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Maximum altimeter error

Discussion in 'CFI Corner' started by SHayes, Feb 25, 2010.

  1. SHayes

    SHayes New Member

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    I though it used to say in the FARs the maximum altimeter error? Is there anywhere regulatory that says what it has to be? (+/- 75 feet)
  2. N18040

    N18040 Well-Known Member

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    Not sure on the reference, but I believe the 75 ft number is just for IFR.
  3. N18040

    N18040 Well-Known Member

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    AIM 7-2-3 discusses it. I guess I was wrong about it only applying to IFR.
  4. PFGiardino

    PFGiardino Well-Known Member

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    And hence there is no "maximum allowable" when it comes to altimeter error... it's just a suggestion. However, I wouldn't be surprised to get violated in the name of careless & reckless if the situation warranted.
  5. mojo6911

    mojo6911 Well-Hung Member

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    Its in Part 43 App. E
  6. SHayes

    SHayes New Member

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    I don't see it in Part 43, App, E. I see Table II (Test tolerances) but an average pilot about to set off on an instrument flight would not know that (or care - it is for AMTs).

    Anywhere else that makes it regulatory?
  7. SHayes

    SHayes New Member

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    That may be the only answer...the AIM. I have seen people try to say it was regulatory and some people say it wasn't. You are right though, "careless and reckless" would get you for sure.
  8. SIUav8er

    SIUav8er Narcosis

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    if you dont run into something on an approach first...
  9. mojo6911

    mojo6911 Well-Hung Member

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    Part 43 requires the inspection, which requires that the altimeter be +-75 feet. We check before we fly to make sure it meets those tolerances.
  10. N18040

    N18040 Well-Known Member

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    Your reference in the AIM is referring to Scale error. The only place that appendix E mentions 75 feet is not in reference to scale error, but in reference to the hysteresis test. I don't see how this tolerance could be applied to an altimeter sitting dormant on the ramp.
  11. SHayes

    SHayes New Member

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    I agree with you. I don't think anywhere is regulatory, that's why I asked.

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