§ 31.12 - Proof of compliance.

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Each requirement of this subpart must be met at each weight within the range of loading conditions for which certification is requested. This must be shown by—

Tests upon a balloon of the type for which certification is requested or by calculations based on, and equal in accuracy to, the results of testing; and

Systematic investigation of each weight if compliance cannot be reasonably inferred from the weights investigated.

Except as provided in § 31.17(b), allowable weight tolerances during flight testing are + 5 percent and −10 percent.