Accident Cessna 170B N4457B, Wednesday 31 August 1994

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Date:	Wednesday 31 August 1994
Time:	13:10 LT
Type:	Cessna 170B
Owner/operator:	Private
Registration:	N4457B
MSN:	26801
Year of manufacture:	1956
Total airframe hrs:	5881 hours
Engine model:	Lycoming O-360-A1A
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Fort Yukon, AK - United States of America
Phase:	Landing
Nature:	Executive
Departure airport:	Field Site, AK
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE PILOT LANDED ON THE AIRSTRIP AND DURING THE ROLL OUT THE RIGHT MAIN LANDING GEAR COLLAPSED. EXAMINATION SHOWED A FATIGUED AREA NEAR THE CENTER OF ONE OF THE AXLE'S UPPER MOUNTING BOLT HOLES. THE AIRPLANE HAS BEEN USED ON SKIS DURING THE WINTER MONTHS. THIS FLIGHT WAS ASSOCIATED WITH A HUNT/GUIDE OPERATION. NO PASSENGERS WERE ON BOARD.

Probable Cause: THE FATIGUE FAILURE OF THE RIGHT MAIN LANDING GEAR SPRING.

Accident investigation: