AXP340 Transponder Installation Manual
10 March 2014
01201-00
Issue AF
Page 28
AVIDYNE CORPORATION
8.13 Flight Timer
The Flight Timer records the time for which the transponder has been powered on and operating in flight
mode – either ON or ALT. Press the FUNC button to display the Flight Timer.
Pressing the CLR button resets the flight time counter. Pressing the selector knob starts or stops the flight
timer. Pressing the FUNC button moves to the next screen and leaves the flight timer in the current state.
8.14 Stopwatch
The stopwatch can be used as a convenient timer. Press the FUNC button to display the stopwatch.
Pressing the selector knob starts and stops the timer. Pressing the CLR button resets the timer.
8.15 Flight ID entry
Select the Flight ID edit screen using the FUNC button. The display shows the alpha numeric characters
selected via the rotary selector knob or numeric buttons. When the correct character is shown in the flight
ID section of the screen, press the selector knob to accept and advance to the next digit. When the selector
knob is pressed on the last digit or a space, the new Flight ID will replace the previous value. If a button is
not pressed for 7 seconds, the changes are ignored and the previous code restored.
The Flight ID should correspond to the aircraft call sign entered on your flight plan. If no flight plan is
active, the aircraft registration should be used as your Flight ID. Use only letters and digits. If the Flight ID
is less than 8 characters long, entering a blank character will end it.
8.16 Altitude Monitor
The Altitude Monitor activates an audio annunciator or annunciator light (depending on installation) when
the aircraft pressure altitude differs from the selected altitude by more than 200 feet. Press the FUNC
button to display the altitude monitor enable screen. Pressing selector knob toggles the altitude monitor at
the current altitude.
When altitude monitoring is in use, “ABOVE or “BELOW” is displayed adjacent to the altitude display on
the transponder. The Altitude Monitor will automatically be disabled when the deviation exceeds 999 feet
or 300 meters. When disabled, “OFF” is displayed.
8.17 ADS-B Monitor
The ADS-B Monitor is only available on installations that include an ADS-B position source. The ADS-B
Monitor provides a display of the position information that is being transmitted in ADS-B position reports.
This can provide confirmation that the correct information is being transmitted, particularly where the GPS
source is remote from the transponder.
In the event that valid position information is NOT available from the GPS, the latitude and longitude
display will be replaced by dashes; if no valid latitude and longitude is shown then ADS-B position
information is NOT being transmitted.
Loss of ADS-B position information will also result in a WARNING message being displayed.
8.18 Alert Messages
If the transponder detects a problem, the screen will indicate WARNING and a brief statement of the
problem. Depending on the nature of the problem, your transponder may not be replying to interrogations.
Note the message on the screen and pass that information to your avionics maintenance organisation. The
WARNING message should clear when the event has cleared. Press CLR to clear the message at any time;
