Avidyne IFD540 Manual de Instalação descarregar pdf (Página 101)

Map Pages 3-23

FORWARD LOOKING TERRAIN ALERTING (FLTA)

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 (yellow caution) or up to 1.5nm (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-151b but generally

ranges from 300’ to 1000’.

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.

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 FLTA “flashlight” projected terrain impact point to

appear on top of a larger hatched yellow TA depiction.

FLTA Depiction

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Avidyne IFD540 Manual de Instalação Página 101