A replacement part only earns its price if it stays installed. That is the standard our quality system is built around — not sampling percentages, but service life in the field.
We inspect 100% of assembled units functionally before packing, and we keep the data. When a distributor raises a technical query, we can pull the production record for that batch rather than guessing at a cause.
Field returns feed directly into engineering review. Where a failure mode points to a specification issue, the drawing changes — and the change is documented for our partners.