Garmin GTN 625 Pilot's Manual page 284

9.9.3.1
Foreword
Resolution Advisories (RAs) are TCAS II recommended vertical guidance
Getting
maneuvers to be flown to resolve a traffic conflict. If the targeted threat
Started
aircraft is also TCAS II equipped, the two traffic systems use Mode S data
Audio &
link interrogations to generate complimentary responses to the RAs. During
Xpdr Ctrl
an RA event, the system monitors the performance and status of the aircraft
Com/Nav
response. It may command an increase/decrease vertical speed, and/or reverse
climb/descend commands until the aircraft is clear of the conflict.
FPL
RAs are categorized in two resolution types, preventive and corrective:
Preventive Resolutions
Direct-To
Preventive RAs are issued when the aircraft's present vertical speed will
Proc
resolve a traffic conflict. The system displays a range of vertical speed avoidance
limits. These limits are displayed to help the pilot from climbing or descending
Wpt Info
into conflicting traffic.
Corrective Resolutions
Map
Corrective RAs are issued when the aircraft's present vertical speed will
Traffic
not resolve a traffic conflict. The VSI indicates a range of vertical speeds to be
avoided,while the current vertical speed appears in white with a red background.
Terrain
For advisory, the VSI indicates a green "fly to" vertical speed range that needs
to be flown to resolve the RA conflict. In some cases, the TCAS II system logic
Weather
determines it will be necessary to cross through the intruder aircraft' s altitude to
resolve the traffic conflict.
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
9-42
Resolution Advisories
GTN 625/635/650 Pilot's Guide 190-01004-03 Rev. P