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Part Three: Section 3
TAWS Alerts
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”.
PDA Severity Levels
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.
"PULL UP""PULL UP"
"SINK RA
TE"
Height Above Terrain (Feet)
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”.