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Thread: Density Altitude

  1. #1

    Density Altitude

    Yesterday when leaving Tucson (in an MD-80) the airplane was over the maximum allowable gross weight for the elevation and temperature (2650 feet and 106 degrees). With enough fuel for a non-stop to Atlanta, they had to either convince ten people to get off so they threatened to start randomly removing baggage until they got the weight down. I guess they were serious. Eventually enough people volunteered to get off, so we were able to leave with only a short delay while they sorted through the baggage to find what belonged to the volunteers. And I thought that only GA aircraft had to choose between fuel and people. In the summer I keep the fuel load below 40 gallons and try to have only one other person in the plane.

    Carl Foster Sundowner 9761L Tucson AZ

    [Non-text portions of this message have been removed]



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  2. #2

    Density Altitude

    My wife still doesn't understand why I call our B19 Sport a 3-seater.
    Nearly all airline flights take off with the tanks not filled & most
    airplanes are designed with enough tank capacity and cabin volume to
    allow flexibility in loading for range or payload. However, that was
    probably only indirectly the problem.

    In Part 91 operations, we legally just have to be able to get off the
    runway and not hit anything on our climb. I'll bet your airliner had
    enough power to blast out if they operated under the same rules.
    However, jets (especially in commercial use) have a balanced field
    requirement, in which they can't go if the book says they can't get to
    a certain speed AND STOP on the available runway. Air carrier runway
    requirements can be measured in miles on hot days.
    Something you'll probably also see where you live is +120 Ops. Most
    of the performance charts stop at 120F, meaning that even though the
    airplane can fly with the temperature at 120F, they are grounded at
    121F.
    Bob

    --- In musketeermail@yahoogroups.com, carlfoster@c... wrote:
    > Yesterday when leaving Tucson (in an MD-80) the airplane was over
    the maximum allowable gross weight for the elevation and temperature
    (2650 feet and 106 degrees). With enough fuel for a non-stop to
    Atlanta, they had to either convince ten people to get off so they
    threatened to start randomly removing baggage until they got the
    weight down. I guess they were serious. Eventually enough people
    volunteered to get off, so we were able to leave with only a short
    delay while they sorted through the baggage to find what belonged to
    the volunteers. And I thought that only GA aircraft had to choose
    between fuel and people. In the summer I keep the fuel load below 40
    gallons and try to have only one other person in the plane.
    >
    > Carl Foster Sundowner 9761L Tucson AZ
    >
    > [Non-text portions of this message have been removed]




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