MSHA - Code of Federal Regulations - 30 CFR 27.9
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MSHA - Title 30 CFR
30 CFR § 27.9
Date for conducting tests.

The application, payment of necessary fees, and submission of required material will determine the order of precedence for testing when more than one application is pending. The date of receipt of an application will determine the order of precedence for investigation and testing. The applicant will be notified of the date on which tests will begin.
Note: If an assembly, subassembly, or component fails to meet any of the requirements, testing of it may be suspended and other items may be tested. However, if the cause of failure is corrected, testing will be resumed after completing such other test work as may be in progress.