The FAA is developing recommendations to protect information captured by the cockpit voice recorder (CVR) of an aircraft that has been involved in an accident or reportable incident.
The agency has issued a Safety Alert for Operators (SAFO) advising airline crews and maintenance teams to shut off power to the CVR to protect critical audio data after a reportable event. CVRs are designed with a finite amount of memory that is overwritten, unless the circuit breaker for the device is pulled.
