Forward Looking Terrain Alerting (Flta) - BENDIXKing AeroNav 910 Pilot's Manual

AeroNav 900/880 Series Pilot's Guide

FORWARD LOOKING TERRAIN ALERTING (FLTA)

The FLTA function looks ahead of the airplane projecting the
airplane's lateral and vertical flight path and provides suitable alerts if
a potential terrain or obstacle 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
AeroNav 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.
The projected imminent impact location or the projected reduced
terrain and obstacle clearance area is depicted on the maps with a
solid yellow (caution) or red (warning) "flashlight" elliptical depiction.
Depending on aircraft dynamics, it may be possible for a solid red
89000039-010
Rev 1 May 2019 Map Subsystem 4-33