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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 6-78).
PDA alerting begins when the aircraft is below 700 feet AGL within 15 nm of the destination airport and
ends when the aircraft is 0.5 nm from the runway threshold.
PDA and FLTA aural and visual alerts can be manually inhibited. Discretion should be used when inhibiting
TAWS and the system should be enabled when appropriate. When TAWS is inhibited, the alert annunciation
'TAWS INH' is shown on the PFD and MFD (Figure 6-79).
Inhibiting/enabling TAWS alerting:
1) Select the TAWS-B Page.
2) Press the INHIBIT Softkey to inhibit or enable TAWS (choice dependent on current state).
Or :
a) Press the MENU Key.
b) Select 'Inhibit TAWS' or 'Enable TAWS' (choice dependent on current state) and press the ENT Key.
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. See the Flight Instruments Section
for details.
190-00592-06 Rev. A
800
700
600
500
400
300
200
100
0
Distance to Destination (NM)
Figure 6-78 PDA Alerting Threshold
Figure 6-79 TAWS Alerting Disabled
(TAWS Inhibited) Annunciation
Garmin G1000 Pilot's Guide for the Diamond DA40/40F
PDA ALERTING AREA
HAZARD AVOIDANCE
335
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