Garmin G1000 Pilot’s Guide for the Hawker Beechcraft C90A/GT
190-00663-00 Rev. A
6-68
HAZARD AVOIDANCE
PREMATURE DESCENT ALERTING
A Premature Descent Alert (PDA) is issued when the system detects that the aircraft is significantly below
the normal approach path to a runway.
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 1.0 nm of the
threshold. During the final descent, algorithms set a threshold for alerting based on speed, distance, and
other parameters.
700
600
500
400
300
200
100
Height Above Terrain (Feet
)
Distance From Destination Airport (nm)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PDA Alerting Area
PDA Alerting Area
Runway
Threshold
Figure 6-74 PDA Alerting Threshold
FIVE-HUNDRED AURAL ALERT
The purpose of the aural alert message “Five-hundred” is to provide an advisory alert to the pilot that the
aircraft is 500 feet above terrain. When the aircraft descends within 500 feet of terrain, the aural message
“five-hundred” is generated. There are no display annunciations or pop-up alerts that accompany the aural
message.
Summary of Contents for G1000:Beechcraft Baron 58/G58
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