Philadelphia plane crash: NTSB says flight's black box never recorded audio
The plane's crew was in communication with the air traffic control tower at the time of the accident, and no distress calls were made prior to the crash. The plane's black box also did not record audio of the crash.
https://justthenews.com/politics-policy/transportation/philadelphia-plane-crash-ntsb-says-flights-black-box-never-recorded