WOODBURN, OR, USA
N9263U
CESSNA C-150M
THE STUDENT PILOT OF THE CESSNA 150 ELECTED TO MAKE AN EMERGENCY LANDING IN AN OPEN FIELD, WHEN SHE LOST PARTIAL POWER, AND EXPERIENCED SEVERE VIBRATIONS. AFTER TOUCHDOWN ON THE ROUGH TERRAIN, THE NOSE GEAR COLLAPSED AND THE AIRCRAFT NOSED OVER. LATER INVESTIGATION REVEALED THAT AN EXHAUST VALVE WAS SEIZED IN ITS GUIDE, AND WAS STUCK IN THE OPEN POSITION.
A SEIZED ENGINE EXHAUST VALVE. FACTORS INCLUDE ROUGH TERRAIN AND A COLLAPSED NOSE GEAR.
Source: NTSB Aviation Accident Database
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