00676nam a22002172 4500 hsl001007653 DGPO 20170826152603.0 170119s1991 dcu r f000 0 eng d GPO GPO MvI TD 4.8/5:27-1/991 TD 4.8/5:27-1/991 Certification of normal category rotorcraft. [Washington, D.C., 1991]. v. ADVISORY CIRCULAR. Consolidated reprint with changes 1 and 2 as of November 1, 1991. CRDP Program Historic Shelflist record. Rotors (Helicopters) United States. Federal Aviation Administration. BEV Fed Docs 264849 264849