OGDEN, UT, USA
N6203A
CESSNA P210R
THE TWO PLTS HAD DEPARTED ON A FLT TO GET TWO REVENUE PASSENGERS. THE LEFT SEAT PLT WAS AT THE CTLS WHEN A LOSS OF ENG POWER OCCURRED. HE MADE A 180 DEG TURN & WAS GLIDING DOWN A CANYON WHEN IT STRUCK AN UNMARKED POWER LINE AT THE MOUTH OF THE CANYON. IMPACT OCCURRED ABOUT 100 TO 200 FT AGL. A POST-ACDNT EXAM OF THE ENG REVEALED EVIDENCE OF DETONATION/PREIGNITION & EXCESSIVE HEATING IN THE #1 CLYINDER & SUBSEQUENT FAILURE OF THE #1 PISTON.
FAILURE OF THE #1 PISTON DUE TO PRE-IGNITION/DETONATION IN THE #1 CYLINDER, AND INADEQUATE VISUAL LOOKOUT BY THE PILOT (HIS FAILURE TO SEE-AND-AVOID THE OBSTRUCTION). THE OBSTRUCTION (POWER LINE) WAS A RELATED FACTOR.
Source: NTSB Aviation Accident Database
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