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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 (Figure 6-57).
PDA alerting begins when the aircraft is within 15 nm of the destination airport. PDA alerting ends when
the aircraft is either:
•
0.5 nm from the runway threshold
OR
•
at an altitude of 125 feet AGL while within 1.0 nm of the threshold.
TAWS I
NHIBIT
TAWS also has an inhibit mode that deactivates the PDA/FLTA aural and visual alerts. Pilots should use
discretion when inhibiting TAWS and always remember to enable the system when appropriate. Only the
PDA and FLTA alerts are disabled in the inhibit mode. For more information, see the section on TAWS
alerts.
Inhibiting and enabling TAWS:
1) Select the TAWS Page.
2) Press the INHIBIT Softkey. To enable TAWS, press the INHIBIT Softkey again.
OR:
1) Press the MENU Key. 'Inhibit TAWS' or 'Enable TAWS' is highlighted.
2) Press the ENT Key. The TAWS system is inhibited or enabled, depending on the previous status. The annunciation
is displayed in the terrain annunciator field whenever terrain is inhibited.
NOTE: If TAWS alerts are inhibited when the Final Approach Fix is the active waypoint in a GPS WAAS approach, a
LOW ALT annunciation may appear on the PFD next to the altimeter if the current aircraft altitude is at least 164 feet
below the prescribed altitude at the Final Approach Fix.
190-00692-00 Rev. B
700
600
500
400
300
200
100
Runway
1
2
3
4
5
6
Threshold
Distance From Destination Airport (nm)
Figure 6-57 PDA Alerting Threshold
Garmin G1000 Pilot's Guide for Piper PA32
"Too Low, Terrain"
"Too Low, Terrain"
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14
HAZARD AVOIDANCE
15
6-55
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