COURSE select knob (HSI) - Rotate until
course arrow again indicates bearing on
RMI, c. above, and TO/FROM indicator
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).
TACAN range test: Achieve adequate
usable at 45 miles at 1,250 feet above
station antenna altitude.
TACAN ground-track accuracy test: fly
aircraft over a predetermined ground
check point. The maximum error shall be
Check TACAN distance indicator for
distances with known distances, speed,
and elapsed time.
Check air-to-air mode when a similarly
equipped aircraft is available at a known