6
MODE CONTROL
The MODE button also controls the operation mode of the
transponder.
The following table shows the progression through the states:
ALT
The transponder will respond to all interrogations.
ON
The transponder will respond to all interrogations, but altitude
reporting is suppressed.
SBY
The transponder is on, but will not reply to any interrogations.
When airborne, the transponder should always be set to ALT
unless otherwise directed by Air Traffic Control. Aircraft
installations that include a gear squat switch will automatically
select GND on landing or while taxiing.
SQUAWK CODE ENTRY
Press any of the numeric buttons (0 through 7) to start modifying
the squawk code. A new squawk code is set when the fourth
digit is entered. If the code entry is not completed within 7
seconds, the changes are ignored and the previous code
restored.
Some standard squawk codes are listed below
1200
VFR code in the USA
7000
VFR code commonly used in Europe
7500
Hijack code
7600
Loss of communications
7700
Emergency code
