4
Revision G
October 14, 1996
2.2. OPERATION (CONTINUED)
The display has no meter movements and is entirely electronic. The actual VOR and
localizer course widths at full scale are the same as conventional needle-type instruments;
however, since the scale is larger, smaller off-course indications can be seen which means
that corrections can begin sooner without over-correcting.
The course is displayed in light bar increments or digitally.
The indicator also features two automatic modes that continuously present the radial
“FROM” or bearing “TO” the VOR station.
A switch for TO-FROM control is provided. The TRI NAV has options to include display of
two VOR’s simultaneously. A remote switch is necessary to switch NAV 2 into the NAV 1
position on the display.
The Glide Slope Deviation Bar indicates deviation from the glide slope center line. A
flagged indication for glide slope is no vertical bar(s) illuminated. Also, the mode indicator
will revert to “L” for localizer instead of “I” for ILS.
In the lower right quadrant a second VOR bearing or radial may be digitally displayed. This
allows two different NAV receivers to be displayed on a single indicator. Typically, NAV 1
would be displayed on the OBS deviation bar and NAV 2 would be displayed on the NAV 2
digital radial display. The lower right toggle switch allows you to change the digital window
radial reading “TO” the station bearing TO the VOR station. Selecting FR allows you to
select the “FROM” radial from the VOR station. The lack of a second or NAV 2 signal will
cause the window to read OFF. A remote switch can be installed to transfer NAV 2 to the
NAV 1 position. A digit numeral 2 will light below the OBS/NAV window to indicate this
mode.
When the lower right switch is positioned in the center position a 0 to 10 minute timer is
activated to aid in standard rate turns, etc. The time can be reset by switching up or down
and moving back to center. Time will immediately be restarted from zero and will count
minutes and seconds.
A push-button to the right of the NAV 2 TO/TIME/FR switch has two functions. When the
NAV 1 TO/OBS/FR/BC switch is in the TO or FR position and the OBS/TEST button is
momentarily pushed and then the NAV 1 switch is moved to the OBS position, the unit will
automatically center, putting you right on course center line TO or FROM the VOR station.
This feature saves rotating the OBS knob to find the radial TO or FROM the VOR.
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