Pilot's Operating Handbook
Section 7
Description
Edition 0 - March 05, 2019
Rev. 1
Page 7.7.3
AT engagement and disengagement
AT engagement
To engage AT, press the AT button on the Garmin Mode Controller (GMC).
AT status, and associated AT mode become active.
If the AT is not engaged, AT may automatically engage if an engine or airspeed
protection is triggered. PROT AT mode temporarily appears, until the condition for
engine or airspeed protection is cleared.
AT standard disengagement
To disconnect AT in a standard manner, apply any of the following :
- Press the AT button on the GMC
- Press the AT DISC push-button on the THROTTLE lever
- Press the AP/TRIM DISC push-button on the control yoke (AP/FD will also be
disengaged)
At AT standard disengagement, an AT annunciation flashes during
approximately 5 s and one “autothrottle” aural alert is generated.
AT non-standard disengagement
The following will cause non-standard AT disengagement :
- Manually forcing on the THROTTLE lever until the AT control servo is
overridden
- AP SERVOS breaker is pulled or tripped
- FD captures the GS/GP in FMS mode
In the case of AT non-standard disengagement, the AT annunciation flashes and
the “autothrottle” aural alert is generated, until AT disengagement is acknowledged
(i.e. until either the AT DISC push-button of the THROTTLE lever or the AP/TRIM
DISC push-button of the control yoke is pressed).
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