Garmin G1000H Bell 407GX Pilot's Guide - Page 529
General TIS Information, Introduction, TIS vs. TAS/TCAS, TIS Limitations
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APPENDIX E GENERAL TIS INFORMATION INTRODUCTION NOTE: Aircraft without an operating transponder are invisible to TIS. The Traffic Information Service (TIS) provides traffic advisory information to non-TAS/TCAS-equipped aircraft. TIS is a ground-based service providing the relative locations of all ATCRBS Mode-A and Mode-C transponder equipped aircraft within a specified service volume. The TIS ground sensor uses real-time track reports to generate traffic notification. The G1000H System displays TIS traffic information on the Traffic Map Page of the MFD. TIS information may also be displayed for overlay on the MFD Navigation Map Page, as well as on the PFD Inset Map. Surveillance data includes all transponder-equipped aircraft within the coverage volume. The G1000H System displays up to eight traffic targets within a 7.5 nm radius, from 3,000 feet below, to 3,500 feet above the requesting aircraft. TIS VS. TAS/TCAS The Traffic Information System (TIS) is a ground-based service that requires contact with a ground station through a datalink radio in order to receive traffic information. Traffic Advisory (TAS) and Traffic Collision Avoidance Systems (TCAS) are self-contained. TAS/TCAS uses an airborne interrogator with a half-second update rate, while TIS utilizes the terminal Mode-S ground interrogator and accompanying data link to provide a five-second update rate. TIS and TAS/TCAS have similar ranges. TIS LIMITATIONS NOTE: TIS is not intended to be used as a collision avoidance system and does not relieve the pilot of the responsibility to "see and avoid" other aircraft. TIS shall not be used for avoidance maneuvers during instrument meterorlogical conditions (IMC) or when there is no visual contact with the intruder aircraft. NOTE: Refer to the TIS Limitations section of the Aeronautical Information Manual (AIM) for a more comprehensive explanation. TIS relies on surveillance of the Mode-S radar system, which is a "secondary surveillance" radar system similar to that used by ATCRBS. Many limitations are inherent in secondary radar surveillance. Information provided by TIS is neither better nor more accurate than the information used by ATC. TIS is intended only to assist in visual acquisition of other aircraft in visual meterological conditions (VMC). While TIS is a useful aid for visual traffic avoidance, system limitations must be considered to ensure proper use. No recommended avoidance maneuvers are given, nor authorized, as a direct result of a TIS intruder display or TIS advisory. • TIS operation may be intermittent during turns or other maneuvering. • TIS is dependent on two-way, line-of-sight communications between the aircraft and the Mode-S radar antenna. Whenever the structure of the aircraft comes between the transponder antenna and the groundbased radar antenna, the signal may be temporarily interrupted. • Other limitations and anomalies associated with TIS are described in the AIM. 190-01255-00 Rev. A Garmin G1000H™ Pilot's Guide for the Bell 407GX 517