US 427
8 Sep 1994 · System & Design MalfunctionUSAIR FLIGHT 427
Boeing 737-300 · USAir · Image: Wikimedia Commons
Why it happened
Same hidden rudder defect as United 585
Rudder PCU thermal shock
Lateral control
Wake turbulence trigger
Aircraft
Boeing 737-300
USAir
Route
Chicago–O'Hare (ORD), USA
→ Pittsburgh (PIT), USA
People
132 on board
132 fatalities
Date
8 Sep 1994
Flight crew
Captain: Peter Germano
Category
System & Design Malfunction
When software, sensors and design turn on the crew.
THE STORY
The 737 flipped and dove 6,000 ft in 28 seconds on approach to Pittsburgh. Solving it took the NTSB's longest investigation in history.