IFD400 Series Pilot Guide
1-22 System Overview
COOL FEATURE
Shortcuts to Com Tuning
Shortcuts are provided to aid speed and ease of
manually entering a communications frequency in
the IFD. For example, there is no need to type the
leading “1” for frequencies, the decimal point, trailing
zeros or the thousandth digit. For 121.700, type
“217” and press Enter.
Emergency Com Frequency
121.5 MHz can be quickly put into the Active communications slot
by pressing and holding the bezel frequency swap button for
approximately three seconds. The frequency that had been
active is swapped into the standby.
Stuck Mic
If the IFD determines that there is a stuck mic situation (defined
as 30 seconds or more of continuous transmission), a “Stuck Mic”
CAS message will be displayed and the transmitter will be
disabled until the stuck mic condition is resolved.
Alternate Tuning Controls
The IFD has the capability to receive external inputs for tuning
preset frequencies and swapping the standby frequency into the
active. These inputs are typically driven by dedicated buttons
installed on the stick/yoke, allowing for radio control while the
pilot’s hands remain on the controls. The inputs/buttons are as
follows:
Next frequency
Previous frequency
Swap frequency
The IFD contains a list of up to 16 user-configurable preset
communications frequencies (see page 4-6). When the “next
frequency” or “previous frequency” button is activated, the next or
previous defined frequency in the list, respectively, will be placed
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