The NTSB is urging the FAA to require
25-hour CVR recorders after incidents like the one with Air Canada at SFO in 2017 where pertinent CVR data was overwritten.
The National Transportation Safety Board (NTSB) is providing the following information to urge the Federal Aviation Administration (FAA) to take action on the safety recommendations issued in this report. These recommendations address the need to install cockpit voice recorders (CVR) with a minimum 25-hour recording capability on all newly manufactured airplanes required to have a CVR and retrofit these CVRs on existing aircraft required to have flight recorders. These recommendations are derived from the NTSB’s experiences with investigations that lacked access to relevant CVR data. Information supporting these recommendations is discussed below.
https://www.ntsb.gov/investigations/...ts/ASR1804.pdf