NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-22
Page
2
Code
01
MARCH 30, 2001
4 - ACTIVE BUTTON
− Push the ACT button for about 2 seconds to enable the
frequency select knobs to directly retune the VHF-22A (active
frequency).
− The bottom window will display dashes and the upper window
will continue to display the active frequency.
− Push the ACT button a second time to return the control to the
normal 2-display mode.
5 - TEST BUTTON
− The self-test diagnostic routine is initiated in the transceiver by
pushing the TEST button.
− The active and preset display intensity will flash, modulating its
brightness from minimum to maximum indicating self-test in
progress.
− The active frequency display will show four dashes and the
preset frequency display will show “00”.
− An audio tone will be heard from the audio system.
− At the completion of the self-test program, the display will return
to its normal operation if no problem occurs.
− In case of a detected failure, “diAG” (diagnostic) letters will be
displayed in the active and a 2-digit diagnostic code will be
displayed in the preset display.
− Record any diagnostic codes displayed to help maintenance
personnel in locating the problem.
6 - STORE BUTTON
− The STO button allows up to six preset frequencies to be
selected and entered into the controls non-volatile memory.
− After presetting the frequency to be stored, push the STO
button. The upper window displays the channel number of
available memory (CH1 through CH6); the lower window
continues to display the frequency to be stored. For
approximately 5 seconds, the MEM switch may be used to
advance through channel numbers without changing the preset
display. Push the STO button a second time to commit the
preset frequency to memory in the selected location. After
approximately 5 seconds, the control will return to normal
operation.
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