Read the article: > Davis specifically alleged that four seconds were missing from the final moments of the flight — enough to put the engine response outside

Read the article: > Davis specifically alleged that four seconds were missing from the final moments of the flight — enough to put the engine response outside the certification requirements. His main evidence was an apparent disagreement between the time stamps on the ATC transcript and the flight data recorder. The FDR had a “radio transmit” parameter, which showed up in the data four seconds after the final air traffic control transmission. But this was actually a really basic misunderstanding of how the FDR works: the “radio transmit” parameter is only recorded when one of the pilots makes an outgoing transmission, not when an incoming transmission is received. The data point corresponded to Mazières’ reply to the transmission, not the transmission itself, and matched up perfectly with the official timeline.