Component sample testing involves a two-tier quality gate: First Article Inspection (FAI) + Process Part Approval Process (PPAP) (Source: Industry practice). FAI: Verifies the first article complies with drawings (Source: mechpart); PPAP: Demonstrates the production line can consistently produce conforming parts (Source: blog.qa-report)—Principle: Mass production begins only after First Article approval (Source: Industry consensus).
I.
FAI (First Article Inspection)
Definition: Full dimensional verification of a representative production part (Source: mechpart); Standard: AS9102 (3 forms) + Balloon drawing (Source: SAE); Quantity: Minimum of 30 pieces (Source: sadgurudiecast); Key Features: CMM measurement of holes and mating surfaces (Source: sadgurudiecast); Report: Requirement → Actual Measurement → Verdict (Source: mechpart)—FAI: Full dimensions + 30 pieces + CMM (item-by-item mapping).
II.
PPAP (Production Part Approval Process)
Framework: AIAG automotive industry standard (Source: goscpm); Submission Levels: Level 3 is the most common (Source: goscpm); Content: Dimensions + Material testing + Process flow chart + Control plan + PFMEA + Cp/Cpk (Source: zetarmold); PV Testing: Product Validation testing (Source: Ford); Mass Production: “Rate at Run” parts (Source: Ford)—PPAP: Process + Capability + Control (demonstrating long-term stability).
III. Trigger Conditions
New Parts: Mandatory for the first order (Source: Gexpro); Design Changes: Affecting form or function (Source: Gexpro); Process Changes: Manufacturing source, process, or inspection method (Source: Gexpro); New Suppliers: Required when changing manufacturing facilities (Source: Gexpro); Equipment/Tooling: Changes to tooling or equipment (Source: Gexpro)—Trigger: Changes in design, process, or source (full re-validation required).
IV.
Testing Requirements
Approval Prerequisite: Government/customer approval required prior to First Article manufacturing (Source: SAM.gov); Approval Before Production: Production begins only after First Article quality approval (Source: Primary Aimline); Sampling: ANSI/ASQC Z1.4 (Source: Timken); Zero Defects: C=0 acceptance criteria (Source: Timken); Control Plan: Inspection per agreed-upon plan (Source: Timken)—Testing: Approval before production + Zero defects (C=0).
V.
Documentation Requirements
Test Data: Provided as required (Source: Tri-Tech); Control Data: Process control data (Source: Tri-Tech); Material Certificates: Proof of material composition; FAI with Shipment: FAI copy included with each batch (Source: SAAB); Heat Treatment: Hardness and microstructure testing on 30 pieces (Source: Ford)—Documentation: Test data + Material certificates + FAI (complete set included with shipment).
VI. Risk Mitigation
Error-proofing: 100% inspection + error-proofing methods (Source: Ford); Gauges: Gauge R&R acceptance (Source: Ford); Costs: Agreement on sample cost offset; Timing: Testing cycle included in lead time;
Non-conformance: Supplier-funded corrective action (Source: Eargo)—Mitigation: Error-proofing + gauges + costs (clearly defined responsibilities).
VII. Procurement Recommendations
1. First Article Inspection (FAI) (AS9102); 2. Process PPAP (Level 3); 3. Re-inspection triggers (Three Changes); 4. Zero defects (C=0);
5. Documentation accompanying shipment (test data + certificates)—Samples: FAI + PPAP + triggers (two-tier verification).
