Special factors.

§ 29.619 Special factors. (a) The special factors prescribed in §§ 29.621 through 29.625 apply to each part of the structure whose strength is— (1) Uncertain; (2) Likely to deteriorate in service before normal replacement; or (3) Subject to appreciable variability due to— (i) Uncertainties in manufacturing processes; or (ii) Uncertainties in inspection methods. (b) For each part of the rotorcraft to which §§ 29.621 through 29.625 apply, the factor of safety prescribed in § 29.303 must be multiplied by a special factor equal to— (1) The applicable special factors prescribed in §§ 29.621 through 29.625; or (2) Any other factor great enough to ensure that the probability of the part being understrength because of the uncertainties specified in paragraph (a) of this section is extremely remote.