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Part Three: Section 3
TAWS Alerts
WARNING— Estimated potential impact in approximately 15
seconds after alert and annunciation. FLTA 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 FLTA Alerts
NOTE: During the final approach phase of flight, FLTA
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)
TheTAWSsystemissuesaPrematureDescent
Alert(PDA)whenthesystemdetectsthattheaircraft
is significantly below the normal approach path to a
runway.PDAbeginswhentheaircraftiswithin15NM
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.
(EIGHT!BOVE4ERRAIN&EET
$ISTANCE&ROM$ESTINATION!IRPORTNM
0$!!LERTING!REA0$!!LERTING!REA
2UNWAY
4HRESHOLD
CAUTION — The above annunciation and pop-up
terrain alert are displayed during a PDA alert. For
TAWS, the PDA alert is accompanied by the aural
message “Too Low, Terrain”.
190-00356-30 Rev F