Accident Maule M-5 N6220M, Sunday 10 December 1989

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Date:	Sunday 10 December 1989
Time:	16:00 LT
Type:	Maule M-5
Owner/operator:	Private
Registration:	N6220M
MSN:	7195C
Total airframe hrs:	1150 hours
Engine model:	Lycoming O-540-J1A5D
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Becky Lake, AK - United States of America
Phase:	Take off
Nature:	Private
Departure airport:
Destination airport:	Nenana, AK (ENN)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
SKI FORWARD ATTACHED FITTING (MAULE P/N 9027B) FOR LEFT SKI SAFETY & RIGGING CABLES FAILED IN FATIGUE. DURING SKI INSTALLATION IN 1985, ONE OF THE FITTINGS WAS MISSING & HAD TO BE FABRICATED LOCALLY. TESTS INDICATED FITTING MADE FROM WRONG STEEL.

Probable Cause: FATIGUE FAILURE OF THE SKI ATTACH FITTING DUE TO BEING FABRICATED LOCALLY FROM THE WRONG STEEL WHICH RESULTED IN THE AIRPLANE NOSING OVER.

Accident investigation: