STINSON 108 near Bayport, NY — 2010-01-09

Probable cause

A total loss of engine power during cruise flight due to fuel contamination.

NTSB narrative

The private pilot stated that during cruise flight at approximately 600 feet, the engine began to run rough. He applied the carburetor heat and the engine cleared up briefly, before losing power again. The pilot subsequently made a forced landing on a shoreline and the airplane came to rest inverted. Examination of the engine revealed that when the main fuel gascolator was removed, debris was discovered in the bottom of the bowl. The filter was removed and also contained debris. The examination did not reveal any preimpact mechanical malfunctions. Additionally, the engine was not susceptible to carburetor icing, given the temperature and dew point at the time of the accident.

Analysis

Primary failure mode

Engine power loss

First missed decision gate

Pilot could have maintained carburetor heat after initial roughness.

NTSB coding

• Fuel contamination · Enroute-cruise

Evidence available

• 3 docket documents

Docket documents3

• Other Pertinent Forms and Reports-Mechanic Inspection Notesform
• Other Pertinent Forms and Reports-Record of Conversationform
• Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1form

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