4-25190-01102-02 Rev. E Garmin G500 Pilot’s GuideForewordSec 1SystemSec 2PFDSec 3MFDSec 4HazardAvoidanceSec 5AdditionalFeaturesSec 6Annun.& AlertsSec 7SymbolsSec 8Glossary Appendix AAppendix BIndex4.7.3 TIS LimitationsNOTE: This section on TIS Limitations is not comprehensive. Garminrecommends the user review the TIS Limitations section of the AeronauticalInformation Manual, Section 1-3-5.TIS is NOT intended to be used as a collision avoidance system and does notrelieve the pilot of responsibility to “see and avoid” other aircraft. TIS should notbe used for avoidance maneuvers during IMC or other times when there is novisual contact with the intruder aircraft. TIS is intended only to assist in visualacquisition of other aircraft in VMC. No recommended avoidance maneuversare provided for, nor authorized, as a direct result of a TIS intruder display orTIS advisory.While TIS is a useful aid to visual traffic avoidance, it has some systemlimitations that must be fully understood to ensure proper use. Many of theselimitations are inherent in secondary radar surveillance. In other words, theinformation provided by TIS will be no better than that provided to ATC. TISwill only display aircraft with operating transponders installed.TIS relies on surveillance of the Mode S radar, which is a “secondarysurveillance” radar similar to the ATCRBS. TIS operation may be intermittentduring turns or other maneuvering. TIS is dependent on two-way, “line-of-sight” communication between the aircraft and the Mode S radar. Whenever thestructure of the client aircraft comes between the transponder antenna (usuallylocated on the underside of the aircraft) and the ground-based radar antenna,the signal may be temporarily interrupted. Other limitations and anomaliesassociated with TIS are described in the AIM, Section 1-3-5.
