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4 Answers

G1000 TCAS

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Aircraft Systems

How does a G1000 equipped aircraft (c172) "see" other traffic around? Based on their transponder?

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4 Answers



  1. John D Collins on Apr 03, 2015

    Although I suspect a G1000 C172 could install a TCAS or TAS system, I suspect that they have a mode S transponder that can receive Mode S TIS traffic. This system is based on an ASR9 ground radar system that uplinks the nearest 8 targets that are within its service volume. The traffic displayed may be up to +3500 feet/-3000 feet and within 6 NM of the aircraft’s position, This system is available around about 100 sites in the US and extends out 50 to 60 NM from the radar site. The data update rate is about once every 5 or 6 seconds.

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  2. Shea Koenig on Apr 03, 2015

    I think what they’re are referring to would be the G1000 ADSB system. The aircraft we use at my flight school have ADSB equipped transponders that take current gps data and broadcast this info. Then other so equipped aircraft can see this data and the system displays it like a TCAS. I.e. Traffic alerts 500ft above etc. but they will not “see” non ADSB equipped aircraft. That’s the pilots job!! Hope this helped.

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  3. John D Collins on Apr 04, 2015

    Shea,

    ADS-B is not widely available in G1000 based aircraft and as far as I am aware, there is no ADS-B display of traffic on G1000 systems, although some (very few) do support ADS-B Out. What model of aircraft are you referring to?

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  4. Adam Broun on Apr 05, 2015

    As John says, TIS is the most likely answer, although it could also be an active system like Skywatch. Does the system draw a line showing the direction the traffic is moving? If so, it’s probably TIS. But to answer your question – yes, all these systems rely on the other aircrafts’ transponders.

    Here is an article that describes some of the different systems:
    http://www.aopa.org/News-and-Video/All-News/2011/February/1/Avionics-Traffic-systems

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