Title from PDF caption (viewed Mar. 6, 2009). "11/9/70."
Electronic reproduction. [Washington, D.C.] : Dept. of Transportation, Federal Aviation Administration,  Mode of access: World Wide Web. System requirements: PDF reader.
Mode of access: Internet at the FAA web site. Address as of 3/6/09: http://www.airweb.faa.gov/Regulatory%5Fand%5FGuidance%5FLibrary/rgAdvisoryCircular.nsf/0/884916178b3fd74e862569bc0057d28c/$FILE/ac121-16.pdf; current access available via PURL.