400/500 Series Garmin Optional Displays

TAWS Phase of Flight
The TAWS Phase of Flight definitions are listed below.
•Enroute Phase - Defined as when the aircraft is more than 15 NM from the
destination airport, or when the conditions for Ternimal, Approach, and Departure
Phases are not met.
•Terminal Phase - Defined as when all three of the following conditions are met:
(1) The aircraft is 15 NM or less from the destination runway.
(2) The distance to the destination runway threshold is decreasing.
(3) The aircraft is at or below (lower than) a straight line drawn between the two
points specified in Table 2-2 (relative to the destination runway).
Distance-to-Runway Height-above-Runway
15 NM 3500 Feet
5 NM 1900 Feet
Table 2-2: Terminal Phase Distance-to-Runway versus
Height-Above-Runway
•Approach Phase – Defined as when all three of the following conditions are met:
(1) The distance to destination runway threshold is equal to or less than 5 NM.
(2) The height above the destination runway threshold elevation is equal to or
less than 1900 feet.
(3) The distance to the destination runway threshold is decreasing.
•Departure Phase – Defined as when all five of the following conditions are met:
(1) It has been determined that the aircraft was previously “on-ground”.
(2) The aircraft has a vertical velocity greater than zero.
(3) The aircraft has a groundspeed greater than 35 knots.
Section 2
TAWS Operation
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