Module 10: Aviation Legislation — Category B1.2 Study Material

1. Overview of Module 10

Module 10 is a mandatory theoretical module within the EASA Part-66 basic knowledge syllabus (Appendix I to Regulation (EU) No 1321/2014, Annex III). It provides certifying staff with a comprehensive understanding of the legal and regulatory framework governing civil aviation maintenance within the European Union. The module is designed to ensure that certifying staff are not only technically proficient but also legally aware, understanding their obligations, privileges, and the limits of their authority.

For a Category B1.2 licence (aeroplane with piston engines), Module 10 covers the entire regulatory ecosystem, from the overarching European Union regulations to the specific annexes that govern continuing airworthiness (Part-M), maintenance organisations (Part-145), certifying staff (Part-66), and training organisations (Part-147). The module also introduces the initial airworthiness requirements (Part-21) and the role of Acceptable Means of Compliance (AMC) and Guidance Material (GM).

The knowledge level required for Module 10 is typically Level 2 (general knowledge) for most topics, with some areas requiring Level 3 (detailed theory) where the certifying staff's direct responsibilities are concerned. This study material focuses on the core legal principles, the hierarchy of regulations, and the specific duties and privileges of B1.2 certifying staff.

2. The Regulatory Framework: Regulation (EU) No 1321/2014

The central piece of legislation for continuing airworthiness is Commission Regulation (EU) No 1321/2014. This regulation establishes the technical requirements and administrative procedures for the continuing airworthiness of aircraft, including the organisations and personnel involved. It is structured into four annexes, each of which is a self-contained set of requirements:

Annex I (Part-M): Requirements for the continuing airworthiness management of aircraft, including the responsibilities of owners, operators, and Continuing Airworthiness Management Organisations (CAMOs). It also covers the airworthiness review process and the issuance of Airworthiness Review Certificates (ARCs).
Annex II (Part-145): Requirements for maintenance organisations. It details the approvals, procedures, quality systems, and personnel requirements for organisations that perform maintenance on aircraft and components.
Annex III (Part-66): Requirements for the certification of certifying staff. It defines the licence categories, eligibility criteria, privileges, and the conditions for the validity and continuation of the licence.
Annex IV (Part-147): Requirements for training organisations. It specifies the conditions under which an organisation can provide the basic training and type training required for the issuance of a Part-66 licence.

Key Concept: Understanding which annex applies to which activity is fundamental. For example, a B1.2 certifying staff member works under the privileges granted by Part-66, but their day-to-day activities are governed by the procedures of the Part-145 organisation that employs them. The aircraft they work on must be managed under Part-M.

3. The Part-66 Aircraft Maintenance Licence (AML)

3.1 Licence Categories and Scope

Part-66 defines several licence categories, each with a specific scope of privileges. The categories relevant to this module are:

Category B1: Certifying staff for aeroplane airframe, engine, and mechanical and electrical systems. This category is subdivided by engine type:
B1.1: Aeroplanes with turbine engines.
B1.2: Aeroplanes with piston engines.
Category B2: Certifying staff for avionic systems, including communication, navigation, and instrumentation.
Category B3: Certifying staff for non-pressurised aeroplanes with a Maximum Take-off Mass (MTOM) of 2000 kg or less, using piston engines.

Critical Distinction for B1.2: The B1.2 category is strictly limited to aeroplanes with piston engines. A B1.2 licence does not grant privileges to certify maintenance on turbine-engine aeroplanes, regardless of any additional training or type ratings held. The category is determined by the engine type, not the airframe. This is a core principle of Part-66.A.20.

3.2 Eligibility Requirements for Licence Issuance

To be eligible for the issuance of a Part-66 AML, an applicant must meet several fundamental requirements as defined in Part-66.A.30:

Minimum Age: The applicant must be at least 18 years of age. This is a non-negotiable legal requirement for all licence categories, including B1.2.
Basic Knowledge: The applicant must have passed the module examinations as defined in Appendix I to Part-66. For a B1.2 licence, this includes all modules from 1 to 17, with Module 10 (Aviation Legislation) being a mandatory component. The pass mark for each module is 75%.
Practical Experience: The applicant must have completed a period of practical maintenance experience. The standard requirement is 3 years of practical experience. This can be reduced to 2 years if the applicant has completed a Part-147 approved training course. The experience must be relevant to the licence category sought.
Assessment of Competence: The applicant must have demonstrated the practical ability to perform maintenance tasks. This is typically assessed through a practical assessment within a Part-147 training environment or as part of the experience requirement.

