Accident Thorp T-18 N64628, Monday 20 June 1994

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Date:	Monday 20 June 1994
Time:	16:04 LT
Type:	Thorp T-18
Owner/operator:	Private
Registration:	N64628
MSN:	825
Total airframe hrs:	279 hours
Engine model:	Lycoming O-320
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	East Quogue, NY - United States of America
Phase:	En route
Nature:	Private
Departure airport:
Destination airport:	Westhampton Bch, NY
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
The airplane was being flown for the first time in about 4 years when the engine lost power during a local flight at an altitude of 4500 feet msl. The pilot did a forced landing on a the side of a highway and the airplane nosed over during the landing. Examination of the airplane revealed the number four cylinder spark plugs were oil fouled. The engine had been overhauled about a month before the accident.

Probable Cause: Inadequate maintenance which resulted in oil-fouled spark plugs and the loss of engine power.

Accident investigation: