10-45
190-01004-03 Rev. P
GTN 625/635/650 Pilot’s Guide
Terrain
FLTA CAUTION—Estimated potential impact in approximately 30 seconds after a caution
pop-up alert and annunciation. FLTA caution alerts are accompanied by the aural message
“
Caution Terrain; Caution Terrain.
” Similarly, a
“Caution Obstacle; Caution Obstacle”
alert
is also provided. The time to an alert can vary with conditions, therefore there is no guarantee
of a 30 second caution alert being issued.
FLTA WARNING— Warning pop-up alerts are issued 15 seconds prior to an estimated
potential impact in normal mode and approximately 10 seconds in RP Mode. FLTA warning
alerts are accompanied by the aural message “
Warning- Terrain, Terrain
“
Warning - Obstacle, Obstacle
” alert is also provided. The time to an alert can vary with
conditions, therefore there is no guarantee of a 15/10 second warning alert being issued.
The alerts are annunciated visually through the annunciator status bar, a
pop-up alert box, and the red and yellow areas on the HTAWS page. The alerts
are annunciated aurally through a voice message indicating the potential threat,
such as “Caution - Terrain, Terrain” or “Warning - Obstacle, Obstacle.”
10.7.6.2 HTAWS Voice Call Out Aural Alert
The purpose of the Voice Call Out (VCO) aural alert messages are to provide
an advisory alert to the pilot that the aircraft is between 500 feet and 100 feet
above terrain in 100 foot increments. When the aircraft descends within the
selected distance from the terrain, the aural message for the selected height
above terrain is generated. There are no display annunciations or pop-up alerts
that accompany the aural message. HTAWS allows an additional 50 foot VCO
alert with radar altimeter input.
Summary of Contents for GTN 625
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