ABSTRACT
The most common recorder used in the aviation industry is the cockpit voice recorder (CVR). Although different airlines and installation facilities will refer to these two units by different names or acronyms such as digital voice recorder (DVR) and digital voice data recorder (DVDR), CVR is the most common references and is recognizable industry-wide. Technical standard orders-(TSO) C123a was released in August 1996. This TSO did not have its own associated minimum performance standards. It referenced EUROCAE document ED-56A “Minimum Operational Performance requirements for Cockpit Voice Recorder Systems”. The CVR inspection requirements are also slightly different than The International Civil Aviation Organization procedures in the Canadian Aviation Regulations—General Operating and Flight Rules, Standard 625 Appendix C—Out of Phase Tasks and Equipment Maintenance Requirements. New digital technologies interface with onboard aircraft systems and have rendered the first magnetic tape CVRs obsolete.
