"8/16/99." Title from PDF file caption (viewed Oct. 22, 2008).
Technical Details:
Mode of access: Internet at the FAA web site. Address as of 10/22/08: http://www.airweb.faa.gov/Regulatory%5Fand%5FGuidance%5FLibrary/rgAdvisoryCircular.nsf/0/e7bb4071cf25339a862569af00762817/$FILE/AC20-140.pdf; current access available via PURL.