5-124 Pilot’s Guide 190-02327-03 Rev. C
Hazard Awareness
TAWS-A
FEATURE REQUIREMENTS
• Valid terrain/obstacle/navigation database
• Valid 3D GPS position
• Valid flap and landing gear status inputs
• Valid radar altimeter
• Valid air data computer
Class A TAWS incorporates radar altimeter input with the GSL altitude to provide a
more accurate position reference when at lower altitudes for certain alert types, and
to retain a level of ground proximity warning capability in the unlikely eve
nt of a
navigation, terrain or obstacle database failure.
TAWS-A Setup Selections
Tap Menu to access setup options. Selections are grouped by function: View, Layers,
and TAWS.
TAWS-A Features
• Optional TSO-C151d Class A terrain alerting system
• All Terrain-FLTA functions plus: premature descent, excessive descent and
closure rate, negative climb rate, flight into terrain, excessive below
glideslope/glidepath deviation
• Visual and aural annunciations when terrain and obstacles are within the given
altitude threshold from the aircraft
INHIBIT
Manually inhibits FLTA or PDA visual alerts for low alt
itude
approaches.
AUTOMATIC
INHIBIT
Automatically inhibits FLTA alerts when the aircraft meets the
following approach criteria.
• Altitude <200 ft above runway elevation
• Position <0.5 nm off approach end or between each
runway end
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