7. ON-OFF SWITCH. Activates or
(2.) TACAN distance indicator.
NM INDICATOR. Displays slant
range distance in nautical miles
from aircraft to selected TACAN
ground speed in knots.
3. MIN INDICATOR. Displays
time to TACAN station in min-
(Non-INS dedicated) TACAN Operation.
(I.) Turn-On procedure:
Power switch (TACAN control
panel, fig. 3-20) - ON.
Volume control - As required.
3. Course indicator switches (instru-
ment panel, fig. 2-29) -TACAN.
4. Self-test procedure: Course knob
on pilots HSI - Set to 180°, press
and hold TEST switch.
Pilots HSI course deviation bar -
Centered, with course knob set to
180 ±2 degrees, and TO-FROM
indicator indicating TO.
6. RMI bearing pointers (fig. 3-9)
and pilots HSI bearing pointer -
Point to 180 degrees.
HSI course knob - Increase the
selected course. The course devia-
tion bar on a 180 ± 2 degrees TO
indication and the bearing point-
ers on each RMI indicator read
180 degrees. Using the course
knob, increase the selected course,
the course deviation bar will
move left. Decrease the selected
course, the course bar will center,
then move to the right of center.
Full scale deflection will be 10
f. Normal Operating Procedure:
RMI single needle switch (fig. 3-9) -
RMI selector switch (instrument panel,
fig. 2-29) -TACAN.
Course indicator selector switch (in-
strument panel, fig. 2-29) - TACAN.
TACAN X-Y switch - As required.
TACAN channel selector knobs - Select
Wait 5 seconds for signal acquisition
If bearing lock-on is not obtained, per-
form an inflight self-test to insure cor-
rect operation of the system. Anytime
a course indicator NAV or VOR LOC
flag is in view, bearing, course devia-
tion, and TO-FROM information may
be inaccurate and should be disre-
Insure that audio station identification
signal is correct for the ground station
RMI single-needle pointer and pilot
HSI bearing pointer -Read bearing to
HSI course control knob - Set desired
HSI course deviation bar - Read devia-
tion from selected course. Course
arrow will show wind correction angle
when the course deviation bar is cen-
tered and the aircraft is tracking the
TACAN indicator and pilots HSI -
Read distance to station.
To determine course TO or course
FROM a TACAN station, rotate course
knob (pilots HSI) until course devia-
tion bar is centered and the TO-FROM
pointer reads TO or FROM.
To use TACAN during pilot-controlled
flight, control aircraft by manual con-
trols, responding to information dis-
played on the flight director, RMI,
HSI, TACAN, and other instruments.
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.