01506nam 2200373Ia 450 991069762640332120081020144919.0(CKB)5470000002390701(OCoLC)262844941(EXLCZ)99547000000239070120081020d1993 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierAirworthiness approval of traffic alert and collision avoidance systems (TCAS II) and Mode S transponders[electronic resource][Washington, D.C.] :U.S. Dept. of Transportation, Federal Aviation Administration,[1993]1 volume (various pagings) digital, PDF fileAdvisory circular ;AC no. 20-131A"3/29/93."AC 20-131, dated October 3, 1988, is cancelled.Title from title screen (viewed Oct. 20, 2008).Airworthiness approval of traffic alert and collision avoidance systems AirplanesCollision avoidanceAir traffic controlElectronic equipmentCertificationUnited StatesAirplanesCollision avoidance.Air traffic controlElectronic equipmentCertificationGPOGPOBOOK9910697626403321Airworthiness approval of traffic alert and collision avoidance systems (TCAS II) and Mode S transponders3133595UNINA