01204nam 2200385Ia 450 991069793550332120090115145533.0(CKB)5470000002393639(OCoLC)298452272(EXLCZ)99547000000239363920090115d1971 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierAltitude alerting devices/systems[electronic resource][Washington, D.C.] :Department of Transportation, Federal Aviation Administration,[1971]3, 3 pages digital, PDF fileAdvisory circular ;AC no. 91-22ATitle from PDF caption (viewed Jan. 15, 2009)."23 Dec 71."Cancels AC 91-22 dated 7 July 1969.AltimeterAltitudesMeasurementAeronauticsSafety measuresAltimeter.AltitudesMeasurement.AeronauticsSafety measures.GPOGPOBOOK9910697935503321Altitude alerting devices3121647UNINA