§ 25.619 - Special factors.

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The factor of safety prescribed in § 25.303 must be multiplied by the highest pertinent special factor of safety prescribed in §§ 25.621 through 25.625 for each part of the structure whose strength is—

Uncertain;

Likely to deteriorate in service before normal replacement; or

Subject to appreciable variability because of uncertainties in manufacturing processes or inspection methods.