AS9102
Understanding AS9102 First Article Inspection
Before a factory starts mass-producing a new RF waveguide filter for a satellite transponder, they must prove that their manufacturing process can actually produce a filter that meets every specification. This proof is the First Article Inspection — a comprehensive, documented verification of the very first unit off the production line.
What Gets Inspected
FAI is not a sampling exercise — it is a 100% verification of every requirement on the engineering drawing and specification:
- Every dimensional feature measured and compared against drawing tolerances.
- Every RF performance parameter (insertion loss, return loss, bandwidth, rejection) tested and compared against specification limits.
- Material certifications for every raw material and purchased component verified against specification requirements.
- Special processes (plating, soldering, heat treatment) verified against qualified process specifications.
The FAI Report
Results are documented on three standard forms: Form 1 (part-level summary), Form 2 (product accountability — tracing materials and processes), and Form 3 (characteristic accountability — the actual measured value vs. specification requirement for every characteristic). This report becomes part of the product's permanent quality record.
Key Equations
AS9102 is an SAE International standard that defines the requirements for performing and documenting First Article Inspection (FAI) in aerospace manufacturing. FAI is the comprehensive,...
Key specifications:
100 % | 0.3 dB | 35 dB | 60 dB | 200 W | 110 GHz
Yield: Y = e−AD (Poisson defect model)
Comparison
| Aspect | AS9102 Spec | Typical Range | Impact | Design Note |
|---|---|---|---|---|
| Primary function | AS9102 is an SAE International standard... | Application-dep. | Critical | Verify in sim |
| Operating range | FAI is the comprehensive, documented ver... | Application-dep. | Critical | Verify in sim |
| Performance | It is performed on the first production... | Application-dep. | Critical | Verify in sim |
| Integration | The FAI report (AS9102 Forms 1, 2, and 3... | Application-dep. | Critical | Verify in sim |
| Trade-off | This proof is the First Article Inspecti... | Application-dep. | Critical | Verify in sim |
Frequently Asked Questions
When is a new FAI required?
AS9102 defines trigger events: first production of a new part number, change in manufacturing process, change in manufacturing location, change in materials or suppliers, production break exceeding two years, and after corrective action that changes the manufacturing process. Any of these events requires a full or partial FAI to re-establish confidence that the production process produces conforming product.
Can partial FAI be performed?
Yes. When a trigger event affects only specific characteristics of the product, a partial FAI may be performed covering only the affected characteristics, with reference to a previous complete FAI for the unaffected characteristics. For example, if a plating process changes but the RF design is unchanged, partial FAI would cover the plating-related characteristics while referencing the original FAI for RF performance data.
How does FAI differ from incoming inspection?
FAI is a one-time, comprehensive verification performed by the manufacturer on the first production unit to establish process capability. Incoming inspection is an ongoing, sampling-based verification performed by the customer on every delivered lot to verify continued conformance. FAI establishes the baseline; incoming inspection monitors ongoing compliance against that baseline.