NTSB Identification: DEN87LA241.
The docket is stored on NTSB microfiche number 34110.
Accident occurred Wednesday, September 16, 1987 in SPANISH FORK, UT
Probable Cause Approval Date: 08/02/1988
Aircraft: CESSNA TU206G, registration: N756HD
Injuries: 1 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.

WHILE CRUISING AT 10,500 FT WITH THE POWER SET AT 28 INCHES MAP & 2350 RPM, THE ENG SUDDENLY LOST PWR & BEGAN KNOCKING. THE PLT NOTED A RAPID DROP IN OIL PRESSURE & SAW A 3-INCH HOLE IN THE TOP OF THE ENG COWLING. HE ATTEMPTED TO LAND ON A HIGHWAY, BUT WAS UNABLE DUE TO VEHICULAR TRAFFIC, SO HE CHANGED HIS APCH TO LAND BESIDE THE ROADWAY. JUST BFR LANDING, HE SAW POWERLINES & PULLED UP TO AVOID A COLLISION. THE ACFT THEN ENTERED A HIGH SINK RATE (STALLED). THE PILOT STATED THE ACFT 'IMPACTED THE GROUND IN A FLAT, RATHER NOSE LOW ATTITUDE.' THE ACFT BEGAN BURNING IMMEDIATELY AFTER IMPACT, BUT THE PLT EXITED THE PLANE WITHOUT INJURY. A TEARDOWN OF THE ENG REVEALED A CATASTROPHIC FAILURE OF THE #2 PISTON AND WRIST PIN, BUT THE INVESTIGATION DID NOT DETERMINE WHICH HAD FAILED 1ST. THE ENGINE HAD BEEN OVERHAULED ON 6/5/84, USINGSEVERAL COMPONENTS (INCLUDING PISTONS & PISTON PINS) MANUFACTURED BY SUPERIOR AIR PARTS, INC. ACCORDING TO MAINTENANCE LOGS, THE ACFT HAD FLOWN 1045 HRS SINCE MAJOR OVERHAUL OF THE ENG.

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

ENGINE ASSEMBLY,PISTON..FAILURE,TOTAL


Contributing Factors

TERRAIN CONDITION..NONE SUITABLE


Contributing Factors

OBJECT..VEHICLE


Contributing Factors

OBJECT..WIRE,TRANSMISSION



Index for Sep1987 | Index of months