Incident Overview
A regularly scheduled passenger commuter flight en route from Seattle to Bellingham, Washington, encountered a burn-through of the left engine's number 3 exhaust riser. While in flight, the pilot visually detected a discoloration on the left engine nacelle. Despite this observation, the pilot was unable to execute a precautionary landing before the burn-through extended to the engine cowl.
Landing
The flight crew subsequently accomplished an uneventful landing at Everett, Washington. No anomalies were reported during the landing phase.
Component Maintenance History
The affected exhaust riser component had accumulated approximately 4,000 hours of operation since its last overhaul. It also had approximately 70 hours of service since the most recent 100-hour inspection.