The US National Transportation Safety Board released a spectrographic image derived from cockpit audio from a UPS crash in Louisville, Kentucky. The image captured the last words of two pilots before the plane crashed. Technically skilled individuals converted the spectrogram back into approximate audio and shared it online. The NTSB acknowledged that advances in image processing and computation can allow graphs to be turned back into approximate audio. The NTSB stated federal law prohibits such public release because cockpit verbal communications are highly sensitive and that privacy restrictions are taken seriously. The spectrogram release occurred alongside an investigative hearing into a November 4, 2025 UPS MD-11F cargo flight that killed three crew members and 12 people on the ground, with 23 others injured.
"NTSB doesn't release cockpit voice recorders from crashes, except in this case they've released an image of a spectrogram. I'm not sure that's a good idea since you can probably reconstruct a lot of audio from the megabytes of data encoded in this image."
"Federal law prohibits such public release due to the highly sensitive nature of verbal communications inside the cockpit. The NTSB takes these privacy restrictions seriously."
"Technically savvy individuals promptly turned the soundwave graph back into audio and posted it on the internet, prompting the NTSB to acknowledge it is now aware that advances in image processing and computation allow graphs to be turned back into approximate audio."
"The spectrogram was released on May 19, 2026, in conjunction with the NTSB investigative hearing into the November 4, 2025 crash of a United Parcel Service MD-11F cargo plane (flight 2976), which occurred shortly after takeoff from Louisville Muhammad Ali International Airport."
#aviation-safety #cockpit-voice-recordings #spectrogram-audio-reconstruction #privacy-and-federal-law #image-processing
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