AI reconstructs protected cockpit audio from UPS crash spectrogram
Members of the public used AI to reconstruct cockpit voice recordings from a spectrogram image released in the NTSB's public docket for the UPS flight 2976 crash investigation. The reconstructed audio was posted online, prompting the NTSB to temporarily suspend public access to all its investigation dockets.
What happened
UPS flight 2976 crashed on November 4, 2025, shortly after takeoff from Louisville, Kentucky, killing three crew members and 12 people on the ground. The left engine separated from the wing during takeoff rotation.
During a two-day NTSB investigative hearing held May 19-20, 2026, the board released a public docket including a PDF file showing a spectrogram analysis of the cockpit voice recording. Members of the public used image recognition and computational methods to reconstruct approximations of the pilots' voices from the spectrogram imagery and posted the reconstructed audio online.
Reported impact
The reconstructed audio clip, which covered the last 30 seconds of the flight, was posted online and included the pilots' final words as they struggled with the disabled aircraft, along with background noise and echoes.
The incident raised concerns about the sensitive nature of cockpit voice recordings and the unintended consequences of releasing supporting technical imagery.
Index analysis
Federal law prohibits the release of cockpit voice recordings due to the highly sensitive nature of verbal communications inside the cockpit. The NTSB statement noted that advances in image recognition and computational methods have enabled individuals to reconstruct approximations of cockpit voice recorder audio from sound spectrum imagery.
The NTSB has historically released investigation dockets for transparency but had never encountered this type of reconstruction capability before, according to an NTSB spokesperson.
Governance controls
The NTSB took the rare step of temporarily closing public access to all dockets, including the one for the UPS crash, to examine the scope of the issue and evaluate solutions. The board stated it was working to restore access to the docket system while addressing the privacy concerns.
Classification
Sources and evidence
This record was researched and written by the Index, based on the following original reporting.