Inspection & Testing · Component review guide · Litian Yunde
由人工智能生成的概念示意图；并非利天云德的产品照片或经过验证的设计。.
验收抽样需要明确的批次、指定的特性以及商定的判定方案。对于碳纤维货物，在选取样本之前应先界定总体。仅检查手头方便的一小批零件并不等同于统计验收方案，且首件检验结果本身并不意味着后续所有批次均可被接受。.
Describe what belongs to the lot
Record the item reference, applicable version, quantity and any process or material grouping required by the order. If one shipment contains different constructions or revisions, review whether they belong to separate lots. Do not make the receiving box the only lot definition when it mixes different populations. Keep the selected samples linked to their lot and preserve required serial or batch identities.
Agree the characteristic and decision rule
Appearance, hole position, wall thickness and documentation checks may require different methods and coverage. State which characteristics the sampling plan addresses and what requires other inspection. A competent quality owner should select any applicable standard, sample size, acceptance/rejection numbers and selection method. This article does not invent an AQL or sample quantity. Sampling involves producer and consumer risks, so the plan should be part of the agreement rather than chosen after a defect is found.
Keep disposition specific to the evidence
Record how samples were selected, the findings and the decision against the approved plan. If the lot is held, document its next route without silently removing defective pieces and declaring the rest accepted. Screening, rework and resubmission need defined instructions and traceable records. Keep first-article approval, routine lot acceptance and any performance-validation requirements separate, even when they concern the same component reference.
Example: two versions in one delivery
A shipment contains an earlier and a later cover version. The receiver initially proposes one sample count for the whole box. The review separates the populations and applies the agreed requirements to each identified lot. The resulting record shows which version and quantity each decision covers.
此为示例场景，并非客户案例或已报告的生产结果。.
下单前需确认的细节
| 评论对象 | 记录以示同意 |
|---|---|
| Population | Item, revision, construction and lot quantity. |
| 报道范围 | Characteristic and inspection method. |
| Plan | Approved selection and acceptance/rejection rules. |
| Disposition | Lot-specific decision and resubmission route. |
买家常问的问题
Is first-article approval a shipment sampling plan?
No. It addresses a different purpose and does not replace the agreed routine lot acceptance process.
Can the sampling plan be changed after seeing defects?
Changing the plan after the results can change the decision basis. Use an authorised, documented process.
技术背景及相关阅读资料
背景资料： NIST: Lot Acceptance Sampling. 仅供背景参考；项目检查清单仅为编辑指导，本参考资料并不构成供应商认证或零部件批准。.