- Medical plane’s voice recorder likely wasn’t working for years before Philadelphia crash The Associated Press
- Cockpit voice recorder from deadly Philly plane crash never recorded audio: NTSB NBC Philadelphia
- Medical Plane That Crashed in Philadelphia Lacked Cockpit Recorder The New York Times
- Black box of ambulance jet that crashed in Philly wasn’t recording audio, likely hadn’t worked for years: NTSB Fox News
- Cockpit recorder wasn’t working on medevac flight that crashed in Philadelphia — and likely hadn’t for years: NTSB New York Post
Medical plane’s voice recorder likely wasn’t working for years before Philadelphia crash – The Associated Press