3.3 Licence Validity and Recent Experience

A fundamental aspect of the Part-66 licence is its validity. The licence, once issued, is valid for life and does not have a specific expiry date. It is not subject to periodic renewal. However, the privileges to exercise the licence are conditional and can be suspended.

To exercise certification privileges, the holder must meet the recent experience requirement. Part-66.A.20(e) states that the holder must have:

6 months of actual maintenance experience in the preceding 2-year period.

This experience must be relevant to the licence category. If a certifying staff member has not met this requirement, their privileges are suspended until they either:

Complete relevant refresher training, or
Pass a relevant examination.

Important Note: The licence itself remains valid, but the holder cannot sign a Certificate of Release to Service (CRS) until the recent experience requirement is re-established.

3.4 Type Ratings and Endorsements

A B1.2 licence is not a blanket authorisation to certify any piston-engine aeroplane. It must be endorsed with type ratings for specific aeroplane types. Part-66.A.45 specifies that to add a type rating, the applicant must:

Complete a type training course that meets the requirements of Part-147 (or an equivalent as defined in Part-66).
Pass the associated theoretical and practical examinations.

Differences Training: If an aeroplane model is similar to one already on the licence, but not identical, differences training may be sufficient to extend the rating. However, this is only permitted within the same type rating group as defined by the Agency. A different model that is not covered by the type rating group requires a full new type rating via Part-147 training.

Legal Consequence: Certifying staff must hold the appropriate type rating for the specific aeroplane type they are certifying. Without it, they are not authorised to certify maintenance on that type, even if they hold a B1.2 licence. They may only work under the supervision of a certifying engineer who holds the appropriate type rating.

4. Privileges and Responsibilities of B1.2 Certifying Staff

4.1 Certification Privileges (Part-66.A.20)

The primary privilege of a B1.2 licence is the ability to certify the release to service of an aeroplane after maintenance. This includes:

Airframe maintenance: Structural repairs, inspections, and modifications.
Powerplant maintenance: Work on piston engines, including components and systems.
Mechanical and Electrical Systems: Maintenance of systems such as landing gear, flight controls, hydraulic systems, and electrical generation/distribution.
Limited Avionic Tasks: The B1 syllabus includes a defined scope of avionic tasks that a B1 licence holder may certify. This is limited to tasks that are directly related to the mechanical and electrical systems, such as simple fault diagnosis and rectification of avionic systems that are within the B1 syllabus. Complex avionic system modifications or repairs are not within B1 privileges and require a B2 licence.

Critical Rule: Certifying staff must never certify work outside the scope of their licence privileges. If a task is not covered by the B1.2 scope, the certifying staff member must refuse the task and escalate it through the organisation's procedures.

4.2 The Certificate of Release to Service (CRS)

The CRS is the formal document that certifies that maintenance has been performed correctly and that the aircraft is fit for safe operation. Under Part-145.A.50, a CRS must be issued by certifying staff after the completion of any maintenance.

Key Requirements for Issuing a CRS:

All required maintenance must have been completed in accordance with approved data.
All work must be properly documented, with work cards signed by the individuals who performed the tasks.
The certifying staff member must be fully aware of the work performed. This can be achieved through personal inspection or through the input of other personnel under their supervision and control.
The certifying staff member must be satisfied that the aircraft is airworthy.

Important Distinction: The CRS is for the whole aircraft. An EASA Form 1 is used to certify individual components. An Airworthiness Review Certificate (ARC) is issued after an airworthiness review, not after maintenance.

4.3 Responsibilities Regarding Defects and Airworthiness

Part-M.A.401 and Part-145.A.50 place a clear responsibility on certifying staff to ensure that any defect that affects the safe operation of the aircraft is rectified before a CRS is issued.

