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Altitude Trend Indicator
When the ‘PRESSURE ALT’ page is displayed, an arrow may be displayed to the right of
the altitude, indicating that the altitude is increasing or decreasing. One of two sizes of arrows
may be displayed depending on the rate of climb/descent. The sensitivity of these arrows is set
using the GTX 330 Confi guration Mode vertical speed rate.
Timer Operation
To operate the Flight Timer:
1. Press the FUNC key until ‘FLIGHT TIME’ is displayed.
2.
If the GTX 330 is confi gured with Automated Airborne Determination, the timer will begin auto-
matically when the unit senses that the aircraft has become airborne. The timer may be reset to
zero at every lift off, continue accumulating time at lift off or may be controlled manually.
3. If desired, you may press START/STOP to pause or restart the timer.
4. Press CLR to reset the timer to zero.
5. If the timer is confi gured to start automatically it will pause when the Automated Airborne
Determination senses that the aircraft is on the ground.
To operate the Count Up timer:
1. Press the FUNC key until ‘COUNT UP’ is displayed.
2. If necessary, press CLR to reset the Count Up timer to zero.
3. Press START/STOP to count up.
4. Press START/STOP again to pause the timer.
5. Press CLR to reset the timer to zero.
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 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
fl ashing ‘EXPIRED’, and the time begins counting up.
6. Press CLR to reset the timer to the initial time value.
Automatic ALT/GND Mode Switching
If the GTX 330 is confi gured with Automated Airborne Determination, normal operation
begins when liftoff is sensed. When the aircraft is on the ground the screen automatically
displays GND. The transponder does not respond to ATCRBS interrogations when GND is
annunciated. When a delay time is set in the Confi guration Mode, the GTX 330 waits a speci-
fi ed length of time after landing before changing to GND mode.
Failure Annunciation
If the unit detects an internal failure, the screen displays FAIL.