Introduction

In the regulatory landscape of aviation, few frameworks are as fundamental, and as often misunderstood, as Part-M and Part-CAMO. While these terms are frequently referenced in discussions around airworthiness and compliance, their practical roles are not always clearly understood, especially by stakeholders outside of technical departments.

At their core, both Part-M and Part-CAMO form the backbone of continuing airworthiness management, ensuring that aircraft remain safe, compliant, and operational throughout their lifecycle.

Understanding Continuing Airworthiness

Continuing airworthiness refers to the processes required to ensure that an aircraft remains in a condition for safe operation at all times.

This includes:

  • maintenance planning;
  • defect management;
  • compliance with Airworthiness Directives (ADs);
  • monitoring aircraft condition over time.

These responsibilities are defined primarily under Regulation (EU) No 1321/2014, which structures the entire continuing airworthiness framework in Europe.

What is Part-M?

Part-M establishes the regulatory requirements for continuing airworthiness. It defines what must be done to ensure that an aircraft remains compliant and safe throughout its operational life.

This includes:

  • development and management of Aircraft Maintenance Programmes (AMP);
  • requirements for technical records;
  • responsibilities of owners and operators;
  • airworthiness review processes.

In essence, Part-M answers the question: “What needs to be done to keep an aircraft airworthy?”

What is Part-CAMO?

Part-CAMO builds on Part-M by defining the organizational structure responsible for managing these requirements.

A Continuing Airworthiness Management Organisation (CAMO) is responsible for:

  • planning and controlling maintenance activities;
  • ensuring regulatory compliance;
  • managing technical documentation;
  • coordinating with maintenance organisations (Part-145);
  • issuing or recommending Airworthiness Review Certificates (ARC).

Following regulatory updates, Part-CAMO also incorporates Safety Management System (SMS) requirements, further reinforcing its role in proactive safety oversight.

In practical terms, CAMO answers: “Who ensures that airworthiness requirements are properly implemented?”

The Relationship Between Part-M and Part-CAMO

The relationship between the two is complementary:

Part-M defines the rules
Part-CAMO ensures those rules are applied

Operators must either hold a CAMO approval or contract an approved CAMO to manage continuing airworthiness.

This structure ensures that:

  • regulatory requirements are consistently applied;
  • responsibilities are clearly defined;
  • oversight remains independent and structured.

Why This Matters for Operators and Lessors

For operators, understanding Part-M and Part-CAMO is essential for:

  • maintaining operational compliance;
  • avoiding regulatory findings;
  • ensuring safe and efficient fleet management.

For lessors, these frameworks are equally critical:

  • ensuring aircraft are maintained according to approved standards;
  • protecting asset value;
  • enabling smooth transitions between operators.

Without proper CAMO oversight, even well-maintained aircraft can face:

  • documentation gaps;
  • compliance risks;
  • delays during audits or transitions.

A Practical Perspective

In reality, Part-M and Part-CAMO are not just regulatory requirements; they are operational tools.

They provide:

  • structure to maintenance planning;
  • transparency in aircraft condition;
  • traceability across the aircraft lifecycle;
  • confidence for stakeholders.

When properly implemented, they transform airworthiness management from a compliance obligation into a strategic advantage.

Conclusion

Understanding Part-M and Part-CAMO is essential for anyone involved in aviation operations, asset management, or regulatory oversight. Together, they define not only how aircraft are maintained, but how safety, compliance, and operational efficiency are sustained over time.

At Arpiem, we support operators and lessors through structured CAMO services, ensuring that regulatory requirements are translated into practical, effective airworthiness management.