Garmin GDL 88 Pilot's Manual

Also see for GDL 88: Installation manual

Garmin GDL 88 Pilot's Manual Manual pdf 26 page image

4-6Garmin GDL 88 ADS-B Transceiver Pilot’s Guide 190-01122-03 Rev. CWhen a GDL 88 and TAS/TCAS system are integrated, the GDL 88 controls themode of the TAS/TCAS system using the air/ground logic in the GDL 88, as wellas from the mode controls available on the interfaced display.4.2.3 No-Heading Source Traffic InformationWhen a GDL 88 and TAS/TCAS are integrated in an airplane without a headingsource, they are subject to certain limitations:• While on the ground, display of TCAS traffic and ADS-B traffic are mutuallyexclusive.• TCAS (heading referenced traffic) and ADS-B traffic are allowed to bedisplayed on the traffic page concurrently in a Track Up orientation whileairborne, but bearing of the TCAS targets relative to ADS-B targets will slewedby the crab angle of the aircraft.• Traffic is not displayed on the moving map with ground features depicted.Traffic will always be available for display on the traffic page.4.2.4 Conflict Situational Awareness (CSA)Conflict Situational Awareness is an alerting algorithm that provides TCAS-like Traffic Alerts on ADS-B, ADS-R, and TIS-B targets to enhance situationalawareness.The GDL 88 issues an aural alert when a Conflict Situational Awareness (CSA)alert is displayed: “Traffic-O’Clock,, ” spoken once, (where is theclock position of the intruder, ”, is the relative position (Above, Below), and is the range in nautical miles).As in some TCAS I TA implementations, altitude above terrain is used to adjustthe sensitivity of the CSA algorithm to minimize nuisance alerts. Radar Altitude(if available), Height Above Terrain (as provided by a GNS or GTN navigator witha terrain database), and Geodetic Altitude are used to adjust the sensitivity of theCSA algorithm.Radar Altitude (if available), Height Above Terrain (if available), and GeodeticAltitude are used to adjust the sensitivity of the CSA algorithm, in accordance withthe following table: