to INS circuits. It is dedicated only to updating the INS,
is activated when the INS is operational, and is
controlled only by the INS. The INS TACAN consists of
a range unit and a distance indicator, both located on
the INS equipment rack and both identical to their
counterparts in the avionics TACAN, and an antenna
located on the underside of the fuselage. No controls
are required or provided for the INS TACAN system.
The system is protected by a circuit breaker on the INS
Controls and Indicators.
Activates system self-test.
Displays TACAN channel select-
Selects X or Y mode for TA-
Adjusts TACAN volume.
Dual knob for manual selection
of operating channel.
Selects tens and hundreds part
of channel number.
Selects units part of channel
Activates or deactivates system.
Displays slant range distance in
nautical miles from aircraft to
selected TACAN ground station.
Displays ground speed in knots.
Displays time to TACAN station
Avionics TACAN Operation.
1. ON-OFF switch (TACAN panel) ON.
2. VOL knob As required.
(instrument panel) -Select TACAN.
The pilot and copilot should not
select TACAN simultaneously for
Figure 3-17. TACAN Control Panel and Range Indicator (ID-2218)