The cornerstone of aeronautical maintenance

An AMO (Approved Maintenance Organization), also known in the United States as a Repair Station under the FAA (Federal Aviation Administration) FAR Part 145, is an organization authorized by the competent authority to perform maintenance, repair and overhaul (MRO) tasks on aircraft, engines, components and systems. Their role is essential to guarantee the continued airworthiness and safety of operations.

International certification: EASA Part-145 and FAA Part 145

In Europe, an AMO operates under Regulation (EU) 1321/2014, specifically under Part-145, while in the United States, Repair Stations are regulated by FAR Part 145. Both regulations share key principles:

• Certified personnel (EASA Part-66 / FAA A&P Mechanics or Repairmen)
• Tool Control and Calibration Procedures
• Traceability of components and technical documentation
• Quality, safety and continuing education requirements

What tasks does an AMO/Repair Station perform?

1. Scheduled Maintenance

It performs inspections such as A-Check, C-Check, and D-Check following the requirements of the manufacturer (OEM) and the authority-approved maintenance program.

2. Unscheduled maintenance

Responds to failures, flight discrepancies, or structural damage. It may involve part replacement, functional testing, or rapid on-ramp diagnostics.

3. Modifications and compliance with directives

Implements Service Bulletins (SB) and Airworthiness Directives (AD) issued by OEMs or authorities such as the FAA or EASA.

4. Non-destructive testing (NDT)

It uses techniques such as ultrasound, magnetic particles, or penetrating liquids to detect cracks or defects without disassembly.

5. Management of Rotating Parts and Components

It includes the traceability, repair, inspection and recertification of elements such as landing gear, generators, actuators or valves.

Who makes up an AMO?

An AMO / Repair Station integrates a highly qualified and regulated technical team:

• Part-66 Technicians (EASA) / A&P Mechanics (FAA)
• B1 (mechanic), B2 (avionics) and level C (responsible supervisor)
• NDT technicians certified under NAS410 / EN4179
• Quality staff, technical warehouse and calibration

Each intervention is documented, signed by authorized personnel and supported by auditable procedures.

The importance of logistical and tool support

The quality of maintenance also depends on the tools used. In this context, EGA Master offers:

• ATA Chapter kits (e.g. ATA 28 – fuel, ATA 32 – landing gear)
• Bi-color trays with anti-FOD visual control
• Laser marking and traceability by station or technician
• Part 145 / FAR 145 compatibility and calibration documentation

More than a workshop, a regulated organization

An AMO or Repair Station is much more than a maintenance center: it is a technical, legally certified, audited and specialized organization. Each tool, each component, each signature on a work report, responds to international standards.

Because in aviation, maintenance is not simply about repairing: it is about certifying, tracking and guaranteeing safety with documentary and technical precision.