Sec. 25.619 - Special factors.
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 --
(b) Likely to deteriorate in service
before normal replacement; or
(c) Subject to appreciable variability
because of uncertainties in manufacturing processes or inspection methods.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-23, 35 FR 5674, Apr. 8, 1970]