[Federal Register: October 14, 2004 (Volume 69, Number 198)]
[Notices]
[Page 61067]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr14oc04-119]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
Advisory Circular (AC) 23.629-1B, Means of Compliance With Title
14 CFR, Part 23, Sec. 23.629, Flutter
AGENCY: Federal Aviation Administration, DOT.
ACTION: Notice of issuance of advisory circular.
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SUMMARY: 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 (69 FR 8728). When possible, comments received were
used to modify the draft advisory circular.
We received some comments regarding the general layout of the
advisory circular. We will consider reorganizing the content for the
next revision. Any suggestions for the reorganization will be
considered. For more information, or to make recommendations for the
improvement of this advisory circular, contact Mark James, Standards
Office, Small Airplane Directorate, Aircraft Certification Service,
Kansas City, Missouri 64106, telephone (816) 329-4137, fax (816) 329-
4090, mark.james@faa.gov.
DATES: Advisory Circular (AC) 23-629-1B was issued by the Manager,
Small Airplane Directorate on September 28, 2004.
How to Obtain Copies: A paper copy of AC 23.629-1B may be obtained
by writing to the U.S. Department of Transportation, Subsequent
Distribution Office, DOT Warehouse, SVC-121.23, Ardmore East Business
Center, 3341Q 75th Avenue, Landover, MD 20785, telephone 301-322-5377,
or by faxing your request to the warehouse at 301-386-5394. The policy
will also be available on the Internet at http://www.airweb.faa.gov/AC.
Issued in Kansas City, Missouri, on September 28, 2004.
Dorenda D. Baker,
Manager, Small Airplane Directorate, Aircraft Certification Service.
[FR Doc. 04-23068 Filed 10-13-04; 8:45 am]
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