Garmin GTN 650 Pilot's Guide - Page 196

Foreword Getting Started Xpdr Ctrl Com/Nav Flight Phase En Route Terminal Approach Departure Minimum Clearance Altitude (feet) Level Flight Descending 700 500 350 300 150 100 100 100 Table 10-4 FLTA Alert Minimum Terrain and Obstacle Clearance Values FPL During final approach, FLTA alerts are automatically inhibited when the aircraft is below 200 feet AGL while within 0.5 NM of the approach runway or Direct-To below 125 feet AGL while within 1.0 NM of the runway threshold. Proc 10.3.8.4 Premature Descent Alerting A Premature Descent Alert (PDA) is issued when the system detects that the Wpt Info aircraft is significantly below the normal approach path to a runway. Map 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 Traffic 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, Terrain and other parameters.  Weather  (EIGHT!BOVE4ERRAIN&EET  Nearest  Music   Utilities  0$!!LERTING!REA System Messages 2UN WAY 4HRESHOLD $ISTANCE&ROM$ESTINATION!IRPORTNM Figure 10-13 PDA Alerting Threshold Symbols Appendix 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. Index 10-16 Garmin GTN 625/635/650 Pilot's Guide 190-01004-03 Rev. B