station identifier, and groundspeed may be displayed on
the TACAN digital display. The TACAN/DME also
provides distance information to the inertial navigation
system (INS). The system is protected by a 2-ampere
circuit breaker placarded
TACAN, located on the
overhead circuit breaker panel (fig. 2-9).
TACAN Control Unit Controls and Functions (fig.
X-Y mode selector switch. Selects either X
or Y mode.
Volume control (inner concentric knob).
Turns system on. Volume control is inoperative in this
Channel selector (outer concentric knob).
Rotation allows selection of desired TACAN channel.
switch. Allows selection of air-to-air or air-to-ground
mode of operation.
TACAN/DME Display Unit Controls and Functions
Display. Displays distance to station,
bearing to station, groundspeed, time to station, and
station identifier, depending on the page being viewed.
PAGE pushbutton selector switch. When
the mode selector switch is in the NAV 1 or NAV 2
position, depressing the PAGE pushbutton selector
switch will alternate the lower right portion of the display
between distance to station and groundspeed. When the
mode selector switch is set to BOTH, the PAGE
pushbutton selector switch will alternate the left and right
lower displays between bearing to station and station
Mode selector switch.
OFF. Turns system off/on.
NAV 1. Selects information for
display from the TACAN/DME unit as selected by the # 1
depending upon whether either pilot has selected TACAN
on EFIS display controller.
NAV 2. Selects information for
display from the TACAN/DME unit as selected by the # 2
VHF navigation receiver.
1. Channel Display
2. X-Y Mode Selector Switch
3. Volume Control (Inner Concentric Knob)
4. Channel Selector (Outer Concentric Knob)
5. Air-to-Air/Air-to-Ground Mode Selector Switch
Figure 3-26. TACAN/DME Control Unit