AS9103

AS9103 is an aerospace industry standard that specifies requirements for controlling and improving key characteristics using statistical methods. It focuses on establishing and maintaining process capability for features that are critical to safety, performance, interchangeability, or regulatory compliance in aerospace products.

What AS9103 covers

AS9103 commonly refers to requirements for:

• Identifying key characteristics on parts, assemblies, and processes
• Planning how those characteristics will be measured and monitored
• Collecting and analyzing statistical data, often using capability indices such as Cp, Cpk, Pp, and Ppk
• Demonstrating initial and ongoing process capability for key characteristics
• Applying corrective actions and process adjustments when capability does not meet defined criteria
• Documenting agreements between customers and suppliers about capability targets and control methods

In industrial operations, AS9103 is typically applied within quality management systems, MES, or SPC tools to structure how key characteristics are selected, measured, and controlled across programs and supply chains.

Operational use in manufacturing

In aerospace manufacturing environments, AS9103 often shows up as:

• Requirements in purchase orders, supplier quality clauses, or program quality plans
• Characteristic control plans that define sampling, data collection, and capability calculations
• Integration with SPC software or MES to record measurements and flag capability issues
• Evidence packages used in audits, customer reviews, or approvals for process changes

AS9103 does not replace core quality tools such as Statistical Process Control (SPC) or Advanced Product Quality Planning (APQP). Instead, it structures how those tools are applied to key characteristics in aerospace programs, including expectations for supplier data and ongoing capability demonstration.

Relationship to other aerospace standards

• AS9100: Sets requirements for aerospace quality management systems. AS9103 provides more specific requirements around key characteristic control that can support compliance with AS9100 process control clauses.
• AS9102: Focuses on First Article Inspection (FAI). AS9102 verifies that the product and process setup meet requirements at launch, while AS9103 focuses on ongoing statistical control and capability of key characteristics during production.
• AS9145: Addresses advanced product quality planning and production part approval. AS9103 can be one of the tools embedded in an AS9145-aligned APQP and PPAP approach, especially for high-risk or critical features.

Common confusion

• AS9103 vs. SPC: SPC is a general methodology and toolset for statistical monitoring of processes. AS9103 is a standard that defines how those methods should be applied and documented for key characteristics in aerospace.
• AS9103 vs. AS9102: AS9102 deals with first article inspection of all required characteristics for a configuration baseline. AS9103 focuses on a subset of key characteristics and their long-term statistical control and capability.

Tie-back to the site context

Within connected manufacturing systems, AS9103 requirements influence how MES, SPC, and quality systems manage key-characteristic data. This includes how characteristics are defined in digital work instructions, how measurement data flows from inspection equipment into databases, how capability metrics are calculated, and how evidence is retained for audits and customer reviews.