Module 10: Aviation Legislation (EASA-B2)

1. Module Overview

Module 10 of the EASA Part-66 syllabus provides the regulatory framework that governs the certification, maintenance, and continuing airworthiness of aircraft within the European Union. For a Category B2 certifying staff member (avionics/electrical systems), this module is essential for understanding the legal boundaries of their privileges, their obligations to the competent authority, and the operational rules that ensure flight safety.

This module synthesises the key regulations contained within Regulation (EU) No 1321/2014, which is the consolidated regulation for continuing airworthiness. It focuses on the interaction between the four primary Annexes: Part-66 (Certifying Staff), Part-145 (Maintenance Organisations), Part-M (Continuing Airworthiness), and Part-147 (Training Organisations). The content is structured to provide a detailed understanding of the legal duties, limitations, and procedures that govern the daily work of a B2 certifying staff member.

2. Key Concepts Explained in Detail

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

This is the foundational legal text. It is not a single rule but a collection of essential Annexes that govern the entire maintenance ecosystem.

Part-66 (Annex III): Governs the certification of aircraft maintenance personnel. It defines licence categories, eligibility, privileges, and the requirements for licence validity.
Part-145 (Annex II): Governs the approval of maintenance organisations. It sets the requirements for facilities, personnel, procedures, and quality systems that an organisation must meet to perform maintenance.
Part-M (Annex I): Governs the continuing airworthiness of aircraft. It defines the responsibilities of owners, operators, and Continuing Airworthiness Management Organisations (CAMOs).
Part-147 (Annex IV): Governs the approval of maintenance training organisations. It sets the standards for basic and type training courses.

Key Relationship: A B2 certifying staff member operates within a Part-145 organisation. Their individual authority comes from their Part-66 licence, but their actions are constrained and enabled by the Part-145 organisation's approval. The overall airworthiness of the aircraft is managed by the CAMO under Part-M.

2.2 The Part-66 Aircraft Maintenance Licence (AML)

The AML is the personal, legal authorisation for a certifying staff member to certify maintenance. It is issued by the competent authority of an EASA Member State.

Validity: The licence is issued with unlimited validity. It does not require periodic renewal. However, it can be revoked, suspended, or limited by the competent authority if the holder fails to meet the required standards (Part-66.A.20).
Basic Eligibility Requirements (Part-66.A.30):
Minimum Age: The applicant must be at least 18 years of age.
Basic Knowledge: The applicant must have passed the required module examinations as defined in Appendix I of Part-66.
Practical Experience: The applicant must have completed the required practical maintenance experience as defined in Appendix IV of Part-66.
Practical Experience Requirements (B2):
Standard Route: 5 years of practical maintenance experience on operating aircraft.
Reduced Route: If the applicant has completed an approved Part-147 basic training course, the experience requirement is reduced to 2 years. This is a reduction of 60% from the standard 5-year requirement.
Note on Reduction: The reduction is a specific allowance in Part-66, Appendix III. It is not a general "up to 50%" rule; the specific reduction for B2 with a Part-147 course is to 2 years.

2.3 B2 Licence Privileges and Limitations

The B2 licence is a category-specific authorisation. It is crucial to understand its exact scope.

Scope of Work: A B2 licence authorises the holder to certify maintenance on avionic and electrical systems.
Certification Privileges (Part-66.A.20): The B2 holder can issue a Certificate of Release to Service (CRS) for work performed on these systems. This includes tasks such as:
Troubleshooting, testing, and repairing avionics LRUs (e.g., VHF transceivers, flight management computers, inertial reference systems).
Electrical system maintenance, including wiring, power distribution, and electrical load analysis.
Modifications to avionic and electrical systems.
Critical Limitation: A B2 licence does not authorise certification of mechanical or structural work. That is the domain of the B1 licence. Conversely, a B1 licence does not cover avionics. A B2 certifying staff member cannot sign for mechanical work, and a B1 cannot sign for avionics work, even if they are supervising the task.

2.4 Type Ratings and Certification Privileges

A basic B2 licence is not sufficient to certify maintenance on a specific aircraft type. The holder must have the appropriate type rating endorsed on their licence.

Requirement (Part-66.A.45): To exercise certification privileges on a specific aircraft type, the certifying staff must have completed approved type training for that aircraft. This training must be conducted by a Part-147 organisation with type training approval or be otherwise accepted by the competent authority.
Type Rating Scope: The type rating covers a specific aircraft model and its associated systems. If a major modification changes the avionics configuration (e.g., a new avionics suite), the existing type rating may not cover the new configuration. The licence holder must undergo additional training and have the rating extended.
Consequence of No Type Rating: Without a type rating, the certifying staff cannot issue a CRS for that aircraft type, regardless of their experience or training.

2.5 Continued Validity of the Licence

While the licence does not expire, its validity is conditional on the holder maintaining their competence.

