The Philadelphia air ambulance crash is a tragic incident that has raised many questions about what went wrong. According to the US National Transportation Safety Board (NTSB), the helicopter air ambulance flight was in cruise flight at an altitude of about 1,500ft mean sea level (msl) when it departed from normal cruise flight and entered a rapid spin before crashing in Philadelphia's Drexel Hill suburb ¹. The NTSB has released a preliminary report on the crash, which occurred on January 11, 2022, and owned by Air Methods ².br br The *NTSB Final Report* states that flight track data indicated the helicopter's unusual behavior while in cruise flight, but the exact cause of the crash is still under investigation. The report highlights the importance of understanding the events leading up to the crash to prevent similar incidents in the future.br br The *Key Findings* of the report include the helicopter's rapid spin and loss of control, which ultimately led to the crash. The NTSB's analysis of the flight data and other evidence will help to determine the root cause of the accident ¹.br br Overall, the Philadelphia air ambulance crash is a complex incident that requires a thorough investigation to determine what went wrong.