Garmin Pilatus PC_6 Guide de l'utilisateur Page 326

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Garmin G950 Pilot’s Guide for the Pilatus PC-6
190-00870-00 Rev. B
314
HAZARD AVOIDANCE
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICESINDEX
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 6-45).
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.
Figure 6-45 PDA Alerting Threshold
0
100
200
300
400
500
600
700
800
0
1
2
3
4
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Height Above Destination (Feet)
Distance to Destination (NM)
PDA ALERTING AREA
PDA and FLTA aural and visual alerts can be manually inhibited. Discretion should be used when
inhibiting TAWS-B and the system should be enabled when appropriate. When TAWS-B is inhibited, the
alert annunciation ‘TAWS INH’ is shown on the PFD and on the MFD annunciation window when terrain is
displayed (Figure 6-46).
Figure 6-46 TAWS-B Alerting Disabled
(TAWS-B Inhibited) Annunciation
Inhibiting/enabling PDA and FLTA 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-B 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.
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