Acceptance Number
Meaning ~ Metric defining the maximum nonconforming units allowed in a sample set to permit shipment of a production lot under trade quality agreements.
Deviation Waiver
Meaning
Engineering concession documents formalize a buyer’s temporary acceptance of non-conforming parts or processes without altering underlying technical specifications. A deviation waiver grants written authorization for a supplier to ship a specific quantity of goods that fail to meet baseline dimensional or material standards. The concession stops applying once the designated lot quantity exhausts or the specified expiration date passes, after which baseline drawing requirements resume full legal force.
Operational Trigger
Production line disruptions or raw material shortages frequently force factories to request temporary tolerances. Obtaining a deviation waiver requires engineering review to verify that non-conforming traits do not impair assembly fit or mechanical safety. Authorizations issued during emergency component shortages remain limited to explicit batch numbers recorded on the concession form.
Risk Allocation
Commercial contracts mandate that temporary concessions do not establish permanent engineering precedents or implied contractual modifications. Securing a deviation waiver shifts structural liability to the party granting the approval if part failures trace back to the accepted non-conformity. Suppliers remain responsible for defects outside the exact parameters documented within the approved release.
Financial Impact
Unapproved non-conformities result in lot rejections, expensive factory sorting, and customs clearance delays. Mismanaging a deviation waiver leads to unexpected assembly downtime when non-compliant parts reach manufacturing plants without downstream approval. Documented concessions protect buyers against vendor claims of arbitrary rejection while securing temporary factory output.