Aerospace quality management systems

Beyond manufacturing quality

In aerospace, quality management systems (QMS) go beyond standard manufacturing quality to ensure that every process, component and repair complies with non-negotiable safety standards. The aerospace industry builds on standard commercial quality frameworks by embedding specialized controls to manage risk across the supply chain.

The AS9100 standard family

Maintained by the International Aerospace Quality Group (IAQG), the AS9100 series takes the process-based principles of ISO 9001 and adds aviation, space and defense requirements on top.

• AS9100, design and production: organizations that design, develop or manufacture aerospace hardware, software and systems.
• AS9110, maintenance and overhaul: maintenance, repair and overhaul (MRO) facilities, FAA Part 145 repair stations and military depot maintenance operations.
• AS9120, stockists and distributors: organizations that procure, pass through and distribute aerospace parts, raw materials and hardware without altering the product.

Certification architecture

Rather than requiring every operator or manufacturer, such as Boeing or Airbus, to audit thousands of suppliers individually, the industry uses a standardized third-party audit scheme. The IAQG establishes the scheme rules in AS9104/1. Those rules govern the accredited certification bodies, whose auditors audit and certify aerospace suppliers. Certified suppliers are then listed in the global OASIS database.

AS9104/1 and the OASIS database

• AS9104/1: standardizes auditor qualifications, audit duration, assessment methods and certification body oversight, so audits are consistent around the world.
• OASIS: certification status and audit results are recorded in the IAQG Online Aerospace Supplier Information System (OASIS). Anyone can check whether a supplier is certified, and customers can view detailed audit results where the supplier grants access.

Configuration management

The practical value of the AS9100 standards shows in daily shop-floor practice, beginning with baseline control. Configuration management ensures every component, assembly and maintenance action matches the approved drawing revisions, engineering change orders (ECOs) and active software baselines.

Foreign object debris (FOD) prevention

Physical protection of the product relies on strict tool accountability, shadow boards and clean-area discipline, preventing foreign objects such as wrenches, rivets and safety wire clippings from contaminating airframes or engines.

Counterfeit and unapproved parts prevention

Supply chain integrity depends on full material traceability from raw material suppliers through to final delivery, and on verifying authorized release documentation, such as FAA Form 8130-3 or EASA Form 1, to keep suspected unapproved parts (SUPs) out of inventory.

First article inspection (AS9102)

First article inspection (FAI) validates a process. It is a complete, documented evaluation verifying that the first part produced by a new or significantly changed manufacturing process meets every dimension, note and tolerance on the engineering drawing.

Root cause corrective action (RCCA)

When non-conformances occur, structured problem-solving methods such as 8D or 5-Why analysis are used to find and eliminate the systemic root cause rather than apply a superficial fix.

Quality management vs. regulatory approval

A common point of confusion is the difference between industry quality certification and civil aviation authority approval. The two are complementary.

• AS9100, AS9110 and AS9120 are voluntary industry standards. They provide customer quality assurance, are often a business-to-business requirement, and drive process consistency and efficiency.
• Civil aviation approvals, such as FAA Part 145, FAA Part 21 or EASA Part 145, are legally mandatory. They are required by law to perform the work and confirm airworthiness compliance.

A certificate is not a license

Holding an AS9110 quality certificate does not give an organization legal authority to sign off aircraft maintenance. A maintenance facility still needs its regulatory approvals, such as an FAA Part 145 repair station certificate, to approve work for return to service. Quality systems and regulatory compliance reinforce one another.

Key takeaways

• Targeted standards: AS9100 for design and production, AS9110 for maintenance and MRO, AS9120 for distributors.
• AS9104/1 and OASIS: AS9104/1 governs the credibility of third-party audits, and OASIS shares supplier certification data globally.
• Shop-floor discipline: daily quality revolves around configuration control, FOD prevention, parts traceability, first article inspection (AS9102) and root cause corrective action.
• A quality standard is not a regulatory license: quality certification complements, but never replaces, legally required approvals such as FAA Part 145 or Part 21.