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Part Three: Section 3
TAWS Alerts
WARNING—Estimated potential impact in approximately 30
seconds after pop-up alert and annunciation. RTC/ITI warning
alerts are accompanied by the aural message “Terrain, Terrain;
Pull Up, Pull Up” or “Terrain Ahead, Pull Up; Terrain Ahead,
Pull Up”. Similarly, a “Obstacle, Obstacle; Pull Up, Pull Up”
or “Obstacle Ahead, Pull Up; Obstacle Ahead, Pull Up” alert is
also provided.
Phase of Flight Level Flight Descending
En Route 700 ft. 500 ft.
Terminal 350 ft. 300 ft.
Approach 150 ft. 100 ft.
Departure 100 ft. 100 ft.
Minimum TERRAIN Clearance Values for RTC/ITI Alerts
During the final approach phase of flight, RTC/ITI
alerts are automatically inhibited when the aircraft is
below 200 feet AGL while within 0.5 NM of the approach
runway or is below 125 feet AGL while within 1.0 NM of
the runway.
Premature Descent Alerting (PDA)
The TERRAIN system issues a Premature Descent
Alert (PDA) when the system detects that the aircraft
is significantly below the normal approach path to
a runway. PDA begins when the aircraft is within 15
NM of the destination airport. PDA ends when the
aircraft is either 0.5 NM from the runway threshold
or is below an altitude of 125 feet AGL while within
1.0 NM of the threshold.