Garmin GPS 400W Pilot's Manual Addendum - Page 42

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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

En Route

Terminal

Approach

Departure

Minimum TERRAIN Clearance Values for RTC/ITI Alerts

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Level Flight

Descending

700 ft.

500 ft.

350 ft.

300 ft.

150 ft.

100 ft.

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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.

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