NTSB Identification: CHI83LA252.
The docket is stored on NTSB microfiche number 21578.
Accident occurred Sunday, June 12, 1983 in BLACKDUCK, MN
Aircraft: PIPER PA-12, registration: N2487M
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE ACFT MADE A HARD LANDING IN AN ALFALFA FIELD AFTER LOSS OF ENGINE POWER. DURING AN ENROUTE PORTION OF THIS FLT THE PILOT STATED THAT OIL CONSUMPTION WAS EXCESSIVE. HE PLANNED AN INTERMEDIATE STOP FOR THAT REASON. BEFORE REACHING THE INTERMEDIATE STOP THE ENGINE 'FROZE'. NO OIL WAS FOUND IN THE ENGINE. THE LOWER FUSELAGE WAS COATED WITH OIL WHICH HAD GONE OUT THROUGH THE BREATHER. THE #2 PISTON ROD HAD FAILED. COMPRESSION ON #1,3 AND 4 CYLINDERS WAS LOW.

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

ENGINE ASSEMBLY,CYLINDER..LOW COMPRESSION

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

MAINTENANCE..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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

FLUID,OIL..EXHAUSTION

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

IN-FLIGHT PLANNING/DECISION..IMPROPER..PILOT IN COMMAND

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

ENGINE ASSEMBLY,PUSH ROD..FAILURE,TOTAL

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