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The proper channel is tuned by rotating channel selector knobs (1) to any of 126 channels. Knob (2), the
internal test mode, validates working condition of TACAN. The channel mode selector (4) allows X or
Y band to be selected. These controls are presented in the channel indicator (3). A volume control (5)
adjusts the audio level of the station identifier signal. The TACAN test button permits the user to
perform a system self-test. The function selector (6) has four settings:
Figure 5.11. TACAN Control Panel.
5.14.7.1. OFF—Removes power to the set.
5.14.7.2. REC—Energizes the receiver to obtain bearing information.
5.14.7.3. T/R—Energizes both receiver and transmitter to obtain both bearing and distance information.
5.14.7.4. A/A—Transmits and receives interrogations and replies to measure range to another A/A
TACAN-equipped aircraft. Bearing information is not provided on this set.
162 AFPAM11-216 1 MARCH 2001
5.14.8. VORTAC. In order to provide both military and civilian pilots the capability of positioning from
the same radio NAVAIDs, a combination of VOR and TACAN station was developed. Each facility
offers three services. VOR azimuth signals are transmitted on the published VOR frequency. TACAN
azimuth and DME signals are broadcast on the published UHF channel.
5.15. Fix-to-Fix Navigation (Using RMI and BDHI). Flying from one radial and DME to another is
basic to many departures and approaches. A heading to the desired point may be derived quickly
through the use of an RMI, providing a radial and a separate readout of DME. The same procedures
apply for a BDHI. The following technique and example are provided in order to demonstrate how to
compute a heading. Refer to Figure 5.12.
EXAMPLE: Present Position 180o/60
Desired Position 090o/30
Present Heading 000o
Figure 5.12. Fix-to-Fix Solution.
5.15.1. Tune, identify, and monitor correct VOR and TACAN.
5.15.2. Turn the aircraft in the general direction of the desired fix by turning to a heading approximately
halfway between the head of the bearing pointer (000o) and the radial on which the desired fix is located
(090o). In this case, turn to 045o.
AFPAM11-216 1 MARCH 2001 163
5.15.3. Visualize your aircraft position and the desired fix on the RMI as follows:
5.15.3.1. The center of the RMI is considered to be the VOR or TACAN, and the compass rose
simulates the radials around the station.
5.15.3.2. The fix with the greater range (180o/60) is established at the outer edge of the compass card.
5.15.3.3. The fix with the lesser range (090o/30) is established at a point which is proportional to the
distance represented by the outer edge of the compass card.
5.15.4. Determine the heading to the desired fix by connecting your present position to your desired fix
with an imaginary line on the RMI (B to C). Establish another imaginary line parallel to the line labeled
B to C through the center of the RMI. This line will indicate your no-wind heading to your desired fix
(030o).
5.15.5. Turn to 030o and apply any drift correction. With 5o right drift, we would turn to 025o.
5.15.6. Cross-check your position continually and correct as necessary.
5.16. Fix-to-Fix Navigation (Using the MB-4 Computer). A fix-to-fix can also be computed on the
wind face side of an MB-4 computer. First, give the pilot a general heading toward the fix. (NOTE: You
can work in bearings; however, all work must be done in either bearings or radials to compute the
solution.) For the following example, radials will be used. The fix you wish to navigate to is the 280o
radial at 30 DME. Set up a graphic depiction on the wind face side of your computer with your present
position (350o radial at 050 DME) and the desired fix (280o/030). Use the following steps:
5.16.1. Place your present position (350o/050) on the wind face side using the square grid at the bottom
of the MB-4. Align 350o on the compass rose under the true index. Mark the point by counting down 50
NM from the true airspeed (TAS) grommet and mark with a +. Use the scale set up on the square grid or
set up an applicable scale. The scale used must remain constant throughout the problem (Figure 5.13).
5.16.2. Place the fix radial and DME (280o/030) on the computer the same way you did in step one
(Figure 5.14). Mark as a fix symbol (Δ).
5.16.3. Determine the no wind heading by rotating the compass rose so that the present position (+) is
directly above the fix (Δ). Use the square grid at the bottom to help with alignment (Figure 5.15). Turn
the aircraft to MC under the true index (206o for this example) and kill the drift. (NOTE: You can place
your present position (+) on the 0 NM horizontal baseline then, using your NM increment scale, count
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