§ 24.9 - Future changes in design.

All approvals are granted with the understanding that the manufacturer will make each blasting unit according to the drawings that were submitted to MSHA and that have been included in the approval. Changes in the design shall not be made without first obtaining MSHA's authorization, procedure for which is as follows:

(a) The manufacturer shall write to Approval and Certification Center, Box 201B Industrial Park Road, Dallas Pike, Triadelphia, W. Va. 26059 requesting an extension of his original approval and stating the change or changes desired. A copy of the letter, a revised drawing of the change in detail, and one of each of the parts affected shall be sent by the manufacturer to Approval and Testing, Pittsburgh Technical Support Center, 4800 Forbes Avenue, Pittsburgh, Pa. 15213.

(b) MSHA will consider the application and inspect the drawings and parts to determine whether it will be necessary to make any tests.

(c) If MSHA finds the change to be acceptable without test, extension of approval authorizing the change will be granted in writing from MSHA.

(d) If tests are judged necessary, the applicant will be advised of the material that will be required. When the changed design has been found to comply with the requirements of this schedule, extension of approval authorizing the changes will be granted.