Noise abatement for helicopters.

Bibliographic Details
Corporate Author:	United States. Federal Aviation Administration
Format:	Government Document eBook
Language:	English
Published:	[Washington, D.C.] : U.S. Dept. of Transportation, Federal Aviation Administration, [1987]
Series:	Advisory circular ; AC no. 91-66
Subjects:	Helicopters > Noise > Control. Helicopters > Noise > Safety measures.
Online Access:	https://purl.fdlp.gov/GPO/LPS108010

Description
Item Description:	Title from PDF caption (viewed Jan. 26, 2009). "6/4/87." Electronic resource.
Physical Description:	8 pages : digital, PDF file.
Format:	Mode of access: Internet at the FAA web site. Address as of 1/26/09: http://www.airweb.faa.gov/Regulatory%5Fand%5FGuidance%5FLibrary/rgAdvisoryCircular.nsf/0/d75c8436206fab2b862569ea00695b4c/$FILE/ATTAU91G/ac91-66.pdf ; current access available via PURL.