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PDA Severity Levels

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".

Excessive Descent Rate Alert (EDR)

The purpose of the Excessive Descent Rate alert

is to provide suitable notiﬁcation when the aircraft is

determined to be closing (descending) upon terrain

at an excessive speed. The parameters for the alert as

deﬁned by TSO-C151b are shown in the Descent Rate

graph.

Part Three: Section 3

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"PULL UP"

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Excessive Descent Rate Graph

Excessive Descent Rate Severity Levels

CAUTION—The annunciation and pop-up terrain

alert are accompanied by the aural message "Sink

Rate".

TAWS Alerts

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