Advisory Circular (AC) 23.629-1B, Means of Compliance With Title 14 CFR, Part 23, § 23.629, Flutter

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This notice announces the issuance of Advisory Circular (AC) 23.629-1B. This advisory circular presents information and guidance to provide one means, but not the only means of complying with Sec. 23.629, Flutter (including divergence, and control reversal) of part 23 of the Federal Aviation Regulations. Accordingly, this material is neither mandatory nor regulatory in nature. The complexity of flutter analysis has historically prompted endeavors to find simplified methods of flutter substantiation. The advent of electronic computers has de-emphasized the need to make drastic assumptions previously necessary to enable mathematical treatment of the flutter phenomenon. However, there remains a need to simplify flutter solution as much as possible consistent with safety in order to minimize the cost and effort required to show freedom from flutter. Past experiences gained by the necessity to judiciously choose degrees of freedom, and by the need to make essential parametric studies has resulted in a generally recognized set of good practices. These good practices form the basis for this advisory circular. The draft advisory circular was issued for Public Comment on February 25, 2004 (