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Application	Tilt tray sorter chain used in the baggage handing area of a major airport.
Failure mode	Chain pins and bi-planar block show scoring and heavy red deposit indicating fretting corrosion.
Diagnosis	Fretting corrosion caused by marginal lubrication, where the lubricant present is insufficient to prevent the asperities on each component rubbing together.
Solution	Every pin should be removed and all traces of abrasive red oxide removed. The chain should then be operated in an improved lubrication engine.