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TX56/56A and TX57/57A Installation Manual
5 April 2022
01776-00-01
Issue AD
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Page 52
Trig Avionics
selected for the TX56 CDI, and the left/right movement of the main CDI
needle will be repeated on the screen of the TX56. The tuning knobs on the
TX56 will have no effect.
If the tuned station is out of range, the CDI display will be crossed out and no
left/right needle will be displayed.
If you have an external CDI which has its own built-in converter, such as a
legacy Bendix/King indicator, OBS mode will not be available – you should
use the external CDI in the usual way.
8.6 T/F (To/From) Button
When the Nav receiver is tuned to a VOR that is in range the system will
decode the radial that you are flying over. The normal display is the radial
from the beacon – that is, the outbound radial. If you want to see the magnetic
track to follow to get to the beacon, pressing the T/F button will flip the
display to show bearings to the beacon. Pressing again will toggle back to
displaying the radial from the beacon.
8.7 Localizer Back-Course Approaches
In some parts of the world there are approaches based on tracking a localizer
back course. The TX56 can automatically reverse the course indications for
you, so that the CDI needle works in the correct sense. If a localizer frequency
is active on the primary Nav channel, press and hold the T/F button for 5
seconds to turn on the back course sensing. An icon
BC
will be shown on the
screen, and if you are using a Trig TI106 CDI, a BC annunciation will also
appear on the CDI.
8.8 On/Off, Volume, Squelch, Ident Knob
The left hand knob controls the power to the radio and adjusts the audio
volume. Turning this knob clockwise will switch on the radio and then
increase the volume. Turning anticlockwise will reduce the volume and
eventually will click off. Both the Com radio and Nav radio volume are
controlled at the same time, whichever screen is showing.
When the display is in communication radio mode, pressing the end of this
knob toggles the automatic squelch on and off, which can be used to listen for
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