Prinair Flight 191 - Investigation

Investigation

The National Transportation Safety Board (NTSB) investigation concluded that the probable cause was the "presence of an unauthorized vehicle on the runway which caused the pilot to attempt a go-around after touchdown to avoid a collision. The maneuver resulted in an overrotation of the aircraft at too low an airspeed to sustain flight". This was based on eyewitness accounts of a set of lights visible on the runway as Flight 191 approached, and other eyewitness accounts of a vehicle owned by the Puerto Rico Ports Authority being parked shortly after the accident and the driver acting in a suspicious manner.

Three years after the accident the NTSB was compelled to re-open the investigation into the crash, after submissions were received that the person who was suspected of driving the "unauthorized vehicle" had actually left the airport about fifteen minutes before the aircraft crashed. The second investigation concluded that there was no airport vehicle on the runway, and that the reason for the go-around of the aircraft was unknown; a new report was issued, explaining the evidence as to the location of the airport vehicle and amending the Probable Cause to remove reference to a vehicle being on the runway.