What is AQL?
(ACCEPTANCE QUALITY LIMIT minimum acceptable quality level) refers to the worst permissible process average quality level when a continuous series of batches are submitted for acceptance sampling.
The AQL table specifies the maximum allowable number of defects AC. When the actual number of defects found is less than AC, the inspection is qualified, and when the actual number of defects is greater than AC, the inspection is unqualified.
In AQL sampling, the number of samples taken is the same. The smaller the value following AQL, the less the number of defects allowed, indicating that the higher the quality requirement, the relatively stricter inspection (AQL 1.5 has higher quality requirements than AQL 2.5).
Number of samples: The number of samples to be sampled in the same batch, referred to as: N
Acceptable quantity: the maximum acceptable defect quantity in the same batch, abbreviated as: Ac
Return quantity: the lowest defect quantity that caused the return of goods in the same batch, referred to as: Re
Number of nonconforming products: the number of nonconforming products found after inspecting the samples one by one, referred to as: d
CR: (Critical) Fatal flaw.
Ma: (Major) Serious defect, also called major defect.
Mi¬: (Minor) minor defects, also called minor defects.
Finished products shall be inspected according to receiving quality limits: AQL=0.01(CR), AQL=1.0(Ma), AQL=2.5(Mi);