NTSB Identification: MKC85FA182.
The docket is stored on NTSB microfiche number 28503.
Accident occurred Monday, August 12, 1985 in ST. CHARLES, MO
Aircraft: RONALD HOUK RD-1, registration: N4741A
Injuries: 1 Fatal.

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 HOME BUILT GYROCOPTER WAS BEING FLOWN BY THE OWNER/BUILDER/DESIGNER WHO HAD AN AIRPLANE, SINGLE-ENG, LAND RATING. SHORTLY AFTER THE GYROCOPTER TOOK OFF, THE ENG WAS OPERATING AT A HIGH RPM WHEN A WITNESS HEARD A POP/NOISE. SUBSEQUENTLY, THE GYROCOPTER CRASHED IN A CORN FIELD ABOUT 1-1/2 MI FROM THE DEPARTURE POINT. THE MAIN WRECKAGE WAS FOUND INVERTED. ONE ROTOR BLADE, THE OIL COOLER & THE LEFT VERTICAL STABILIZER & RUDDER WERE FOUND 60 TO 150 FT FROM THE MAIN WRECKAGE. BOTH OF THE WOODEN PROP BLADES HAD SHATTERED. THE OIL COOLER HAD BEEN INSTALLED BELOW THE ENG & JUST FORWARD OF THE PROP. ITS UPPER SIDE HAD BEEN ATTACHED WITH A SINGLE SOLID MOUNT USING AN 'L' SHAPED ALUMINUM STRAP. ITS LOWER SIDE WAS FASTENED WITH A SEMIFLEXIBLE MOUNTING. THERE WAS EVIDENCE THAT THE UPPER MOUNT HAD FAILED & ALLOWED THE OIL COOLER TO MOVE AFT INTO THE PLANE OF ROTATION OF THE PROP BLADES. EXCEPT FOR THE OIL COOLER BRACKET, NO PRE- ACCIDENT MECHANICAL PROBLEMS WERE FOUND.

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

LUBRICATING SYSTEM..FAILURE,PARTIAL





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