5-138 Pilot’s Guide 190-02327-03 Rev. C
Hazard Awareness
HTAWS Alerts
• HTAWS alerts employ either a CAUTION or WARNING alert severity level
• Visual annunciations display when alert is issued
• Aural alerts are simultaneously issued
• Annunciations appear in dedicated field in the lower left corner of the display
• HTAWS Caution Alerts display as constant black text on a yellow background
• HTAWS Warning Alerts display as constant white text on a red background
FORWARD LOOKING TERRAIN AVOIDANCE
Unit issues terrain alerts when the aircraft altitude is below the terrain elevation and
when aircraft is projected to come within minimum clearance values of the terrain.
Any threat locations are depicted on the display. There are two levels of severity for
FLTA alerts. They are cautionary (amber) and warning (red).
FLTA Caution:
• Estimated potential impact in approximately 30 seconds after a caution
pop-up alert and
annunciation
• Accompanied by the aural message “Caution Terrain; Caution Terrain”
• 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 issued 15 seconds prior to estimated potential impact in
normal mode and approximately 10 seconds in RP mode
• Accompanied by the aural message “Warning - Terrain, Terrain” or “Warning -
Obstacle, Obstacle”
• The time to an alert can vary with conditions, therefore there is no guarantee of
a 15/10 second warning alert being issued
HTAWS VOICE CALL OUT (VCO) AURAL ALERT
• VCO aural alert messages provide an advisory alert to the pilot the aircraft is
between 500 feet and 100 feet above terrain in 100 foot increments
• When the aircraft descends within the selected distance from 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
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