NTSB Identification: CEN13IA387
14 CFR Part 91: General Aviation
Incident occurred Friday, June 28, 2013 in Paragould, AR
Aircraft: MARTIN CHARLES A ZENITH STOL CH 750, registration: N699TX
Injuries: 1 Uninjured.

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

On June 28, 2013, about 1100 central daylight time, an experimental, amateur-built Martin Zenith STOL CH 750, N699TX, sustained minor damage when the propeller assembly separated from the engine crankshaft during climb out after takeoff. The pilot executed a forced landing to a field with no further damage to the airplane. He was not injured. The airplane was registered to and operated by private individuals under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, which was not operated on a flight plan. The flight originated from the Kirk Field Airport (PGR), Paragould, Arkansas, about 1050. The ultimate destination was the Grosse Ile Municipal Airport (ONZ), Detroit/Grosse Ile, Michigan.

The pilot reported that during the climb out after takeoff, about 5 miles northeast of the airport, the engine “developed an immediate and heavy vibration.” He altered course to return to the airport. The intensity of the vibration increased and the pilot was considering shutting the engine down when the vibration abruptly ceased. Looking out the windshield, he observed that the propeller had separated from the airplane. The pilot subsequently executed a forced landing to a field with no additional damage to the airplane.

The propeller and propeller bolts were recovered. An examination of the fractured propeller bolts is pending.

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