The aviation industry relies heavily on contracted and subcontracted services to maintain operational efficiency and safety standards. Whether you're managing ground handling operations, aircraft maintenance, or continuing airworthiness, understanding the regulatory framework for contracted services is essential for compliance and operational excellence.
The Fundamental Principle: You Cannot Outsource Accountability
Across all aviation sectors, one principle remains constant: the primary organization retains ultimate accountability. The European Union's aviation regulations—specifically ORGH.MGM.205 for ground handling, Part-145.A.205 for maintenance organizations, and CAMO.A.205 for continuing airworthiness management—all emphasize this critical concept. While you can delegate tasks, you cannot delegate responsibility for safety.
ORGH.MGM.205: Ground Handling Organizations and Contracted Services
Ground handling organizations operating under EU Regulation 2025/20 face a unique challenge when contracting services. The regulation makes a crucial distinction between certified and non-certified service providers.
Non-Certified Providers: Your Responsibility
When contracting with providers who are not certified, approved, authorised, or declared under EU Regulation 2018/1139, the ground handling organization bears full safety responsibility. This applies to services such as IT support, catering, cleaning, facility maintenance, and office equipment suppliers.
Before awarding any contract to a non-certified provider, organizations must apply their safety management system to identify hazards, assess risks, and implement mitigation measures. This proactive approach ensures that even seemingly routine services don't compromise operational safety.
Certified Providers: Shared Responsibility
When contracting with certified providers—such as other ground handling organizations, certified maintenance facilities, or approved training organizations—the provider assumes primary safety responsibility. However, ground handling organizations must still assess how these services impact their own operations and include them in their risk management processes.
Universal Requirements for All Contracted Services
Regardless of provider type, ground handling organizations must ensure:
- All services comply with applicable requirements
- Aviation safety hazards are risk-assessed within their management system
- The competent authority has access to third-party providers
- All contracts are properly documented
Part-145.A.205: Maintenance Organizations and the Contracting vs. Subcontracting Distinction
Aircraft maintenance organizations approved under Part-145 must understand a critical distinction that directly impacts responsibility allocation: contracting versus subcontracting.
Subcontracting: Under Your Umbrella
Subcontracting occurs when a third party performs maintenance tasks under the Part-145 organization's approval and management system. In this scenario, the subcontracting organization retains full responsibility, regardless of whether the subcontractor holds their own Part-145 approval. The maintenance is released under the primary organization's certificate, making them accountable for quality and compliance.
This arrangement requires the Part-145 organization to:
- Include subcontracted activities in hazard identification and risk management processes
- Implement compliance monitoring per 145.A.200(a)(6)
- Verify that complex maintenance arrangements don't introduce additional risks
- Establish communication channels for occurrence and safety reporting
Contracting: Transfer of Specific Responsibilities
Contracting involves engaging another approved Part-145 organization that releases maintenance under their own approval. In this case, responsibility for those specific tasks transfers to the contracted organization. However, this arrangement must be explicitly allowed by the aircraft owner, operator, or CAMO.
Mandatory Compliance for All Arrangements
Whether contracting or subcontracting, Part-145 organizations must ensure maintenance conforms to applicable requirements and that all aviation safety hazards are considered within their management system. The organization cannot simply delegate tasks and forget about them—active oversight remains essential.
CAMO.A.205: Continuing Airworthiness Management's Dual Approach
Continuing Airworthiness Management Organizations face a unique situation: they both contract maintenance to Part-145 organizations and can subcontract continuing airworthiness management tasks to qualified organizations.
Contracting Maintenance to Part-145 Organizations
When CAMOs contract aircraft maintenance to approved Part-145 facilities, they must ensure these organizations hold valid approvals covering the specific maintenance activities. While the Part-145 organization becomes responsible for the maintenance work itself, the CAMO retains accountability for the overall continuing airworthiness management.
Subcontracting CAM Tasks
Under CAMO.A.125(d)(3), CAMOs can subcontract limited continuing airworthiness tasks to qualified organizations working under the CAMO's management system. These tasks may include:
- Airworthiness directive analysis and planning
- Service bulletin analysis
- Maintenance planning and programme development
- Reliability and engine health monitoring
Critically, subcontracted organizations work under the CAMO's approval, and the CAMO remains fully accountable for all subcontracted activities. The competent authority must have access to subcontracted organizations, and all arrangements must be documented and listed on the organization's certificate.
Common Threads: Safety Management System Integration
All three regulations share fundamental requirements that underscore modern aviation safety philosophy:
- Hazard Identification and Risk Management: Every contracted or subcontracted activity must be subject to systematic hazard identification and risk assessment within the primary organization's safety management system.
- Compliance Monitoring: Organizations cannot simply contract work and assume compliance. Active monitoring programs must verify that contracted activities meet applicable requirements and that providers maintain valid approvals.
- Occurrence Reporting: Communication channels and interfaces must be established with contracted organizations for safety and occurrence reporting, ensuring that critical safety information flows freely across organizational boundaries.
- Authority Access: Competent authorities must be able to access contracted and subcontracted organizations to verify continued compliance, emphasizing transparency throughout the supply chain.
Best Practices for Managing Contracted Services
Successful management of contracted services requires:
- Written Agreements: Clearly define services, responsibilities, deliverables, and safety expectations in formal contracts.
- SMS Integration: Include all contracted activities in your safety management system from day one, not as an afterthought.
- Verification Processes: Establish procedures to verify and maintain evidence that providers hold necessary authorizations and possess adequate resources.
- Stakeholder Communication: Notify aircraft operators, aerodrome operators, and other relevant parties when services are performed by third parties on your behalf.
- Regular Audits: Implement periodic audits of contracted services, whether performed internally or through qualified third-party auditors.
Conclusion: Accountability in Aviation's Connected Ecosystem
Modern aviation operations depend on complex networks of service providers, each contributing specialized expertise. The regulatory framework governing contracted services—whether through ORGH.MGM.205, Part-145.A.205, or CAMO.A.205—recognizes this reality while maintaining unwavering focus on safety accountability.
Understanding these regulations isn't just about compliance; it's about building resilient safety systems that recognize interdependencies while maintaining clear lines of responsibility. As aviation continues to evolve, organizations that master the art of managing contracted services while retaining safety accountability will lead the industry toward ever-higher standards of excellence.
For aviation professionals navigating these requirements, the message is clear: contract wisely, manage actively, and never forget that accountability cannot be outsourced.
Organizing the principles:
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