TM 55-1510-222-10
Figure 3-16. ADF Control Unit (ADF-60)
NOTE
The TACAN portion of a VORTAC
station will be read on the HSI only
when the proper channel is selected
on the TACAN control panel and
TACAN is selected with the HSI
selector
switch.
TACAN
range
information is displayed on the HSIs
when NAV 1, NAV 2, or TACAN is
selected as the navigation source.
Distance
information
accuracy
is
dependent upon the selection of the
proper TACAN station.
The TACAN system may be operated on the flight
director system and connected to and used with the
autopilot system. When employed as the primary
means of navigation, aircraft flight may be controlled
manually or by the autopilot. Magnetic bearing to
TACAN stations may be shown on the RMIs when the
VOR/TACAN switch to the lower left of the pilots' RMI
and to the far right of the copilot's instrument panel are
set to the TACAN position. Also the VOR/TACAN
switch for the #1 (yellow) needle on the RMIs must be
selected to the VOR/TACAN position. Course deviation
only may be shown on the HSIs when the TACAN
selector for the HSI is depressed. TACAN slant range
is displayed on each HSI range in the digital distance
display. TACAN distance, groundspeed, and time to
station are all displayed in the TACAN indicator located
on the copilot's instrument panel.
The TACAN control panel enables selection of the
TACAN frequency (channel) to be used, and provides
self-test of TACAN circuits. X, Y or XA/A channel is
selected by the X-Y-XA/A switch. Y channels differ
from X channels in frequency assignment and pulse
spacing. Y channels were developed to relieve
frequency congestion. Use of the Y channels has been
implemented
along
with
0.05
MHz
spacing
for
VOR/VORTAC stations and Y channels are paired with
these new frequencies (for example, VOR frequency
113.1 is TACAN channel 78X; VOR 113.15 is TACAN
channel 78Y). DOD FLIP charts will include the Y
designation in the Data Block for Radio Aids to
Navigation. The XA/A position enables air to air
ranging with other similarly equipped aircraft. Tuning
channels for the two aircraft must be 63 channels apart.
The small (outer) control provides system power
ON/OFF and station identity tone volume control.
TACAN circuits are protected by a TACAN circuit
breaker in AVIONICS portion of the copilot's right
sidewall panel.
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