NTSB Identification: ERA11CA355
Nonscheduled 14 CFR Part 91: General Aviation
Accident occurred Monday, June 20, 2011 in Carthage, NC
Probable Cause Approval Date: 12/27/2011
Aircraft: DOTSON WILLIAM P SNGL SEAT HAWK ARROW, registration: N4209F
Injuries: 1 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

According to the pilot, during the turn from the base leg to final approach, the engine experienced a partial loss of power. He performed a forced landing into some small trees because he knew he could not glide the airplane to the runway. The airplane sustained substantial damage to the wing spars. A postaccident examination revealed that a spark plug was backed out of the No. 1 cylinder and was suspended from the electrode wire. The pilot reported that he had changed the engine spark plugs the day before the accident and that he may have cross-threaded one of them.

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

A partial loss of engine power due to the pilot’s improper installation of the engine’s No. 1 cylinder spark plugs.

Full narrative available

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