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Thread: Could only get one Magnetometer to align plus two other questions

  1. #1
    Junior Member
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    Mar 2010
    Location
    Sugar Grove, IL
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    6

    Could only get one Magnetometer to align plus two other questions

    I have one AF3400 and one AF3500 installed. Two magnetometers. Got the right side magnetometer alignment done with out problem. The left side stopped at step 13 with a message that says:

    Magnetometer calibration cannot continue
    EFIS unit requires a power cycle
    Power cycle unit or press return to quit calibration
    .

    While doing the alignment for the right side, the left EFIS heading was moving around. At one point it's heading was the same as the right side, but I still could not get it to calibrate.

    On a previous post did I read correctly that if you have two AHRS you need to have two OAT probes? That doesn't seem to make sense since the units should talk to each other.

    Last question: how do you zero out the tach and hobbs time? My EFIS shows 65 hours on the tach and 87 on the hobbs. Today I did my first engine start, so I'm confident those times are not correct.

    Thanks in advance,
    John

  2. #2
    Junior Member
    Join Date
    Mar 2010
    Location
    Sugar Grove, IL
    Posts
    6
    Adding a correction. I should have asked what a power cycle is and how do you do it? I did turn the unit off then
    on again, but that did not correct the message.
    Joh

  3. #3
    Turn off power to the EFIS screen and wait for it to shut down and then power up and try it again.

    Each EFIS screen with an AHRS should have its own OAT probe. The OAT probe is used for TAS and density altitude calculations on the EFIS.

    You can set the Tach and Hobbs in Instrument Calibration > 1. Admin Settings > 23. Set Tach and Hobbs Time
    Rob Hickman
    Advanced Flight Systems Inc.

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