Instrument Flight
Safety/Emergency Procedures
VOR FAILURE
A failed VOR system may be indicated by the
loss of the aural identification and blanking of
the VOR digital VOR bearing. If VOR steering
is selected, the VOR bearing pointer and inner
bar of the CDI is blanked. Keep in mind that
altitude affects reception, so the VOR signal
may be occluded if you are operating at low
altitude.
Figure 55 shows one of the possible indications
of a failed VOR system.
The procedure for dealing with a VOR failure is:
1. Check that you have navigation control in
your cockpit.
2. Cycle the frequency selector.
3. Check with ATC to see if the station is in
operation or select another station.
Figure 55: FAILED VOR
4. Use TACAN (if available), waypoint, or
request radar vectors.
TACAN BEARING FAILURE
A TACAN bearing failure (Figure 56) is
indicated by the blanking of azimuth in the
TACAN data block and loss of audio
identification. If TACAN steering is selected,
the TACAN bearing pointer and the
Planimetric course line or inner bar of the CDI
on the HSI display and the course deviation
situation steering arrow on the HUD are
blanked.
The procedure for dealing with a TACAN
bearing failure is:
1. Check that you have navigation control in
your cockpit.
2. Cycle the channel selector.
3. Check with ATC to see if the station is in
operation or select another station.
4. Select the VOR navigation system (if
available), waypoint, or request radar
Figure 56: FAILED TACAN BEARING
vectors.
TACAN DME FAILURE
A TACAN DME failure is indicated by the blanking of DME in the TACAN data block. If this occurs, back
up distances with the GPS/INS by entering the coordinates for the desired TACAN station taken from the
enroute chart.
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