TM 1-1510-223-10 Change 3          8-5 b.   EHSI. (1)   DTRK,   NM,   GSPD,   and   HDG   re- places with dashes. (2)   HDG FAIL annunciator appears. (3)   Course  indicator  and  glideslope  off flags appear. c.   AP disconnect horn sounds after 5-7 sec- onds. NOTE Preflight test of the composite mode will cause the same results as the above tests, except digi- tal heading readouts will be replaced with a red FAIL  indication,  and  expanded  localizer  scale and pointer will be removed. A localizer frequency must be tuned on both NAV receivers to enunciate ILS comparitor monitor. EFIS test is inhibited during glideslope capture. 23.   Automatic flight control system — Check as follows: a.   Altitude alerter — Check as follows: NOTE Pause a few seconds between each step to al- low time for proper indications. (1)   Altitude  preselector  —  Set  to  more than 1000 feet above altitude set on the  pilots’  altimeter.  Pilot’s  altimeter altitude  alert  annunciator  should  be extinguished. (2)   Pilot’s  altimeter  barometric  knob  — Slowly increase pilot’s altimeter set- ting. (3)   Altitude alerter annunciator and horn — Verify that altitude alerter annun- ciator  on  pilot’s  altimeter  illuminates and altitude alerter horn sounds when pilot’s  altimeter  reading  is  approxi- mately  1000  feet  from  value  set  on altitude select controller. (4)   Pilot’s   altimeter   —   Reset   to   field elevation. (5)   Altitude preselector — Reset to field elevation. (6)   Pilot’s altimeter barometric set knob —  Slowly  increase  pilot’s  altimeter setting. (7)   Altitude alerter annunciator and horn — Verify that altitude alerter annun- ciator  on  pilot’s  altimeter  illuminates and altitude horn sounds when altim- eter reading is approximately 250 feet from value set on altitude alert con- troller. (8)   Pilot’s   altimeter   —   Reset   to   field elevation. b.   Flight director — Check as follows: (1)   SBY  push-button  switch  -  indicator (flight  director  mode  selector)  -  De- press for at least 5 to 8 seconds and verify the following indications: (a) Flight director mode selector — Annunciators illuminate. (b) Autopilot controller — Annuncia- tors 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 push-button switch-indica- tor has been held depressed for 5 to 8 seconds verify that: (a) AP TRIM annunciator — Illumi- nates. (b) Autopilot    disconnect    horn    — Sounds. (3)   SBY push-button switch-indicator — Release. (4)   FD   and   ATT   annunciators   on   the EADI — Check extinguished. c.   Autopilot — Check as follows: (1)   Autopilot trim annunciators — Check extinguished.