8 seconds. j.    Control wheel – Hold forward of mid travel. Trim   wheel   should   run   nose   up   after approximately    3    seconds.        TRIM   UP annunciator should illuminate after approximately  8  seconds,  and  AP  TRIM FAIL annunciator and MASTER WARNING flasher should illuminate after approximately 15 seconds. k.   AP/YD   &   TRIM   DISC   button   –   Press through  second  level.      Autopilot  and  yaw damper   should   disengage   and   ELECT TRIM  OFF  annunciator  should  illuminate. AP ENGAGE and YD ENGAGE annunciators  on  instrument  panel  should flash five times and autopilot off aural alert should sound for 1 second. l.    MASTER  WARNING   flasher   –   Press   to reset. WARNING