Cruise / Enroute 5-39
Runway Suppression Area Depiction
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 TVV 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 TVV 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 TSO C-151b but generally ranges from 300’ to
1000’.
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