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Thread: Two EFIS's one OAT probe?

  1. #1
    Junior Member
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    Mar 2010
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    Petaluma, CA
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    Two EFIS's one OAT probe?

    Is it possible to share the output of one AFS OAT probe with two AFS EFIS's? My apologies if this question has been answered here before.

    I realize that the probe will be powered by only one EFIS. I also promise to ground both EFIS's to a common ground point via the case grounds and the power grounds.

    Thanks,

    Chuck

  2. #2
    Hi Chuck,

    Yes you can share the OAT between screens, but not if both screens have air data input. If both screens have air data input, each needs its own OAT probe. What types of units do you have? EE, EFIS, EM, MFD??
    ---
    Trevor Conroy
    Technical Support
    Advanced Flight Systems
    Support@Advanced-Flight-Systems.com

  3. #3
    Junior Member
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    Mar 2010
    Location
    Petaluma, CA
    Posts
    17
    Trevor,

    I am planning installation of a second screen. Both screens will have air data input. I would like to share the output of one OAT probe with both screens.

    It is my understanding that the output of the probe is a voltage that varies from roughly 0 to 5 Volts depending on temperature. I am curious why two EFIS units could not be connected to the output of one OAT probe. I realize that only one EFIS will power the probe.

    Thanks,

    Chuck

  4. #4
    Chuck, if both screens have air data input, they will need their own OAT probe. It uses microamps/degree(K), which is current rather than voltage so you would be splitting the current in half if you connected it to two screens thereby leading to an inaccurate temperature reading.
    ---
    Trevor Conroy
    Technical Support
    Advanced Flight Systems
    Support@Advanced-Flight-Systems.com

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