A Global Overview with a Focus on EASA
Maintenance is essential to aviation safety and spans a wide variety of aircraft types from large commercial jets to small piston engine trainers. Regulatory systems across the globe define who can perform maintenance, under what conditions, and with which approvals. While the European Union Aviation Safety Agency (EASA) sets one of the most structured regulatory models, many other regions follow comparable practices dependent on their local CAA (Civil Aviation Authority).
This article primarily explores the EASA framework for both complex and general aviation (GA) maintenance approvals, while providing international context with comparisons to the USA, South Africa, and parts of Asia.
EASA Maintenance Approvals: Part-145 and Part-CAO
EASA divides maintenance approval schemes based on aircraft complexity and use:
1. EASA Part-145 – For Complex and Commercial Aircraft
This regulation governs Approved Maintenance Organizations (AMOs) working on large aircraft (MTOM > 5,700 kg), commercial air transport aircraft, and turbine-powered helicopters.
Key requirements:
- Facility and tooling standards aligned with the scope of work (line, base, component).
- Certifying staff must hold licenses, with categories A (simple tasks), B1 (mechanical), B2 (avionics), and C (base maintenance sign-off).
- A Quality System including independent audits is mandatory.
- Continuous oversight by Civil Aviation Authorities (CAAs), who audit compliance.
Part-145s ensure a high level of accountability, traceability, and documentation, particularly for safety sensitive operations.
2. EASA Part-CAO – Combined Airworthiness Organisation (for GA and Non-Commercial Ops)
Introduced to simplify oversight of general aviation and non-complex aircraft, Part-CAO replaced former Part-M Subpart F and G approvals.
Applicable to:
- Aircraft up to 2,730 kg
- Non-commercial operations of larger aircraft
- Sailplanes, balloons, and piston helicopters
Highlights of Part-CAO:
- A more cost-effective and flexible framework for small organizations.
- Maintenance can be performed and certified by licensed engineers or approved organizations.
- Combines continuing airworthiness and maintenance privileges under one approval if desired.
- Organizations are still subject to CAA oversight but with proportionate requirements.
United States: FAA Part 145 and A&P Mechanics
The FAA manages maintenance oversight through a combination of:
FAA Part 145 Repair Stations
- Mandatory for commercial air carriers and complex aircraft maintenance.
- Includes audit-based oversight and designated Accountable Managers.
- Certifying personnel are typically A&P (Airframe and Powerplant) licensed, with IA (Inspection Authorization) for major tasks.
General Aviation Maintenance
- Independent A&P mechanics can perform maintenance on most GA aircraft without being part of a 145 station.
- Owner-performed maintenance is also permitted for certain tasks (under FAR Part 43 Appendix A).
- This system is more decentralized and mechanic-centric than EASA.
South Africa: SACAA Approvals for All Categories
South Africa follows a dual-track approval system:
- Part 145 under SACAA for large/commercial aircraft maintenance organizations, similar to EASA’s framework.
- Part 44 governs GA and light aircraft maintenance. Here, individual AMEs (Aircraft Maintenance Engineers) certified by SACAA can operate independently or within small approved workshops.
SACAA licensing is influenced by both ICAO and EASA standards, and certification categories reflect airframe, powerplant, and avionics specializations.
Asia: Diverse Approaches to GA and Commercial Maintenance
Asia encompasses a wide regulatory spectrum:
- Singapore (CAAS) and Hong Kong (HKCAD) follow EASA-aligned systems, including GA under simplified arrangements.
- India (DGCA) offers AMO approvals under CAR M and CAR 145, while smaller aircraft may be serviced by DGCA-licensed engineers.
- China (CAAC) enforces a strict oversight regime, particularly for commercial operators, but light aircraft maintenance is beginning to see streamlined approvals, especially in emerging GA markets.
Summary Table: Maintenance Approvals by Aircraft Category and Region
| Region | Commercial / Complex Aircraft | General Aviation Aircraft |
|---|---|---|
| EASA | Part-145 (AMO, Part-66 engineers) | Part-CAO (Combined airworthiness, simpler rules) |
| USA | Part-145 Repair Stations | A&P Mechanics + IA, owner maintenance allowed |
| South Africa | SACAA PArt 145 | SACAA AME licensing, Part 44 workshops |
| Asia (varies) | EASA/FAA-aligned (SG,HK) | Developing frameworks, often national licenses |
Final Thoughts
Understanding maintenance approvals is key to operating and maintaining aircraft safely and legally, regardless of aircraft size or operation type. While EASA’s Part-145 and Part-CAO
provide clear demarcation for complex and general aviation respectively, international frameworks from FAA’s dual mechanic and repair station model to SACAA’s licensing system offer various ways to ensure competent maintenance oversight.
As the general aviation sector grows globally, especially in regions like Africa and Asia, there is an increasing need for clearly defined and scalable maintenance approval systems. Keeping pace with regulatory developments ensures better international cooperation, more efficient operations, and, most importantly, safer skies.
Fun Fact:
The “145” in Part-145 comes from legacy U.S. regulations. It originated in the old Civil Air Regulations and was carried over into FAA and later EASA frameworks making it a globally recognized code for approved maintenance organizations.
