Accident Glasair II RG N306AT, Tuesday 18 June 1991

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Date:	Tuesday 18 June 1991
Time:	13:40 LT
Type:	Glasair II RG
Owner/operator:	Private
Registration:	N306AT
MSN:	306
Engine model:	Lycoming IO-360-A1B
Fatalities:	Fatalities: 0 / Occupants: 2
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Visalia, CA - United States of America
Phase:	En route
Nature:	Private
Departure airport:	Fallbrook, CA (L18)
Destination airport:	Lake Tahoe, CA (KTVL)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE CERTIFICATED PRIVATE PILOT/OWNER STATED THAT AN HOUR AND HALF INTO THE FLIGHT THE ENGINE STARTED TO RUN ROUGH AND LOST RPM. ALL INSTRUMENTS WERE IN THE GREEN. HE HEADED THE AIRCRAFT FOR A SUITABLE AIRPORT BUT THE ENGINE QUIT IN THE PATTERN. DUE TO WINDS HE WAS UNABLE TO MAKE THE RUNWAY. EXAMINATION OF THE ENGINE BY FAA INSPECTORS REVEALED THAT THE NUMBER 4 CYLINDER EXHAUST VALVE FAILED.

Probable Cause: TOTAL LOSS OF ENGINE POWER DUE TO THE FAILURE OF THE NUMBER 4 ENGINE EXHAUST VALVE.

Accident investigation: