Accident Grumman American AA-5A Cheetah N26250, Sunday 23 August 1987

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Date:	Sunday 23 August 1987
Time:	08:10 LT
Type:	Grumman American AA-5A Cheetah
Owner/operator:	Private
Registration:	N26250
MSN:	AA5A-0484
Total airframe hrs:	2300 hours
Engine model:	Lycoming O-320-E2G
Fatalities:	Fatalities: 0 / Occupants: 2
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Tucson, AZ - United States of America
Phase:	Initial climb
Nature:	Private
Departure airport:	(KTUS)
Destination airport:	Scottsdale, AZ (KSDL)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE PLT REPORTED THAT JUST AFTER TAKEOFF, THE ENGINE LOST PARTIAL POWER & HE WAS UNABLE TO LAND BACK AT THE AIRPORT. DURING AN EMERGENCY LANDING, THE AIRCRAFT COLLIDED WITH A UTILITY LINE & POLE. AN EXAM OF THE ENGINE REVEALED THAT A ROCKER ARM ON THE #4 CYLINDER HAD FAILED. A METALLURGICAL EXAM OF THE PART SHOWED IT HAD FAILED FROM HIGH CYCLE FATIGUE.

Probable Cause:

Accident investigation: