TM 55-1510-215-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
h.
COURSE select knob (HSI) - Rotate until
course arrow again indicates bearing on
RMI, c. above, and TO/FROM indicator
reads TO.
i.
Fly a 90° right turn such that the flight
path is at a 90° angle to the direction to
the station. The vertical needle on the
course indicator-selector should deflect
noticeably to the left after one or two
miles of flight (assuming the station is 25
to 50 miles from the aircraft).
j.
TACAN range test: Achieve adequate
usable at 45 miles at 1,250 feet above
station antenna altitude.
k.
TACAN ground-track accuracy test: fly
aircraft over a predetermined ground
check point. The maximum error shall be
± 3°.
1.
Check TACAN distance indicator for
accuracy
by
comparing
indicated
distances with known distances, speed,
and elapsed time.
m.
Check air-to-air mode when a similarly
equipped aircraft is available at a known
range.
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