NTSB Identification: SEA00LA194.
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Accident occurred Thursday, September 28, 2000 in BURNS, OR
Probable Cause Approval Date: 05/18/2001
Aircraft: Cessna 172K, registration: N84034
Injuries: 1 Uninjured.

NTSB investigators may have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

During a climb in turbulent conditions, the most-outboard five inches of one propeller blade separated from the aircraft. Due to the violent vibration that followed, the pilot shut the engine off and made an emergency landing in an open field. An examination at the NTSB materials laboratory determined that the blade section had separated due to a fatigue crack that had propagated through two-thirds of the chord of the blade. The origin of the fatigue crack was determined to be an area on the leading edge where the blade had been damaged by impact with a foreign object.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The separation of a portion of one propeller blade as a result of a fatigue crack that initiated at the site of foreign object damage to the blade.

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