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190-00595-01 Rev. B
Garmin G1000 Pilot’s Guide for the Beechcraft A36/G36
309
HAZARD AVOIDANCE
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICES INDEX
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 6-52).
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 AreaPDA Alerting Area
Runway
Threshold
Figure 6-52 PDA Alerting 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 INHB’ is shown on the PFD and MFD (Figure 6-53).
Figure 6-53 TAWS Alerting Disabled
(TAWS Inhibited) Annunciation
Inhibiting/enabling TAWS alerting:
1) Select the TAWS Page.
2) Press the MENU Key.
3) 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.