Scenario: If a certifying staff member finds a chafed hydraulic hose that is not due for replacement per the AMM, they must assess the actual condition. If the chafing could lead to hose failure, it is a safety hazard and must be rectified, regardless of the scheduled replacement interval. The AMM interval is a minimum requirement, but the certifying staff must use their judgement to ensure the aircraft is airworthy.

Deferring Defects: Deferring a safety-critical defect is not permitted unless it is explicitly allowed by the Minimum Equipment List (MEL) or Configuration Deviation List (CDL) and does not affect the airworthiness of the aircraft.

4.4 Handling Non-Compliant Data or Procedures

Part-145.A.45 requires that maintenance is performed using approved data. This typically includes the Aircraft Maintenance Manual (AMM), Component Maintenance Manuals (CMMs), and other manufacturer documentation.

If the AMM is outdated or contains an error: The maintenance organisation must resolve the issue with the data provider (e.g., the type certificate holder) before proceeding. Certifying staff must not use incorrect data or make unilateral corrections.
If a defect is not covered by the approved data: The maintenance organisation must obtain approved repair data from the type certificate holder or a design organisation, per Part-21.A.433. This is the only compliant path forward.

4.5 The Role of the Certifying Staff in the Maintenance Process

Part-145.A.40 (Certification of maintenance) requires that before issuing a CRS, the certifying staff must ensure that all required maintenance has been properly carried out. This includes being fully aware of the work performed. The certifying staff member must have sufficient knowledge of the work to accept responsibility.

Scenario: If a certifying staff member personally performed one task (e.g., cylinder replacement) but the final inspection of the engine bay was carried out by another mechanic who is not authorised as certifying staff, the certifying staff member must verify the work. This can be done by personal inspection or by using the input of other personnel who are under their supervision and control. The other mechanic does not need to be certifying staff, but must be competent and under the certifying staff's supervision.

5. The Role of Part-M and the Continuing Airworthiness Management Organisation (CAMO)

Part-M (Annex I to Regulation (EU) No 1321/2014) sets out the requirements for the continuing airworthiness of aircraft. It defines the responsibilities of the owner/operator and the CAMO.

5.1 Owner/Operator Responsibilities (Part-M.A.801)

The owner or operator of an aircraft is responsible for ensuring that maintenance is carried out in accordance with the approved maintenance programme. This is a fundamental responsibility. The certifying staff are responsible for the certification of the maintenance performed, but the overall responsibility for ensuring the maintenance programme is followed rests with the owner/operator.

5.2 The Maintenance Programme (Part-M.A.302)

The maintenance programme is a document that specifies the scheduled maintenance tasks and their intervals. The CAMO is responsible for managing the maintenance programme, including its review and update, to ensure it remains current and effective. This includes reflecting changes in the aircraft's usage or applicable Airworthiness Directives. Certifying staff perform the maintenance but do not manage the programme.

5.3 The Airworthiness Review Certificate (ARC)

The ARC is issued after an airworthiness review, which is a comprehensive inspection of the aircraft and its records to ensure it is airworthy. Part-M.A.305 and Appendix II to Part-M specify the minimum content of the ARC, which includes:

Aircraft identification: Registration, type, and serial number.
Validity dates: The period for which the ARC is valid.

The name of the certifying staff, hours/cycles, and deferred defects are not mandatory elements of the ARC.

6. The Role of Part-145 and the Maintenance Organisation

Part-145 (Annex II to Regulation (EU) No 1321/2014) sets out the requirements for maintenance organisations. It covers the approval process, the quality system, and the personnel requirements.

6.1 Approved Data (Part-145.A.45)

Maintenance must be performed using applicable maintenance data. This is a core requirement. The certifying staff must use the AMM, CMM, and other manufacturer documentation as the primary reference for approved data.

6.2 Certification of Maintenance (Part-145.A.50)

The CRS must be issued by certifying staff after the completion of any maintenance. The certifying staff must ensure that all required maintenance has been completed and that the aircraft is airworthy.

6.3 The Role of the Quality Manager

If a certifying staff member discovers a discrepancy, such as an AD that has not been embodied, they must report the discrepancy through the organisation's procedures to the quality manager. Direct notification to the competent authority is not the first step; the organisation's reporting chain applies.

