Approval, Compliance & Safety Advisory for EASA Part 145 Approved Maintenance Organisations
Aerospace and Aviation Consulting Services (AACS) provides specialist regulatory, compliance, and safety advisory to Approved Maintenance Organisations (AMOs) operating under EASA Part 145, UK Part 145, and equivalent national airworthiness frameworks.
Our capability covers the full AMO lifecycle — from initial Part 145 approval application through to ongoing compliance management, Maintenance Organisation Exposition (MOE) development, Safety Management System implementation, quality system design, and preparation for authority oversight audits. We support line maintenance organisations, base maintenance facilities, component shops, and avionics workshops across both commercial and general aviation sectors.
AACS aligns all advisory with EASA Regulation (EU) No 1321/2014, UK Part 145 post-Brexit requirements, ICAO Annex 6 maintenance standards, and the airworthiness requirements of client national aviation authorities, ensuring that compliance frameworks are internationally robust and operationally sustainable.
Core Part 145 Capabilities
Part 145 Approval & Initial Certification
Achieving Part 145 approval is a complex regulatory process that demands precise documentation, structured engagement with the competent authority, and a thorough understanding of the regulatory requirements applicable to the scope of work sought. AACS supports organisations through every stage of the approval process.
Services include:
• Part 145 approval scope definition and capability assessment
• Pre-application gap analysis against EASA Part 145 / UK Part 145 requirements
• Maintenance Organisation Exposition (MOE) initial development
• Competent authority pre-application meeting preparation and support
• Certifying staff and support staff qualification and authorisation framework design
• Facilities, tooling and equipment compliance assessment
• Contracted maintenance and supplier control framework establishment
• Approval class and rating advisory — A (aircraft), B (engines), C (components), D (specialist services)
Our advisors have direct experience navigating Part 145 approvals with EASA, UK CAA, EASA-equivalent national authorities, and bilateral partner authorities, providing clients with regulatory intelligence that accelerates the approval process.
Maintenance Organisation Exposition (MOE) Development & Review
The Maintenance Organisation Exposition is the defining document of a Part 145 organisation. It must accurately describe all aspects of the organisation’s structure, procedures, and maintenance practices, and must remain current as the organisation evolves. AACS has extensive experience developing and maintaining MOEs across a wide range of AMO types and sizes.
Services include:
• Full MOE development from initial draft through to authority acceptance
• MOE upgrade and revision to reflect organisational or regulatory change
• Part 145 AMO procedures manual and supporting documentation development
• MOE gap analysis and corrective action planning
• Document control system design and revision management procedures
• Part 21 Subpart G CAMO interface procedures development
• Contracted maintenance procedures and supplier approval frameworks
• Technical records management procedures and airworthiness data control
AACS-produced MOEs are written for authority acceptance and long-term operational usability. We ensure that the MOE accurately reflects how the organisation actually works, not simply what the regulation prescribes.
Compliance Monitoring & Quality System Design
An effective compliance monitoring system is a regulatory requirement under Part 145 and a fundamental safeguard of airworthiness. AACS designs and implements compliance monitoring frameworks that satisfy authority requirements while providing genuine operational value.
Services include:
• Compliance monitoring system design aligned with Part 145.A.65 requirements
• Internal audit programme development — schedule, methodology and reporting
• Audit checklist development against current regulatory requirements
• Finding classification, corrective action and root cause analysis processes
• Accountable Manager and Nominated Person briefing and advisory support
• Independent compliance audit and second-opinion review services
• Supplier and contracted organisation audit programme design
• Authority finding response support and corrective action plan preparation
• Preparation for EASA, UK CAA and national authority oversight audits
Our compliance monitoring frameworks are designed to identify and address airworthiness risks before they become regulatory findings, protecting both the approval and the organisation’s commercial continuity.
Safety Management System for Part 145 Organisations
The requirement for Part 145 organisations to implement a Safety Management System reflects the growing recognition that proactive safety management is as important in maintenance as it is in flight operations. AACS designs and implements SMS frameworks specifically tailored to the AMO environment.
Services include:
• SMS framework design aligned with ICAO Annex 19 and Part 145.A.200 requirements
• Hazard identification and maintenance risk assessment processes
• Safety Performance Indicator (SPI) development for maintenance environments
• Occurrence reporting system design and just culture policy development
• Maintenance error investigation methodology — HFACS, TapRoot, MEDA
• Safety review board structure and governance documentation
• SMS integration with the compliance monitoring system
• Safety culture assessment and Human Factors programme development
• SMS maturity evaluation and improvement roadmap
Effective SMS in a maintenance environment goes beyond error reporting. AACS builds systems that surface latent organisational conditions and systemic risks — the factors that accident investigation consistently identifies as root causes in maintenance-related events.
Human Factors & Maintenance Error Management
Human performance is the single largest contributor to maintenance errors. AACS provides specialist Human Factors advisory and training to Part 145 organisations seeking to reduce maintenance-related airworthiness risk through a structured understanding of human performance in the maintenance environment.
Services include:
• Human Factors programme design aligned with Part 145.A.30 and AMC 145.A.30(e)
• Maintenance Error Decision Aid (MEDA) investigation process implementation
• Error-likely conditions analysis and mitigation strategy development
• Shift handover, task card design and work environment risk assessment
• Human Factors training programme design and delivery for certifying staff
• Fatigue risk assessment and shift pattern review for maintenance operations
• Continuation training programme design incorporating Human Factors content
• Human Factors audit of maintenance procedures and documentation
Our Human Factors advisory draws on accident investigation experience and operational research to identify the specific error-likely conditions present in each client’s maintenance environment, rather than delivering generic awareness training.
ISO 9001 Quality Management for AMOs
Many Part 145 organisations seek ISO 9001 certification to complement their Part 145 compliance framework, satisfy customer requirements, or support tenders for commercial maintenance contracts. AACS designs and implements integrated ISO 9001 Quality Management Systems that align with the Part 145 compliance monitoring structure rather than duplicating it.
Services include:
• ISO 9001:2015 QMS design and implementation for Part 145 organisations
• Integration of ISO 9001 processes with Part 145 compliance monitoring requirements
• Quality manual and documented procedures development
• Process mapping, risk and opportunity assessment for maintenance operations
• Internal audit programme aligned with both ISO 9001 and Part 145 requirements
• Management review framework and continual improvement system design
• Preparation for third-party ISO 9001 certification audits
• Combined ISO 9001 / ISO 45001 (Health & Safety) integrated system advisory
An integrated approach avoids duplication of audit effort and documentation burden, enabling organisations to maintain both Part 145 approval and ISO certification through a single, coherent quality and compliance framework.
Integrated Part 145 Advisory Philosophy
AACS approaches Part 145 advisory with a clear conviction: airworthiness is not an administrative outcome — it is the product of a disciplined organisation, well-designed systems, and a workforce that understands why the rules exist.
✔ Part 145 approval must be built on procedures that reflect how the organisation actually works
✔ Compliance monitoring must identify and correct systemic issues, not merely record findings
✔ Safety Management Systems in maintenance must address human performance, not just technical error
✔ MOE documentation must be accurate, current, and usable — not a static approval artefact
✔ Human Factors programmes must be operationally specific, not generic awareness training
✔ ISO 9001 and Part 145 should be integrated into one coherent system, not maintained in parallel silos
We deliver advisory that is independently verified, operationally credible, and built on over 30 years of real-world aviation maintenance regulatory expertise.