AeroNav 900/880 Series Pilot’s Guide
89000039-010
Rev 1 May 2019 Map Subsystem 4-41
EXCESSIVE DESCENT RATE (EDR)
The excessive rate of descent alerts are intended to be always
active, even in the vicinity of an airport. There is a caution area for
high rates of descent and a warning area for even higher rates of
descent. The figure below depicts the yellow caution area in which a
“Sink Rate” aural alert and associated yellow caution CAS message
is issued and then a red warning area in which a “Pull Up” aural alert
and associated red warning CAS message is issued.
The excessive rate of descent aurals will continuously repeat every 6
seconds until either the message is acknowledged or the condition is
no longer valid.
The “Pull Up” warning will provide between 0 and 12 seconds of
warning depending on aircraft altitude at the time. “Sink Rate”
cautions add approximately 12% to 33% to those numbers based on
aircraft altitude. Aircraft vertical speed and current terrain elevation
below the aircraft are used to compute the alerting altitude
thresholds.
The Excessive Descent Rate (EDR) alert is triggered at -1600 fpm.
“Pull Up” EDR warnings are the most serious/highest priority of all
TAWS alerts, even higher than FLTA warnings.
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