7. The Role of Part-147 and Training Organisations

Part-147 (Annex IV to Regulation (EU) No 1321/2014) sets out the requirements for organisations providing training and examinations for the issue of Part-66 licences. It ensures that the training meets the syllabus and quality standards, and that examinations are properly conducted. A Part-147 approved training organisation is the standard route for completing the basic knowledge and type training required for a Part-66 licence.

8. The Role of Part-21 and Airworthiness Directives

Part-21 (Regulation (EU) No 748/2012) covers the initial airworthiness of aircraft and components. It is relevant to certifying staff because it defines the process for issuing Airworthiness Directives (ADs) .

An AD is issued by EASA to require actions to correct an unsafe condition. Compliance with ADs is mandatory and is a critical part of continuing airworthiness. Certifying staff must ensure that all applicable ADs are embodied before issuing a CRS. If an AD is not embodied, the aircraft is not airworthy, and the CRS must be withheld.

9. Acceptable Means of Compliance (AMC) and Guidance Material (GM)

EASA issues AMC and GM to provide practical guidance on how to comply with the basic regulation and its annexes. They are not legally binding in themselves, but following them ensures compliance. Alternative means of compliance can be used if the competent authority approves them.

Key Concept: AMC and GM are essential for understanding the intent of the regulations. They provide detailed examples and best practices that help certifying staff interpret the requirements of Part-66, Part-145, and Part-M.

10. Common Relationships Between Concepts

Part-66 and Part-145: A Part-66 licence grants the individual privileges, but these privileges can only be exercised within the framework of a Part-145 approved maintenance organisation. The organisation's procedures and quality system govern how the certifying staff member operates.
Part-M and Part-145: Part-M defines the overall continuing airworthiness management, including the maintenance programme. Part-145 defines how the maintenance is performed and certified. The CAMO (Part-M) is responsible for ensuring the maintenance is scheduled, while the Part-145 organisation is responsible for performing it.
Part-66 and Part-147: Part-147 provides the training and examinations that are a prerequisite for the Part-66 licence. The type ratings on a Part-66 licence are obtained through Part-147 type training.
Part-21 and Part-145: Part-21 defines the initial airworthiness standards and the process for issuing ADs. Part-145 requires that maintenance is performed using approved data, which includes compliance with ADs.

11. Typical Exam Focus Points

The Module 10 examination for B1.2 focuses on the legal and regulatory knowledge required for safe and compliant practice. Key areas of focus include:

Licence Eligibility: The minimum age (18 years), experience requirements (3 years, or 2 with Part-147 training), and the mandatory module examinations.
Licence Validity: The licence is valid for life, but recent experience (6 months in 2 years) is required to exercise privileges.
Type Ratings: The requirement to hold the specific type rating for the aeroplane type being certified. Differences training is only valid within a type rating group.
Scope of Privileges: The B1.2 licence covers piston-engine aeroplanes only. It does not cover turbine-engine aeroplanes. Avionic tasks are limited to those specified in the B1 syllabus.
CRS Issuance: The conditions under which a CRS can be issued, including the requirement for all work to be completed, documented, and verified.
Defect Handling: The responsibility to rectify safety-critical defects before release, and the correct procedure for handling defects not covered by approved data.
AD Compliance: The mandatory nature of ADs and the requirement to verify compliance before issuing a CRS.
Regulatory Hierarchy: The structure of Regulation (EU) No 1321/2014, including the annexes (Part-M, Part-145, Part-66, Part-147).
AMC and GM: The legal status of AMC and GM as non-binding but compliant means of meeting regulatory requirements.
Documentation: The correct use of the AMM, CMM, and other approved data, and the distinction between a CRS, EASA Form 1, and ARC.

12. Conclusion

Module 10 equips the B1.2 certifying staff member with the legal knowledge to act responsibly and within their authority. The key takeaway is that certification is not just a technical act but a legal one. The certifying staff member must understand the regulatory framework, their privileges and limitations, and their responsibilities to ensure the continuing airworthiness of the aircraft. By mastering this module, the certifying staff member becomes a fully compliant and effective professional within the EASA system.