EN
DRAFT COPY
1
Front Panel
Display
The display shows the operating mode of the transponder, the reported pressure
altitude, and the current squawk code and Flight ID. The reply indicator is active when
the transponder replies to interrogations.
The pressure altitude is displayed as a Flight Level, which is the pressure altitude in
hundreds of feet. When non-standard atmospheric conditions apply, this may not
match the altimeter indicated altitude, but will be correctly displayed by the ATC radar.
Mode Selector Knob
The knob controls the power to the transponder and the operating mode.
OFF
Power is removed from the transponder.
SBY
The transponder is on, but will not reply to any interrogations.
ON
The transponder will respond to all interrogations, but altitude reporting is
suppressed.
ALT
The transponder will respond to all interrogations.
When airborne, the transponder should always be set to ALT unless otherwise directed
by Air Traffic Control. If your installation includes a squat switch or is configured with
an automatic air/ground system, the transponder should be left in ALT mode and it
will switch automatically to GND mode on landing or whilst taxiing. GND will appear
on the display.
Push Buttons
IDENT
Press the IDENT button when ATC instructs you to “Ident” or “Squawk Ident”.
This activates the SPI pulse in the transponder replies for 18 seconds. IDENT
will appear in the display.
