[Code of Federal Regulations] [Title 30, Volume 1] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 30CFR27.35] [Page 155] TITLE 30--MINERAL RESOURCES CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR PART 27_METHANE-MONITORING SYSTEMS--Table of Contents Subpart C_Test Requirements Sec. 27.35 Tests to determine life of critical components and subassemblies. Replaceable components may be subjected to appropriate life tests at the discretion of MSHA.