A group of investigators are investigating a recent airplane crash in Lucitona. The investigators discovered debris of the aircraft, which provided them the information regarding the nature of the plane crash. But because the flight data recorder (a device that preserves the recent history of the flight) of the airplane was completely destroyed in the crash, the investigators were unable to determine what exactly went wrong. The absence of the flight data recorder led the investigators to call off the investigation. It can be concluded that the investigation was called off because: