The Complete Guide to AS9102 Rev C First Article Inspection (FAI)

1. What is AS9102 First Article Inspection?

AS9102 is the aerospace industry standard established by the International Aerospace Quality Group (IAQG) for conducting and documenting First Article Inspections. When an aerospace supplier produces a new part or modifies an existing manufacturing process, an AS9102 FAI provides documented physical and functional verification that manufacturing processes are capable of producing parts that consistently meet design specifications.

Whether you are supplying parts to prime defense contractors, commercial aviation programs, or Tier-1 aerospace integrators, submitting a fully compliant AS9102 package is a mandatory prerequisite before serial production parts can be accepted.

2. Primary Purpose & Scope of an FAI

The goal of an AS9102 FAI is not merely to verify a single sample part; it validates the entire production system. This includes:

• Verifying that all engineering design characteristics, notes, and specifications are captured and verified.
• Confirming that manufacturing planning, tooling, CNC programs, and work instructions produce compliant features.
• Ensuring raw materials, special processes (heat treat, anodizing, passivation), and standard hardware comply with purchase order requirements.
• Establishing a baseline for ongoing process capability and quality control.

3. Deep Dive into Forms 1, 2, and 3

The AS9102 report is structured into three standardized forms. Every field must be completed or marked with N/A (Not Applicable) when appropriate.

Form 1: Part Number Accountability

Form 1 identifies the top-level part being inspected, associated sub-assemblies, and overall report status. It contains details like Part Number, Part Name, Serial Number, Drawing Revision, Purchase Order Number, Organization Name, and whether the FAI is a Full FAI or Partial FAI. It also records customer signoff and baseline approvals.

Form 2: Product Accountability (Materials, Special Processes & Functional Testing)

Form 2 accounts for raw materials, special processes (such as NDT, plating, chemical milling, thermal coating), and functional test requirements. Each entry requires traceability back to the Certificate of Conformance (CoC), mill test report (MTR), or laboratory test report number.

Form 3: Characteristic Accountability, Verification and Compatibility Evaluation

Form 3 is the core dimensional and feature inspection sheet. Every single characteristic identified on the ballooned engineering drawing (dimensions, GD&T feature control frames, title block tolerances, surface finishes, notes) is logged here with:

• Char No. (Characteristic Number): The bubble number corresponding to the drawing.
• Drawing Location: Sheet number and grid zone coordinates (e.g., Sheet 1, Zone C4).
• Characteristic Designator: Key Characteristics (KC), critical, or major feature flags.
• Requirement: The nominal specification and upper/lower tolerance limits.
• Results: The actual measured physical dimension.
• Inspection Method / Tooling: Caliper, micrometer, CMM, optical comparator, thread gauge, etc.
• Accept / Reject Status: Non-conformance number if non-compliant.

4. Characteristic Ballooning & Numbering Rules

Drawing ballooning (also known as bubble drawing) is the process of marking every dimensional requirement, tolerance, and engineering note with a sequential numbered balloon. Follow these foundational rules:

1. 100% Characteristic Accountability: Every linear dimension, angular dimension, hole diameter, chamfer, thread specification, GD&T callout, title block default tolerance, and drawing note MUST have a corresponding balloon number.
2. Logical Sequence: Number balloons logically (e.g., top-to-bottom, left-to-right, or clockwise starting from the top-left). This saves inspectors hours when finding characteristics on complex multi-sheet blueprints.
3. Grid Coordinates: Always note the zone (e.g., Sheet 2, Zone B3) on Form 3 to allow auditors to locate the feature instantly.
4. Decomposing Multi-Element Features: When a callout reads 4X Ø.250 ±.005, each of the four individual holes should be uniquely accountable (e.g., Balloon 12-1, 12-2, 12-3, 12-4 or 4 distinct measurement records) unless sampling is explicitly permitted by customer engineering.

5. Full FAI vs. Partial (Delta) FAI Triggers

Quality engineers often ask: "Do we need a new Full FAI or can we perform a Partial (Delta) FAI?" AS9102 Section 4.6 outlines specific triggers:

When is a Full FAI Required?

• First time manufacturing a new part number.
• A lapse in production of two or more years (24 months).
• A complete relocation of the manufacturing facility or major production equipment replacement.

When is a Partial (Delta) FAI Required?

• Engineering Change: A drawing revision that affects fit, form, or function. Only characteristics affected by the change must be inspected and documented.
• Manufacturing Source / Process Change: Changing CNC machines, cutting tools, fixturing, tooling, or sequence of operations that could affect product characteristics.
• Sub-tier Supplier Change: Changing a special processing vendor (e.g., switching heat treating or anodizing suppliers).
• Corrective Action: Following a quality non-conformance requiring re-verification.

6. Top 5 Reasons FAIs Get Rejected by Auditors

Avoiding these frequent mistakes prevents costly shipment delays and supplier score penalties:

• Missing Drawing Notes: Forgetting to balloon general drawing notes (such as deburr requirements, marking specs, or cleanliness standards) as accountable items on Form 3.
• Unverified Title Block Tolerances: Failing to account for dimensions governed by standard block tolerances (e.g., .XX = ±.010, .XXX = ±.005).
• Missing Material Certifications: Form 2 missing traceability to the original heat lot or chemical composition test report.
• Discrepancies in Revision Levels: The drawing revision listed on Form 1 does not match the purchase order or CAD model dataset.
• Improper Handling of N/A Fields: Leaving fields completely blank rather than entering N/A.

7. Automating the FAI Generation Process

Traditionally, quality engineers spend anywhere from 3 to 10 hours per drawing manually stamping bubble annotations and re-typing nominal dimensions, upper/lower tolerances, and GD&T symbols into Excel spreadsheets.

Modern AI-driven inspection software like BalloonPlot uses specialized computer vision to recognize CAD text, dimension leaders, and ASME Y14.5 geometric frames automatically:

• Automatically extracts nominal dimensions and calculates upper/lower limits.
• Sequentially balloons drawings and generates coordinate zones in seconds.
• Exports directly to AS9102 Rev C Excel and PDF Form 1, 2, and 3 packages.
• Maintains 100% on-premise local data security for ITAR and defense IP.

8. Frequently Asked Questions (FAQ)