1. Compare Annunciator (ACT)
2. XFR/MEM Switch
3. Frequency Select Knobs
4. ACT Button
5. TEST Button
6. Light Sensor
7. STO Button
8. Volume Control
9. Power and Mode Switch
10. Annunciators (MEM, HLD)
11. Preset Frequency Display
12. Active Frequency Display
Figure 3C-15. CTL-32 NAV Control
(6) Light Sensor.
automatically controls the display brightness.
(7) STO Button. The STO button allows up
to four preset frequencies to be selected and entered
into the control's memory. After presetting the
frequency to be stored, push the STO button. The
upper window displays the channel number of
available memory (CH 1 through CH 4); the lower
window continues to display the frequency to be
stored. For approximately 5 seconds, the MEM switch
may be used to advance through the channel numbers
without changing the preset display. Push the STO
button a second time to commit the preset frequency
approximately 5 seconds, the control will return to
(8) Volume Control. A volume control is
concentric with the power and mode switch.
(9) Power and Mode Switch. The power and
mode switch contain three detented positions. The
ON and OFF positions switch system power. The
HLD position allows the NAV frequency to be
changed, but holds the DME to the current active
(10) MEM and HLD Annunciators. The NAV
control contains MEM (memory) and HLD (hold)
annunciators. The MEM annunciator illuminates
whenever a preset frequency is being displayed in the
lower window. The HLD annunciator indicates that the
DME is held to the active frequency at time of
selection; the NAV frequency may be changed. The
upper window now displays the NAV frequency and
the lower window displays the held DME frequency.
(11) Preset Frequency Display. The preset
(inactive) frequency and diagnostic messages are
displayed in the lower window.
(12) Active Frequency Display. The active
frequency, frequency to which the VIR-32 Receiver is
tuned, and diagnostic messages are displayed in the
c. Operating Procedures.
It is not practical to provide monitoring for
all conceivable system failures. It is
possible that erroneous operation could
occur without a fault indication. It is the
responsibility of the pilot to detect such an
occurrence by means of cross-checks with
available in the cockpit.