TM 1-1510-224-10 NOTE If the SYM GEN reversionary switch is moved to  the  REV  position  with  the  autopilot/flight director    selected    to    that    side,    the    flight director modes will disengage. Table 3-6 shows which flight director modes are reset by the EFIS when sources are changed. NOTE When ATT is selected, the autopilot will disengage. o. Automatic  flight  control  system  -  Check  as follows: 1. Altitude alerter - Check as follows: NOTE Pause  for  a  few  seconds  between  each  step to allow time for proper indications. a. Altitude   preselector   -   Set   to   more than 1000 feet above altitude set on pilot's    altimeter.        Pilot's    altimeter altitude alert annunciator light should be extinguished. b. Pilot's  altimeter  barometric  set  knob -    Slowly    increase    pilot's    altimeter setting. c. Altitude alerter annunciator and horn - Verify that altitude alerter annunciator on pilot's altimeter illuminates  and  altitude  alerter  horn sounds when pilot's altimeter reading  is  approximately  1000  feet from    value    set    on    altitude    select controller. d. Pilot's    altimeter    -    Reset    to    field elevation. e. Altitude  preselector  -  Reset  to  field elevation. f. Pilot's  altimeter  barometric  set  knob -    Slowly    increase    pilot's    altimeter setting. g. Altitude alerter annunciator and horn -    Verify    that    the    altitude    alerter annunciator on pilot's altimeter illuminates  and  altitude  alerter  horn sounds   when   altimeter   reading   is approximately   250   feet   from   value set on altitude alert controller. h. Pilot's    altimeter    -    Reset    to    field elevation. 2. Flight director - Check as follows: a. SBY pushbutton switch-indicator (flight director mode selector     - Depress  for  at  least  5  to  8  seconds and verify the following indications: (1)   Flight   director   mode   selector   - Annunciators illuminate. (2)   Autopilot controller - Annunciators illuminate. (3)   Altitude select controller - All 8's illuminate. (4)   Pilot's   altimeter   altitude   alerter annunciator - Illuminates. (5)   EADI -  FD FAIL  (amber)  will  be annunciated. b. After SBY pushbutton switch- indicator   has   been   held   depressed for 5 to 8 seconds verify that: ( 1)  AP TRIM annunciator - Illuminates. ( 2)  Autopilot disconnect horn - Sounds. c. SBY   pushbutton   switch-indicator   - Release. d. FD and   ATT   annunciations   on   the EADI - Check extinguished. 3. Autopilot - Check as follows: a. Autopilot  trim  annunciators  -  Check extinguished. b. TURN knob - Center. c. ELEV TRIM switch - Check on. Table 3-6.  Flight Director Modes Reset when EFIS Sources Change Selection Action FD Modes Reset V/L or INS/TCN HDG ATT Navigation Lateral All modes BT03843 3-49