(a) All products submitted for approval under this part shall be
tested using the test procedures specified in the appropriate subpart unless
MSHA determines, upon review of the documentation submitted, that testing is
not required. Applicants shall maintain records of test results and
procedures for three years.
(b) Unless otherwise specified in the subpart, test instruments shall
be calibrated at least as frequently as, and according to, the instrument
manufacturer's specifications, using calibration standards traceable to those
set by the National Bureau of Standards, U.S. Department of Commerce or other
nationally recoginzed standards and accurate to at least one significant
figure beyond the desired accuracy.
(c) When MSHA elects to observe product testing, the applicant shall
permit an MSHA official to be present at a mutually agreeable date, time,
(d) MSHA will accept product testing conducted outside the United
States where such acceptance is specifically required by international
[53 FR 23500, June 22, 1988; 53 FR 25569, July 7, 1988; 60 FR 33719, June 29,