AS 9110 Certification
Aerospace Maintenance, Repair & Overhaul (MRO) Quality Management System
Introduction to AS 9110
In aerospace, maintenance errors can be just as dangerous as manufacturing defects. For organisations responsible for maintaining, repairing, or overhauling aircraft and components, quality management is inseparable from flight safety and regulatory compliance. AS 9110 provides the internationally recognised framework that ensures MRO organisations operate with the highest levels of control, traceability, and safety assurance.
AS 9110 is the aerospace quality management standard specifically developed for Maintenance, Repair and Overhaul (MRO) organisations. It builds on ISO 9001 while introducing additional, aviation-critical requirements covering airworthiness, maintenance control, release certification, and human factors.
What is AS 9110?
AS 9110 is a quality management system (QMS) standard designed for organisations that maintain aircraft, engines, components, or parts. Unlike EN/AS 9100 (manufacturing) or AS 9120 (distribution), AS 9110 focuses exclusively on maintenance activities.
The standard is maintained by the International Aerospace Quality Group (IAQG) and is aligned globally with EN 9110 (Europe) and JISQ 9110 (Asia).
In practical terms, AS 9110 helps MRO organisations:
- Ensure continued airworthiness of aircraft and components
- Control maintenance processes and approvals
- Reduce human-error-related incidents
- Meet OEM, customer, and regulatory expectations
For many aerospace customers, AS 9110 certification is a prerequisite for approval.
Why AS 9110 was created
Historically, maintenance organisations were audited against a mix of aviation regulations and customer-specific quality requirements. This led to inconsistency, duplication, and gaps—particularly around human factors, documentation, and release-to-service controls.
Harmonisation
Harmonise quality requirements for aerospace maintenance worldwide
Process Control
Strengthen maintenance process control and traceability
Safety Focus
Reduce safety risk caused by maintenance error
Global Confidence
Provide global confidence in MRO capability
The standard recognises that maintenance is a high-risk, safety-critical activity requiring its own dedicated quality framework.
Why AS 9110 matters for UK organisations
For UK MRO organisations, AS 9110 is often essential to operate within the global aerospace supply chain. It is frequently required by:
Aircraft and engine OEMs
Original Equipment Manufacturers require certified MRO partners
Airlines and leasing companies
Operators demand assured maintenance quality
Defence primes and MOD suppliers
Military contracts require rigorous MRO standards
International aviation customers
Global recognition and confidence in UK MRO capability
AS 9110 also aligns strongly with regulatory oversight from the Civil Aviation Authority (CAA) and international aviation authorities, reinforcing confidence in maintenance control and airworthiness management.
Certification demonstrates that your organisation meets international best practice, not just minimum regulatory compliance.
Who AS 9110 is for
AS 9110 applies to organisations involved in:
✈️ Aircraft Maintenance Organisations (AMOs)
Organisations approved for aircraft maintenance and repair
⚙️ Engine & Component Overhaul Facilities
Specialist facilities for engine and component overhaul
🔧 Line and Base Maintenance Providers
Providers of scheduled and unscheduled maintenance
🛡️ Defence & Military MRO Providers
Military aviation maintenance and support organisations
🔬 Specialist Repair Organisations
Specialist repair and testing organisations
It is suitable for civil, defence, and space-related maintenance activities.
Key principles of AS 9110
AS 9110 includes all ISO 9001 requirements plus maintenance-specific aerospace controls, including:
Maintenance Process Control
Clear definition, planning, and execution of maintenance activities.
Airworthiness & Release to Service
Robust certification and approval processes for release to service.
Human Factors Management
Addressing fatigue, competence, communication, and error prevention.
Configuration & Technical Data Control
Ensuring correct manuals, revisions, and instructions are used.
Risk Management
Identifying and mitigating maintenance-related risks.
Traceability & Records
Full control of maintenance records and history.
Benefits of AS 9110
Internal Benefits
- Improved maintenance consistency and control
- Reduced risk of maintenance error
- Clear accountability and competence management
- Stronger safety and reporting culture
Strategic Benefits
- Approved supplier status with OEMs and operators
- Increased customer and regulator confidence
- Access to international MRO contracts
- Enhanced reputation for safety and reliability
Compliance & Risk Benefits
- Strong alignment with aviation regulatory requirements
- Reduced exposure to safety incidents and liability
- Robust defence during regulatory or customer audits
What AS 9110 auditors actually look for
AS 9110 audits are rigorous and operationally focused. Auditors typically assess:
Maintenance Planning & Control
Evidence of controlled and documented maintenance processes
Human Factors Awareness
Training, reporting, and mitigation of human error risks
Technical Data Management
Correct and current documentation, manuals, and procedures
Release to Service Controls
Certification, authorisation, and airworthiness release processes
Training & Competence
Engineer qualifications, approvals, and continuing competence
Evidence of Use
Records showing the system operates effectively day-to-day
Audits go far beyond paperwork and focus heavily on shop-floor and hangar activity.
AS 9110 in practice (real-world examples)
Aircraft Maintenance Organisation
A UK MRO achieves AS 9110 to support contracts with international airlines. Improved maintenance control and documentation strengthen regulatory confidence and customer trust.
Component Overhaul Facility
A component repair organisation uses AS 9110 to formalise human factors controls and reduce maintenance-related non-conformities—improving safety and audit outcomes.
Common mistakes when implementing AS 9110
Treating It Like ISO 9001
AS 9110 has far greater operational depth and safety focus than ISO 9001.
Underestimating Human Factors Requirements
This is a major audit and safety emphasis area.
Weak Control of Technical Data
Out-of-date manuals and instructions are a common failure point.
AS 9110 certification process
Stage 1: Readiness & Documentation Review
The auditor checks that your QMS meets AS 9110 requirements.
Stage 2: Certification Audit
A detailed on-site audit evaluates implementation and effectiveness.
Surveillance Audits
Annual audits confirm continued compliance.
Recertification
A full reassessment every three years renews certification.
How long does AS 9110 certification last?
AS 9110 certification is valid for three years, subject to successful annual surveillance audits. Failure to address major non-conformities can lead to suspension or withdrawal, often with immediate commercial impact.
How much does AS 9110 cost in the UK?
Costs depend on:
- Size and complexity of maintenance activities
- Number of staff and approvals
- Number of sites and scope of work
Typical costs include:
- accredited certification audit fees
- Consultancy and gap analysis (if required)
- Training and system maintenance costs
Although demanding, AS 9110 delivers strong ROI through market access, safety assurance, and reduced risk.
AS 9110 and integration with other standards
AS 9110 follows the Annex SL High-Level Structure, allowing integration with:
ISO 9001
Quality Management foundation
ISO 14001
Environmental Management
ISO 45001
Health & Safety
ISO 27001
Information Security
Many MRO organisations operate a fully Integrated Management System (IMS).
Who should NOT implement AS 9110?
If your organisation does not perform aerospace maintenance or overhaul activities and has no customer or regulatory requirement, AS 9110 is unlikely to be appropriate. The standard requires strong operational discipline and continuous oversight.
Frequently Asked Questions (FAQs)
Is AS 9110 mandatory in the UK?
No, but it is often a contractual requirement for MRO approval.
Is AS 9110 the same as EN 9110?
Yes. They are regional versions of the same global standard.
Can SMEs achieve AS 9110?
Yes. Many UK MRO SMEs are successfully certified.
Is AS 9110 harder than ISO 9001?
Yes. It includes significant aviation-specific and safety-critical requirements.
Ready to achieve AS 9110 certification?
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