TAWS Inhibit Button (If Equipped)
If your airplane is equipped with GDU software version 12.03 or higher, an
optional center instrument panel-mounted, illuminated button is available
that allows single-action inhibit of Premature Descent Alerting and Forward
Looking Terrain Avoidance TAWS annunciations.
Altitude Alerting
Altitude Alerting provides the pilot with a visual alert when approaching the
Selected Altitude. Whenever the Selected Altitude is changed, the Altitude
Alerter is reset. The following occur when approaching the Selected Altitude:
• When the aircraft passes through 1000 feet of the Selected Altitude an
aural tone is heard. The Selected Altitude changes to black text on a
light blue background and ashes for ve seconds.
• When the aircraft passes within 200 feet of the Selected Altitude, the
Selected Altitude changes to light blue text on a black background and
ashes for ve seconds.
• Upon reaching the Selected Altitude, if the pilot ies outside the
deviation band (± 200 feet of the Selected Altitude) an aural tone
is heard. The Selected Altitude changes to yellow text on a black
background and ashes for ve seconds.
Figure 7-35 – Altitude Alerting Visual Annunciations
Low Altitude Annunciation
When the Final Approach Fix (FAF) is the active waypoint in a GPS WAAS
approach using vertical guidance, a Low Altitude Annunciation may appear if
the current aircraft altitude is at least 164 feet below the prescribed altitude
at the FAF. A black-on-yellow LOW ALT annunciation appears to the top left
of the Altimeter, ashes for several seconds, then remains displayed until the
condition is resolved.
Figure 7-36 – Low Altitude on GPS WAAS Approach
NOTE: A Low Altitude Annunciation is available only when WAAS is
available. This annunciation is not shown, unless TAWS is inhibited.
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