PILOT’S OPERATING HANDBOOK
SUPPLEMENT 49
”GARMIN” G1000 TAWS SYSTEM
Edition 1 -- October 31, 2013
Rev. 0
Page 9.49.7
PREMATURE DESCENT ALERTING
A Premature Descent Alert (PDA) is issued when the system detects that the airplane is significantly below the
normal approach path to a runway (Figure 9.49.1).
PDA alerting begins when the airplane is within 15 Nm of the destination airport. PDA alerting ends when the
airplane 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.
Figure 9.49.1 - PDA alerting threshold
”
PDA Alerting Area
”
The aural/displayed messages associated with the PDA function are described in the table 9.49.3.
Alert Type
PFD/MFD TAWS Page
Annunciation
MFD Map Page
Pop-Up Alert
Aural Message
Premature Descent
Alert Caution (PDA)
(Amber)
TERRAIN
TOO LOW - TERRAIN
”Too low, Terrain”
Table 9.49.3 - PDA alerts
