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Garmin G1000 Cockpit Reference Guide for the DA40/40F
190-00324-07 Rev. A
10-13
SECTION 10 – HAZARD
AVOIDANCE
Premature Descent Alert (PDA)
A Premature Descent Alert is issued when the system
detects that the aircraft is significantly below the normal
approach path to a runway. The PDA alert mode functions
only during descent to land.
PDA alerting begins when the aircraft is within 15
nm of the destination airport and ends when the aircraft
is either 0.5 nm from the runway threshold OR is at
an altitude of 125 feet AGL while within 1 nm of the
threshold. During the final descent, algorithms will set a
threshold for alerting based on speed, distance, and other
parameters.
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

              



Figure 10-18 PDA Alerting
Excessive Descent Rate Alert (EDR)
The purpose of the Excessive Descent Rate alert is to
provide suitable alerts when the aircraft is determined
to be closing (descending) upon terrain at an excessive
speed. Figure 10-19 displays the correlation between
height above terrain and descent rate, resulting in the two
EDR alerts. EDR alerts have two levels of severity, caution
(sink rate) and warning (pull-up).
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   
"PULL UP""PULL UP"
"SINK RA
TE"

Height Above Terrain (Feet)
Figure 10-19 Excessive Descent Rate
Negative Climb Rate After Takeoff
Alert (NCR)
The purpose of the Negative Climb Rate After Takeoff
alert is to provide suitable alerts to the pilot when the
system determines that the aircraft is losing altitude
(closing upon terrain) after takeoff. The aural message
Don’t Sinkis given for NCR alerts, accompanied by an
annunciation and a pop-up terrain alert on the display.
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