Certification of Normal Category Rotorcraft
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Certification of Normal Category Rotorcraft

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      This is a total revision of AC 27-1 dated 8/29/85, with changes 1, 2, 3, and 4 dated 9/16/87, 4/24/89, 9/12/91, and 8/18/95 respectively, incorporated. In addition, new material plus changes to existing paragraphs have been incorporated. This consolidated version is now renumbered as AC 27-1A and replaces AC 27-1 in its entirety. This revises existing material in 14 paragraphs and adds new material for 17 paragraphs. This AC does not change regulatory requirements and does not authorize changes in, or deviations from regulatory requirements. This AC establishes an acceptable means, but not the only means of compliance. Since the guidance material presented in this AC is not regulatory, terms having a mandatory definition, as used in this AC, apply either to the reiteration of a regulation itself, or to an applicant who chooses to follow a prescribed method of compliance without deviation. This advisory circular provides information on methods of compliance with 14 CFR Part 27, which contains the Airworthiness Standards for Normal Category Rotorcraft. It includes methods of compliance in the areas of basic design, ground tests, and flight tests.
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