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This rulemaking would increase the recording time of cockpit voice recorders (CVRs) from the currently mandated 2-hour loop to a proposed 25-hour loop for all future manufactured aircraft. This action is responsive to the National Transportation Safety Board’s (NTSB) Safety Recommendation A-18-030, which recommended the installation of CVRs with a 25-hour minimum recording capability on all newly manufactured airplanes required to have a CVR. This rulemaking effort will ensure harmonization with existing international requirements such as, International Civil Aviation Organization (ICAO), European Union Aviation Safety Agency (EASA), and other civil aviation authorities (CAAs). The intended effect of this action is to provide accident investigators, operators, and CAAs with substantially more CVR data to prevent future incidents and accidents.