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… Part 31 entitled Airworthiness Standards, Manned Free Balloons. These United States airworthiness standards … Register dated 24 May, 1996: * Amendment 31-7 "Manned Free Balloon Burner Testing" amends the burner test … 29 - Transport Category Rotorcraft Subpart 31 - Manned Free Balloons Subpart 33 - Aircraft Engines Subpart 35 - …
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