[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR33.12]

[Page 156]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 33--DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES--Table of Contents
 
                      Subpart A--General Provisions
 
Sec. 33.12  Changes after certification.

    If an applicant desires to change any feature of a certified unit or 
system, 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, 
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.
    (b) The application will be examined by MSHA to determine whether 
inspection and testing will be required. Testing will be necessary if 
there is a possibility that the modification may affect adversely the 
performance of the unit or system. MSHA will inform the applicant 
whether such testing is required and the components or materials to be 
submitted for that purpose.
    (c) If the proposed modification meets the requirements of this part 
and Part 18 of Subchapter D of this chapter (Bureau of Mines Schedule 2, 
revised, the current revision of which is Schedule 2F) if applicable, 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.

[Schedule 25B, 25 FR 6473, July 9, 1960, as amended at 52 FR 17515, May 
8, 1987]