NTSB Identification: SEA94IA103.
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Scheduled 14 CFR ALASKA AIRLINES
Incident occurred Sunday, April 17, 1994 in SEATTLE, WA
Probable Cause Approval Date: 02/14/1995
Aircraft: MCDONNELL DOUGLAS MD-83, registration: N931AS
Injuries: 139 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

DURING THE LANDING/TAXI SEQUENCE, THE LEFT MAIN GEAR WHEEL HUB EXPERIENCED A FATIGUE FRACTURE. THE CRACKS WHICH LED TO THE FRACTURE ORIGINATED IN THE HUB GREASE DAM GROOVE. THE FRACTURING OF THE HUB DAMAGED OTHER BRAKE COMPENENTS, WHICH ALLOWED HYDRAULIC FLUID TO LEAK ONTO A HOT BRAKE PAD, WHERE IT WAS IGNITED.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

THE FATIGUE FRACTURE OF A MAIN GEAR WHEEL HUB.

Full narrative available

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