Garmin GTN 750 Pilot's Guide - Page 242

Foreword Getting Started Audio & 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 11-4 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 11.3.8.4 Premature Descent Alerting A Premature Descent Alert (PDA) is issued when the system detects that the Charts aircraft is significantly below the normal approach path to a runway. Wpt Info 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 Map 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, Traffic and other parameters.  Terrain  (EIGHT!BOVE4ERRAIN&EET  Weather  Nearest   Music  0$!!LERTING!REA Utilities System 2UN WAY 4HRESHOLD $ISTANCE&ROM$ESTINATION!IRPORTNM Figure 11-13 PDA Alerting Threshold Messages 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 Symbols appropriate. When TAWS is inhibited, the alert annunciation "TER INHB" is shown. Appendix Index 11-16 Garmin GTN 725/750 Pilot's Guide 190-01007-03 Rev. B