NTSB Identification: CEN09IA172
14 CFR Part 91: General Aviation
Incident occurred Tuesday, February 17, 2009 in Grayslake, IL
Probable Cause Approval Date: 08/13/2009
Aircraft: CESSNA 150, registration: N747KA
Injuries: 2 Uninjured.

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

The pilot rented the airplane for a local flight with the passenger. While maneuvering, the airplane experienced a partial loss of engine power and the pilot could not maintain altitude. The pilot elected to perform a precautionary landing to a frozen lake and landed uneventfully. Examination of the engine revealed that the Number 1 cylinder intake valve had fractured. The cause of the failure could not be determined. The operator exceeded the engine manufacturer's recommended time between overhaul by over 1,600 hours. However, because the operator operated under Part 91, they were not subject to the Federal regulations that require compliance with manufacturers' recommended maintenance instructions.

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

The failure of the number 1 cylinder intake valve which resulted in a partial loss of engine power. Contributing to the incident was the failure of the operator to maintain the engine per manufacturer's recommendations.

Full narrative available

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