9-42
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Traffic
9.9.3.1
Resolution Advisories
Resolution Advisories (RAs) are TCAS II recommended vertical guidance
maneuvers to be flown to resolve a traffic conflict. If the targeted threat
aircraft is also TCAS II equipped, the two traffic systems use Mode S data
link interrogations to generate complimentary responses to the RAs. During
an RA event, the system monitors the performance and status of the aircraft
response. It may command an increase/decrease vertical speed, and/or reverse
climb/descend commands until the aircraft is clear of the conflict.
RAs are categorized in two resolution types, preventive and corrective:
Preventive Resolutions
Preventive RAs are issued when the aircraft's present vertical speed
will
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
into conflicting traffic.
Corrective Resolutions
Corrective RAs are issued when the aircraft's present vertical speed
will
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.
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
determines it will be necessary to cross through the intruder aircraft’s altitude to
resolve the traffic conflict.
Summary of Contents for GTN 625
Page 608: ...This page intentionally left blank ...
Page 609: ......
Page 610: ...190 01004 03 Rev P ...