when did black boxes get installed in planes
Flight recorder The United States' first CVR rules were passed in 1964, requiring all turbine and piston aircraft with four or more engines to have CVRs by March 1, 1967.[37] As of 2008[update] it is an FAA requirement that the CVR recording duration is a minimum of two hours,[27] following the NTSB recommendation that it should be increased from its previously-mandated 30-minute duration.[38] As of 2014[update], the United States requires flight data recorders and cockpit voice recorders on aircraft that have 20 or more passenger seats, or those that have six or more passenger seats, are turbine-powered, and require two pilots.[39]