Amateur-Built Aircraft and Ultralight Flight Testing Handbook AC 90-89B

    Amateur-Built Aircraft and Ultralight Flight Testing Handbook AC 90-89B
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    • Create Date September 7, 2018
    • Last Updated September 7, 2018

    FAA Publication - AC 90-89B
    2005 edition

    This advisory circular (AC) provides suggestions and safety related recommendations primarily to assist amateur and ultralight builders in developing individualized aircraft flight-test plans. It also provides guidance for experimental light sport aircraft flight testing after modifications to the aircraft. It provides recommendations and suggestions you can combine with other sources on test flying, such as the aircraft plan/kit manufacturer’s flight testing instructions and other flight testing data. This will help you develop a detailed flight-test plan, tailored for your aircraft and resources.


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    Omar Filipovic
    Omar Filipovic is president of the Glasair Aircraft Owners Association as well as the chief tinkerer and content editor for this website. He is also the web editor for Kitplanes Magazine. Omar is building a GlaStar in Portland, Oregon.