NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-22
Page
2
Code
03
MARCH 30, 2001
4 - ACTIVE BUTTON
− Push the ACT button for about 2 seconds to enable the
Frequency Select Knobs to directly retune the VIR-433 (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.
NOTE: For the first 2 or 3 seconds immediately after the TEST
button is pushed, a 2-digit diagnostic code may be
displayed in the lower window, based on the conditions
existing immediately before the test button was pushed. In
case of any problem detected, the 2-digit diagnostic code
will remain displayed in the lower window.
− The active and preset display intensity will flash modulating its
brightness from minimum to maximum indicating self-test in
progress.
− If no problem was found, the active frequency display will show
four dashes and the preset frequency display will show “00”.
− At the completion of the self-test program, the display will return
to its normal operation if no problem occurs.
− Record any diagnostic codes displayed to help maintenance
personnel in locating the problem.
6 - STORE BUTTON
− The STO button allows up to four preset frequencies to be
selected and entered into the controls non-volatile memory.
− To store a frequency, toggle the MEM switch until the upper
window displays the desired channel number (CH1 through
CH4); rotate de Frequency Select Knobs until the lower window
displays the frequency to be stored; push the STO button twice
within 5 seconds. After approximately 5 seconds, the control
panel will return to the normal 2-display mode of operation.
To Next Page
