What is an acceptable defect rate?
This figure of 11 or more defective products is known as the rejectable quality level (RQL). The AQL is an important statistic for companies seeking a Six Sigma level of quality control, which is a quality-control methodology developed in 1986 by Motorola, Inc. AQL is also known as the acceptable quality limit.
What does AQL of 0.4 mean?
0% for critical defects (totally unacceptable: a user might get harmed, or regulations are not respected). 2.5% for major defects (these products would usually not be considered acceptable by the end user). 4.0% for minor defects (there is some departure from specifications, but most users would not mind it).
What is the standard AQL?
Under normal inspection, AQL levels range from 0.065 to 6.5. The larger the AQL level, the more lenient the inspection. For general consumer products inspection, AQL level is usually set at 2.5, which implies a zero tolerance for critical defect, 2.5 for major defects, and 4 for minor defects.
What does AQL 0.65 mean?
AQL means the poorest level of quality that is considered acceptable in a particular population or in a pre-defined sample size. For example: “AQL is 0.65%” means “I want no more than 0.65% defective items in the whole order quantity, on average over several production runs with that supplier”.
What does Ltpd mean?
LTPD – Lot Tolerance Percent Defective The LTPD of a sampling plan is a level of quality routinely rejected by the sampling plan. It is generally defined as that level of quality (percent defective, defects per hundred units, etc.)
What is the difference between AQL and LTPD?
The Acceptance Quality Limit (AQL) is generally defined as the percent defectives that the plan will accept 95% of the time. The Lot Tolerance Percent Defective (LTPD) is generally defined as percent defective that the plan will reject 90% of the time.
What is LTPD and AQL?
AQL is Acceptable Quality Level. LTPD – Lot Tolerance Percent Defective: the value of incoming quality where it is desirable to reject most lots. The quality level is unacceptable. This is the RQL expressed as a percent defective. D.
Is Ltpd same as RQL?
The RQL is the minimum Defect rate that not acceptable to ship; in other words it is the rate that you want to detect and reject. A LTPD plan is an RQL based plan. LTPD stands for Lot Tolerance Percent Defective and is generally the defect rate that will be rejected 90% of the time.