{"data":{"id":"us/49-cfr-227.117","jurisdiction":"us","citation":"49 CFR 227.117","heading":"Hearing protector attenuation.","body":"(a) A railroad shall evaluate hearing protector attenuation for the specific noise environments in which the protector will be used. The railroad shall use one of the evaluation methods described in appendix B of this part; “Methods for Estimating the Adequacy of Hearing Protector Attenuation.”\n(b) Hearing protectors shall attenuate employee exposure to an 8-hour TWA of 90 decibels or lower, as required by § 227.115.\n(c) For employees who have experienced a standard threshold shift, hearing protectors must attenuate employee exposure to an 8-hour time-weighted average of 85 decibels or lower.\n(d) The adequacy of hearing protector attenuation shall be re-evaluated whenever employee noise exposures increase to the extent that the hearing protectors provided may no longer provide adequate attenuation. A railroad shall provide more effective hearing protectors where necessary.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","PART 227—OCCUPATIONAL SAFETY AND HEALTH IN THE LOCOMOTIVE CAB","Subpart B—Occupational Noise Exposure for Railroad Operating Employees."],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"b5fa5867b90faf97946b06069d2e3268662a3c79d61370a253c206dbda59d3bc","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-227.115","next":"us/49-cfr-227.119"},"notice":"GroundRules: Original legal text. Not legal advice."}