TM 1-1510-224-10 director mode selector Depress for at least  5  to  8  seconds  and  verify  the following indications: (a) Flight director mode selector Annunciators illuminate. (b) Autopilot   controller   Annunciators illuminate. (c) Altitude   select   controller   All   8's illuminate. (d) Pilot's    altimeter    altitude    alerter annunciator Illuminates. (e) EADI   FD   FAIL   (amber)   will   be annunciated. (2) After SBY pushbutton switch- indicator   has   been   held   depressed for 5 to 8 seconds verify that: (a) AP TRIM annunciator Illuminates. (b) Autopilot disconnect horn Sounds. (3) SBY pushbutton switch-indicator Release. (4) FD   and   ATT   annunciations   on   the EADI Check extinguished. c. Autopilot Check as follows: (1) Autopilot    trim    annunciators    Check extinguished. (2) TURN knob Center. (3) ELEV TRIM switch Check on. NOTE The   control   wheel   must   be   held   at mid-travel     due     to     ballast     in     the elevator. The autopilot will disconnect  during  pitch  wheel  check due  to  the  heavy  nose  down  force  if the    control    wheel    is    not    off    the forward stop. (4) Control wheel Move to mid-travel. (5) AP ENGAGE switch-indicator (autopilot controller) Depress to engage   autopilot   and   yaw   damper. Check   that   AP    ENGAGE    and    YD ENGAGE switch-indicators on autopilot controller and remote annunciators on instrument panel are illuminated. d. Autopilot overpower check Check as follows: (1) Rudder pedals Overpower slowly. (2) Control   wheel   Overpower   slowly   in   both directions. WARNING If     the     autopilot     or     yaw     damper disengages    during    the    overpower test,  the  system  is  considered  non- operative   and   should   not   be   used. The elevator trim system must not be forced   beyond   the   limits   which   are indicated on the elevator trim indicator. e. Elevator trim follow-up Check as follows: (1) Control  wheel  Move  aft  of  mid-travel. Trim   wheel   should   run   nose   down after approximately .3 seconds. TRIM DN annunciator (autopilot controller) should illuminate after approximately   6   to   8   seconds,   and AP     TRIM     annunciator     (instrument panel) should illuminate after approximately 15 seconds. (2) Control wheel Move forward of midtravel.      Trim   wheel   should   run nose up after approximately 3 seconds.         TRIM    UP     annunciator (autopilot controller) check illuminated  after  approximately  6  to  8 seconds.        AP    TRIM    annunciators (instrument  panel)  check  illuminated after approximately 15 seconds. f. AP & YD/TRIM DISC switch (control wheel) Depress  to  first  level.    Check  that  autopilot and  yaw  damper  disengage,  AP  ENGAGE and  YD  ENGAGE  switch-indicators  on  the autopilot controller and remote annunciators    above    the    EADI's    flash    5 times. g. Control wheel Hold to mid-travel. h. AP ENGAGE switch Re-engage. i. Turn  knob  Check  that  elevator  control  trim wheel   follows   in   each   applied   direction, then center. j. Pitch   wheel   Check   that   trim   responds   to pitch   wheel   movements.     (TRIM   UP   and TRIM DN annunciators may illuminate.) k. Heading  marker  Center  and  engage   HDG. Check  that  control  wheel  follows  a  turn  in each direction. l. GO   AROUND    button    (left    power    lever) Depress.    Check  that  AP  disengages  and FD 8-5