<>in 1971 the CVR's had rather limited capability and probably overwrote the previous recordings about ever 30 or 45 minutes.
MSgt Wally Johnson, one of the two loadmasters on the sled test flight of 01.06.1972, indicated in his interview with the WSHS that aircraft N467US had a flight data recorder but no cockpit voice recorder:
WJ: "Jet aircraft are basically… all of them… work quite similar, you know, although the 727 that he skyjacked only had one black box. Now days they all have two, they have a voice and they have a mechanical."
WSHS: "Do you mind describing for us how the black box worked on that 727?"
WJ: "Yeah, it is all connected into the mechanical system. Everything is built in sections you know, one for environmental, the altimeters, stuff like that. The other one is how the engines operate and then they also have… sections of the dash one which covers the safety of the aircraft and that "
Source: Washington State Historical Society, document 2013.5.21.2, You are not allowed to view links.
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