Accident Overview
On the day of the accident, a crew was performing calibration of the Instrument Landing System (ILS) at Pittsburgh-Greater Pittsburgh Airport. While approaching the airport from the northeast, the aircraft's engine stopped. The airplane subsequently lost height, struck trees, and crashed in Coraopolis, approximately three miles northeast of the airfield.
Sequence of Events
The flight was conducting ILS calibration procedures. As the aircraft approached from the northeast, the engine ceased operation. The loss of power caused the airplane to descend. It struck trees and impacted terrain in Coraopolis. The aircraft was destroyed in the crash.
Injuries and Damage
All three crew members on board were injured. The aircraft sustained substantial damage and was destroyed.
Probable Cause
The official investigation determined the probable cause to be engine failure caused by fuel starvation due to the left fuel selector valve poppet seal leakage.