4.1 Governance and operating model

It

is statistically impossible to inspect 100% of incoming components (e.g., a reel of 10,000 resistors). Therefore, Incoming

1. Supplier Quality ControlMission and Boundaries

What SQ guarantees (IQC)risk reliescontrol, ondefect statisticalprevention, samplingresponse) plansand definedwhat bySQ does ISO 2859-1not (ANSI/ASQ Z1.4).

The AQLown (Acceptablecommercial terms, supplier selection). Interfaces: IQC, Production, Engineering, PM.

2. Supplier Quality Limit)

RACI

AQL is the maximum percent defective that can be considered satisfactory for a process average.

• CriticalWho Defectscan: (Safety/Regulatory):block AQLincoming 0.01lots, (effectivelyissue ZeroSCAR, Defects).
• Majorapprove Defectsdeviations, (Functionalaccept Failure):risk, AQLclose 0.65corrective oractions, 1.0.
• Minortrigger Defectsre-audit, (Cosmetic):escalate AQL 2.5 or 4.0.stop-ship.

Execution of the Plan

3. LotSupplier Size:Quality Process Map Determine total quantity received.
2. Inspection Level: Standard is Level II. (Use S-1 through S-4 for destructive testing).
3. Code Letter: Use ISO 2859 table to find the sample size code (e.g., Lot of 5,000 = Code "L").
4. Decision Rule: Code "L" requires inspecting 200 units.

• Scenario:One AQLdiagram 0.65. Accept on 3 defects, Reject on 4.
• Outcome: If 4 defects are found, the entire lot is rejected and returned to the vendorpage (RTV)text orversion 100%now): sortedQualification atsupport the→ vendor'sincoming expense.control → escapes → SCAR → effectiveness → monitoring → re-audit.

Final Checklist

Parameter	Standard Setting	Meaning
Sampling Standard	ISO 2859-1 / ANSI Z1.4	Statistical basis for inspection
Inspection Level	Level II	Normal discrimination power
Major AQL	0.65	Functional failure limit
Minor AQL	2.5	Cosmetic failure limit