Avidyne IFD540, Руководство пилота

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Map Pages 3-29
FORWARD LOOKING TERRAIN ALERTING (FLTA)
The optional FLTA function looks ahead of the airplane along and
below the airplane’s lateral and vertical flight path and provides
suitable alerts if a potential CFIT threat exists. FLTA alerting is
triggered by either a projected imminent impact with terrain or
obstacle
or reduced terrain and obstacle clearance. Projected
imminent impact with terrain occurs when the aircraft flight path is
projected to intersect with terrain up to 3.0nm (1.2nm for
helicopters) for a yellow caution or up to 1.5nm (0.6nm for
helicopters) for a red warning in front of the aircraft flight path. By
way of reference, this means an aircraft traveling at 180 knots of
ground speed will have 60 seconds of notice for a caution and 30
seconds for a warning. Reduced terrain or obstacle clearance
occurs when the aircraft flight path is not projected to impact the
terrain but the projected clearance between the aircraft flight path
and nearby terrain or obstacles falls below a designated safe
vertical distance. The reduced terrain and obstacle clearance
distance varies with phase of flight and aircraft dynamics per
TAWS TSO C-151c (TSO C-194 for helicopters) but generally
ranges from 300’ to 1000’ (100’ to 150’ for helicopters).
Either terrain or obstacles can trigger FLTA alerts and they are
distinguished via the CAS messaging and aural alerting. The
difference between FLTA warnings and cautions is exclusively
based on distance-to-go to projected impact points or reduced
clearance areas.
Each unique FLTA alert will generate a new Master Caution lamp
illumination (flashing yellow or red “AUX” Page Function key), a
new CAS message, a new aural alert, and display the elliptical
solid yellow/red coloration on the maps.
Each unique FLTA alert can be acknowledged by touching the
CAS message or pressing the “CLR” function key on the right
edge of the IFD which turns off the Master Caution lamp flashing,
the CAS message and the aural alert. The FLTA
acknowledgment does not turn off the solid red or yellow
coloration on the maps.