ED Decision 2009/005/R
(a) The suitability and durability of materials used for parts, the failure of which could adversely affect safety, must
(1) be established by experience or tests; and
(2) meet approved specifications that ensure their having the strength and other properties assumed in the design data. (See AMC 31HB.33(a)(2))
(b) Envelope materials must be shown not to support continued burning if ignited by the heater when the balloon is inflated or in flight.
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