TM 55-1510-220-10 (9) MIN   indicator.      Displays   time   to   TACAN station in minutes. e. Avionics TACAN Operation. (1) Turn on procedure: 1. Power switch (fig.  3-18) ON. 2. Volume control As required. 3. Course     indicator     switches     (fig.          230) TACAN. 4. RMI switches TACAN. 5. Self-test  procedure:  Course  knob  on  pilot's HSI Set. (a) Pilot's HSI lateral deviation bar Centered, with course knob set to 180 ±2  degrees,  and  TO-FROM  indicator indicating TO. (b) RMI bearing pointers (fig.  310) Point to 180 degrees. (c) HSI course knob Increase the selected course.  The lateral deviation bar on a 180 ±2 degrees TO indication and the bearing pointers on each course indicator  read  180      degrees.    Using the  course  knob,  increase  the  selected course,  the  lateral  deviation  bar  will move left. Decrease the selected course,  the  deviation  bar  will  center, then move to the right of center.  Full scale deflection will be 10 ± 1°. f. Normal Operating Procedure: 1. RMI single needle switch (fig.  3-10) VOR- TACAN. 2. RMI  selector  switch  (instrument  panel,  fig. 2-30) TACAN. 3. Course indicator selector switch (instrument panel, fig.  2-30) TACAN. 4. TACAN X-Y switch As required. 5. TACAN     channel     selector     knobs     Select desired channel. 6. Wait  5  seconds  for  signal  acquisition  and lock-on. 7. If  bearing  lock-on  is  not  obtained,  perform an inflight self-test to insure correct operation  of  the  system.    Anytime  a  course indicator   NAV   or   VOR   LOC   flag   is   in view,   bearing,   lateral   deviation,   and   TO- FROM  information  may  be  inaccurate  and should be disregarded. 8. Insure     that     audio     station     identification signal   is   correct   for   the   ground   station selected. 9. RMI  single-needle  pointer  Read  bearing  to station. 10. HSI course control knob Set desired course. 11. HSI   lateral   deviation   bar   Read   deviation from   selected   course.      Course   arrow   will show wind correction angle when the lateral deviation bar is centered and the aircraft is tracking the selected course. 12. TACAN indicator Read distance to station. 13. To determine course TO or course FROM a TACAN  station,  rotate  course  knob  (pilot's HSI)  until  lateral  deviation  bar  is  centered and   the   TO-FROM   pointer   reads   TO   or FROM. 14. To    use    TACAN    during    pilot-controlled flight,  control  aircraft  by  manual  controls, responding  to  information  displayed  on  the flight   director,   RMI,   HSI,   TACAN,   and other instruments. 15. To  use  TACAN  with  the  autopilot,  engage autopilot and monitor autopilot performance on  flight  director,  RMI,  HSI  and  TACAN indicators.        Verify    adherence    to    preset heading     and     course,     and     confirm     the execution of displayed steering commands. NOTE The   TACAN   ground   speed   reading will    be    accurate    only    when    the aircraft  is  on  a  course  directly  to  or from the TACAN station. (1) Shutdown  procedure:  TACAN  power  switch (fig.  3-18) OFF. Change 2 3-36