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Thread: Adjusting an Airpath compass

  1. #1

    Adjusting an Airpath compass

    There are two adjusting screws behind the card that you fill in below the face of the compass.

    My understanding is you use one to adjust north-south and the other to adjust east-west. They are not clearly marked. I'm not sure which is which.

    Can anyone tell me?

    Cloyd


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  2. #2
    Cloyd,

    I just did this on my plane. The left screw adjusts N-S and the right screw adjusts E-W. You may know the proceedure but I will relay it anyway.

    Line your plane up on runway centerline and adjust your DG to runway heading (make sure gyro is spun up and reliable, good runway reference line).

    Turn plane to North heading and zero out the error with N-S.
    Turn plane to South heading and split the error difference with N-S.
    Turn plane to North and verify error is in tolerance of south, repeat if necessary.
    Turn plane to East heading and zero out the error with E-W.
    Turn plane to West heading and split the error difference with E-W.
    Turn plane to East and verify error is in tolerance of west, repeat if necessary.

    Thats the basic proceedure, pretty easy. Depending on gyro you might re-set during the procedure. I also double check heading when back on runway heading. You can then turn the plane to required compass rose positions to update the card.

    I was able to get my error to 0-1 deg on all headings and this was with old compass (but new DG).

    Steve
    Steven Murray
    N7991L - KERI

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