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to its original bearing and distance readings after 15
seconds. The TEST light will momentarily flash when
the test is initiated. If the light goes on and stays on
during test, a malfunction is indicated. In addition, the
OBC CNT format on the h4FD displays a tacan NO-GO
or NOT READY indication if there is a test failure. If a
self-test iu the TIR mode results in a failure indication,
select REC and perform the test again. If the failure
20-7 ORIGINAL
NAVAIR Oi-Fl4AAD-1
ORIGINAL
Figure 204. Tacan Controls and Indicators (Sheet 1 of 3)
20-E
NAVAIR Q1-Fl4AAD-I
NOMENCLATURE FUNCTION
0
BDHI tacan needle Displays relative bearing to the selected tacan station
0
BDHI UHF/ADF needle Displays relative bearing to a tuned UHF transmitter.
@ i,“d;;m r=w3 Displays slant range to a selected tacan station.
Alternate action lighted pushbutton that lights PLT or NFO to indicate which
cockpit has command of the tacan. Pressing the button cycles command
to the other cockpit and changes light indication.
0
Tacan VOL control Varies level of the tacan audio signal to the headsets. Clockwise rotation
increases volume.
@
Tacan mode switch OFF - Power not applied to tacan
REC - Receive:
Tacan determines bearing from aircraft to selected tacan
station. Bearing displayed on BDHI; available for MFD, HUD.
Station identifier is received, no range is calculated.
T/R - Transmit-receive:
In addition to the REC functions, tacan determines slant range
to selected tacan station. Distance displayed on BDHI;
available for MFD, HUD.
A/A REC - Air-to-air receive:
Tacan receives bearing information from a suitably equipped
cooperating aircraft and calculates the relative bearing to the
cooperating aircraft. No distance information is available.
A/A T/R - Air-to-air transmit-receive mode:
Tacan receives both distance and bearing information from a
suitably equipped cooperating aircraft and calculates the slant
range distance and relative bearing of the aircraft. If the aircraft
is not equipped with bearing transmitting capabilities, only
slant range is available.
Note
l Air-to-air tacan operation requires a 63 channel
separation between cooperating aircraft. Channel
use should be prearranged. Air-to-air tacan
between F-l+ is limited to slant range, no bearing
is provided.
l When the ANAJRC-107 (JTIDS) is installed, tacan
data on the HUD and MFD requires the selection of
DATA SIL, NORM, or POLL on the JTIDS control
panel.
0
Right hand channel The inner knob sets the channel number units digit. The outer knob sets X
knob and Y channels.
Figure 204. Tacan Controls and Indicators (Sheet 2 of 3)
20-9 ORIGINAL
NAVAIR 0%F14AAD-1
NOMENCLATURE FUNCTION
c9 TEST button/light The TEST button is used to initiate self-test. The light illuminates to
indicate failure of continuous monitor test or either manually or
automatically initiated self-test.
@
Left hand channel knob Sets channel number hundreds and tens digits.
0fg CHANNEL window Displays selected channel number and X or Y
Figure 20-4. Tacan Controls and Indicators (Sheet 3 of 3)
indication is removed, bearing information is still valid.
The ANKIRC-107 performs all the same tacan tests as
the AN/ARN-1 18. It also performs a commanded selftest
when a JTIDS OBC is selected on the MFD OBC
page. JTIDS OBC provides tacan fail data on the JTIDS
fail data page. Refer to JTIDS self-test Chapter 27. The
following will cause the tacan lock to break for 4 seconds:
the power up or down of JTIDS, going from OFF
or STBY to DATA SIL, NORM, or POLL or back to
STBY or OFF on the JTIDS control panel. The range
off flag will appear and bearing will swing to 270” for 2
seconds then reacquire lock to the station.
Whenever a signal becomes unreliable (loss exceeds
memory time), self-test is initiated automatically. If the
TEST light goes on at any time during flight, it indicates
a failure of automatic self-test and all tacan information
should be disregarded.
20.1.10 AN/ASW-27C Data Link. During carrier
alignment, D/L provides SINS data to the INS via the
CIU. This data is also provided to the SAHRS during
concurrent carrier alignment, Before takeoff the D/L
can be used to provide waypoint coordinates to the
MCS via the CIU for later use in steering and position
updating. After takeoff, the D/L provides control and
steering commands that are available for display or
may be coupled to the autopilot during vector steering
or ACL operation.
Refer to NAVAIR Ol-Fl4AAD-1A for a complete
　
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