When does the Cockpit Voice Recorder (CVR) begin recording?

The Cockpit Voice Recorder (CVR) is designed to capture all relevant audio from the cockpit environment, which includes conversations between the flight crew and sounds from both the aircraft systems and any ambient noise. It starts recording as soon as electrical power is established. This capability ensures that all critical information and conversations that may occur prior to the aircraft's movement are documented, providing vital context in the event of an incident.

This feature is essential for aviation safety, as it allows investigators to review events leading up to flights, including pre-flight checks and communications, which may inform understanding during investigations into accidents or irregularities. The recording continues until the power is lost, typically at shutdown, capturing a comprehensive timeline of the flight crew's interactions and ambient sounds throughout the entire phase of flight.