NTSB Identification: SEA83FYM04.
The docket is stored on NTSB microfiche number 20271.
Nonscheduled 14 CFR
Accident occurred Monday, January 24, 1983 in DUFUR, OR
Aircraft: MOONEY M20K, registration: N97429
Injuries: 1 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE AIRCRAFT COLLIDED WITH AN IRRIGATION PIPE LINE AND FENCE DURING ROLLOUT OF A FORCED LANDING AFTER ENGINE FAILURE. THE ENGINE STOPPED WHILE THE AIRCRAFT WAS CRUISING EN ROUTE. THE PILOT REMAINED IN RADIO CONTACT THROUGHOUT THE EMERGENCY AND LANDED IN A FIELD OF GRAIN STUBBLE AND NEW CROPS. AN ENGINE TEARDOWN REVEALED A HOLE IN THE #4 PISTON. THIS HOLE HAD PRESSURIZED THE CRANKCASE FORCING OIL OUT OF THE BREATHER UNTIL OIL DEPLETION CAUSED ENGINE STOPPAGE. ALSO, A TRACE OF CARBON TRACKING WAS FOUND ON THE RIGHT DISTRIBUTOR BLOCK FROM THE #4 LOCATION TO ANOTHER STATIONARY ELECTRODE.

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

IGNITION SYSTEM,MAGNETO..CONTAMINATION

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

IGNITION SYSTEM,MAGNETO..SHORTED

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

ENGINE ASSEMBLY,PISTON..OTHER


Contributing Factors

OBJECT..FENCE


Contributing Factors

OBJECT


Contributing Factors

ENGINE ASSEMBLY,PISTON..LEAK


Contributing Factors

FLUID,OIL..EXHAUSTION

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