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.