Accident Waco RNF N11270, Saturday 6 October 1990

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Date:	Saturday 6 October 1990
Time:	11:05 LT
Type:	Waco RNF
Owner/operator:	Private
Registration:	N11270
MSN:	3467
Total airframe hrs:	2751 hours
Engine model:	WARNER SS50
Fatalities:	Fatalities: 0 / Occupants: 2
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Lampasas, TX - United States of America
Phase:	Initial climb
Nature:	Private
Departure airport:	(T28)
Destination airport:	(NONE)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE ENGINE LOST PARTIAL POWER AS THE PILOT TURNED CROSSWIND AFTER TAKEOFF, FOLLOWED B A COMPLETE POWER LOSS DURING THE TURN TO DOWNWIND. THE PILOT SET UP FOR A FORCED LANDING TO THE BEST AVAILABLE FIELD WHICH WAS COVERED WITH BRUSH AND TREES. JUST PRIOR TO TOUCHDOWN, THE ENGINE HAD A MOMENTARY SURGE OF POWER AND THEN QUIT AGAIN. DURING THE LANDING ROLL, THE LEFT MAIN LANDING GEAR COLLAPSED AND THE AIRPLANE NOSED OVER. INVESTIGATION REVEALED THAT THE NO. 6 CYLINDER INTAKE VALVE SPRING WAS BROKEN AND THE CYLINDER WAS RUNNING COLD. ADDITIONALLY, PARTICULATE CONTAMINATION WAS FOUND IN THE FUEL SYSTEM.

Probable Cause: THE FAILURE OF A CYLINDER INTAKE VALVE SPRING.

Accident investigation: