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… of airworthiness for: (1) Manned free balloons; and (2) Airships. (b) The aircraft buoyancy shall be provided by … not exceed: (a) Balloons: 2200 m 3 (77 690 ft 3 ) (b) Airships: 4300 m 3 (151 850 ft 3 ) 549.305 Number of … are not adversely affected, but shall not exceed four. (b) Airships: The number of occupants shall not exceed two. …
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