Boeing 737-300 crash, Sep 8, 1994 (132 killed), Aliquippa
Boeing 737-300 accident on September 8, 1994 near Aliquippa, Pennsylvania, United States with 132 fatalities. Cause: Loss of control after the rudder...
- Date: September 8, 1994
- Aircraft: Boeing 737-300
- Location: Aliquippa, Pennsylvania, United States
- Fatalities: 132
- Phase of flight: Approach and landing
- Cause: Loss of control after the rudder moved to its blowdown limit, most likely from a jammed rudder power control unit servo valve, per the NTSB.
USAir Flight 427, a Boeing 737-300 from Chicago to Pittsburgh, went into an uncontrolled descent while maneuvering to land and crashed near Aliquippa, Pennsylvania, about six miles from the airport. All 132 people on board died and the aircraft was destroyed by impact and fire. The NTSB concluded the rudder deflected opposite to the pilots' commands after a jam in the rudder power control unit servo valve, though Boeing disputed that conclusion.