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Thread: q6804

  1. #1
    Junior Member
    Join Date
    Feb 2014
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    Italy - Jordan
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    q6804

    someone can explain thats question

    If flying North with easterly drift, an aircrafts altimeter will progressively:
    A)Under-read.
    B)Remains correct.
    C)Impossible to say - it depends on the atmospheric pressure.
    D)Over-read.

    why the answer is D and not A

    thanks for your time

  2. #2
    Junior Member
    Join Date
    Feb 2014
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    Italy - Jordan
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    i solve the question, the problem was in easterly drift, mean wind from left and i considered it from right, by the way, if the wind is from left mean im going from high to low pressure, so the altimeter will over read.

    still just a little problem, the question dont say if we are in north hemisphere or south.

  3. #3
    Administrator
    Join Date
    Apr 2015
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    You are correct and the question makes the assumption that it is in the Northern Hemisphere. It should state it. In the Northern Hemisphere, with your back to the wind, the cold air or low pressure is to your left. An aircraft maintaining a constant indicated altitude would in fact be descending as the pressure levels are sloping towards the ground, so the altimter is over reading.

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