30 CFR § 36.12
Changes after certification.
If an applicant desires to change any feature of certified equipment, he
shall first obtain MSHA's approval of the change, pursuant to the following
procedure:
(a) Application shall be made as for an original certificate of
approval, requesting that the existing certification be extended to cover the
proposed changes and shall be accompanied by drawings, specifications, and
related data, showing the changes in detail.
(a)(1) Application shall be made, as for an original certificate of approval, requesting that the existing certification be extended to cover the proposed change. The application shall be accompanied by specifications and related material as in the case
of an original application.
(2) Where the applicant for approval has used an independent laboratory under part 6 of this chapter to perform, in whole or in part, the necessary testing and evaluation for approval of changes to an approved product under this part, the applicant must provide to MSHA as part of the approval application:
(i) Written evidence of the laboratory's independence and current recognition by a laboratory accrediting organization;
(ii) Complete technical explanation of how the product complies with each requirement in the applicable MSHA product approval requirements;
(iii) Identification of components or features of the product that are critical to the safety of the product; and
(iv) All documentation, including drawings and specifications, as submitted to the independent laboratory by the applicant and as required by this part.
(b) The application will be examined by MSHA to determine whether
inspection and testing of the modified equipment or component or subassembly
will be required. Testing will be necessary if there is a possibility that
the modification may affect adversely the performance of the equipment. MSHA
will inform the applicant whether such testing is required and the component,
subassembly, and related material to be submitted for that purpose.
(c) If the proposed modification meets the requirements of this part,
a formal extension of certification will be issued, accompanied by a list of
new and corrected drawings and specifications to be added to those already on
file as the basis for the extension of certification.