To operate the Count Down timer:
1) Press the FUNC key until COUNT DOWN is displayed.
2) Press CRSR and use the 0 - 9 keys to set the initial time. All digits must be entered (use
the 0 key to enter leading zeros).
3) Press START/STOP to begin count down.
4) Press START/STOP again to pause the timer.
5) When the Count Down timer expires, the COUNT DOWN banner is replaced with a
flashing EXPIRED, the message "Timer Expired" is heard, and the time begins counting up.
6) Press CLR to reset the timer to the initial time value.
Automatic ALT Mode Switching
If the GTX 330 is configured for Automated Airborne Determination, the system
automatically switches to ALT Mode when takeoff is sensed.
NOTE: Automatic mode switching can be disabled in software version
8.03 and later by setting Auto-ALT to OFF during installation configuration.
Failure Annunciation
If the unit detects an internal failure or an ADS-B transmission failure, the screen displays
FAIL. When FAIL is annunciated no transponder data is transmitted.
Altitude Monitor Operation
To operate the Altitude Monitor:
1) Climb to assigned altitude.
2) Press the FUNC key until ALT MONITOR is displayed.
3) Press START/STOP key to start monitoring altitude.
4) Press START/STOP key again to cancel Altitude Monitor.
Altitude deviation is shown in hundreds of feet ABOVE or BELOW the selected altitude.
When the aircraft' s altitude exceeds the deviation limit, ABOVE or BELOW flashes and an
audio tone or the message "Leaving Altitude" is heard. ABOVE or BELOW flashes until the
aircraft returns to within 100' of the selected altitude.
To select a new monitored altitude, press the START/STOP key to deactivate, then press
again to activate the new monitored altitude.
If another function is selected for viewing, such as a Timer or Pressure Altitude, the
Altitude Monitor is automatically displayed with a flashing alert when the altitude excursion
exceeds the configured deviation value. The Altitude Monitor stops when the current
deviation exceeds 1000 feet plus the configured deviation value.
The maximum configured deviation values that can be set by a Garmin authorized service
center are as follows:
Flight Level or Feet Maximum Limits – 300 feet BELOW, 0 feet to 1999 feet ABOVE
Meters Maximum Limits – 300 meters BELOW, 0 meters to 609 meters ABOVE
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