Recent Experience Requirement (Part-66.A.20(e)): To remain valid, the licence holder must have 6 months of practical maintenance experience in the preceding 2 years.
Consequence of Non-Compliance: If this requirement is not met, the licence becomes invalid. The holder cannot exercise certification privileges. To regain validity, they must complete refresher training and pass an examination, as required by the competent authority. The licence is not automatically revoked, but it is suspended until the requirements are met.

2.6 The Role of the Certifying Staff Member

The certifying staff member is the final gatekeeper for airworthiness. Their responsibilities are defined by Part-66 and Part-145.

Issuing the CRS (Part-145.A.50): The CRS is a formal document attesting that maintenance has been performed correctly and in accordance with approved data. It is issued by certifying staff authorised by the Part-145 organisation and holding the appropriate Part-66 licence and type rating.
Ensuring Compliance with Approved Data (Part-145.A.45): This is a core duty. The certifying staff must ensure that all maintenance is performed using the current and applicable data. This includes:
Aircraft Maintenance Manuals (AMM) and Component Maintenance Manuals (CMM) – current revision only.
Service Bulletins (SBs) – only if they are incorporated into approved data (e.g., via an Airworthiness Directive or a modification approval). A standalone SB is not approved data.
Supplemental Type Certificates (STCs) – these are approved data under Part-21 and provide the basis for certification of modifications.
Reporting Findings (Part-145.A.60): If a certifying staff member discovers a condition that affects the safety of the aircraft (e.g., an undocumented modification, a defect, or damage), they have an immediate obligation to report it to the accountable manager of their organisation. The organisation is then responsible for notifying the competent authority as per the occurrence reporting scheme.

3. Important Procedures and Regulations

3.1 The Certificate of Release to Service (CRS)

Purpose: The CRS is the formal declaration that all maintenance tasks have been completed satisfactorily and the aircraft or component is ready for service.
Authorisation: It can only be signed by certifying staff who are:

Authorised by the Part-145 organisation.
Hold a valid Part-66 licence with the appropriate category (B2 for avionics).
Hold the appropriate type rating for the aircraft.

Conditions for Issuance: A CRS can only be issued when:
All required maintenance has been completed.
All work has been performed using approved data.
All maintenance records are complete and accurate, including test results.
No known defects are present that would affect airworthiness.

3.2 Handling Incomplete or Non-Compliant Work

Incomplete Scheduled Tasks: If a required task from the approved maintenance programme cannot be completed (e.g., due to missing test equipment), the aircraft cannot be released to service. A formal deferral is only possible if it is allowed by the approved maintenance programme or the operator's MEL (Minimum Equipment List), which is an operational document.
Undocumented Modifications: If an undocumented modification is found, it is a safety issue. The certifying staff must immediately report it to the organisation, which must then notify the competent authority. The aircraft cannot be released until the modification is assessed and either accepted or rectified.
Non-Reproducible Defects: If a reported defect cannot be reproduced during a functional test, the certifying staff must document the findings and actions taken in the logbook. This provides traceability for the operator to decide on further action.

3.3 Data Control and Availability

Current Data: Maintenance must be performed using the current revision of the applicable data. Using an outdated revision is a violation of Part-145.A.45, as it may contain incorrect procedures or miss critical safety information.
Alternative Parts: If a component is replaced with an alternative part number, the certifying staff must ensure that the applicable data (e.g., the CMM for that alternative part) is available. If the data is not available, the installation is not in accordance with approved data, and the part cannot be installed.

3.4 Environmental and Facility Requirements

Suitable Environment (Part-145.A.25): Maintenance must be performed in a suitable environment. This includes adequate facilities and protection from adverse weather. Performing a functional test in heavy rain or strong winds is not acceptable, as it could lead to erroneous results or damage to equipment.

4. Common Relationships Between Concepts

Part-66 Licence ↔ Part-145 Organisation: The licence is personal, but its privileges are exercised within the scope of an approved organisation. The organisation's capability list must include the work being performed. A B2 licence does not authorise an organisation to perform work outside its approval scope.
Type Rating ↔ Aircraft Configuration: The type rating is linked to a specific aircraft configuration. A major modification to the avionics suite may invalidate the rating, requiring additional training.
Approved Data ↔ CRS: The CRS is only valid if the work was performed using approved data. The source of the data (AMM, CMM, STC, AD) determines its legal status.
Maintenance Programme ↔ AMM: The operator's maintenance programme is the controlling document for scheduled maintenance. It may have intervals that differ from the AMM, provided they are substantiated and approved by the competent authority under Part-M.A.302.
Recent Experience ↔ Licence Validity: The licence is valid indefinitely, but its validity is conditional on the holder meeting the recent experience requirements.

5. Typical Exam Focus Points

Minimum Age: The absolute requirement of 18 years for licence issuance.
Licence Validity: The distinction between "unlimited validity" and "conditional validity" based on recent experience.
Experience Requirements: The exact reduction in practical experience for B2 with a Part-147 course (5 years to 2 years).
Scope of B2 Privileges: The clear boundary between avionics/electrical (B2) and mechanical/structural (B1) work.
Type Rating Necessity: The absolute requirement for a type rating to certify maintenance on a specific aircraft.
Approved Data: The strict definition of what constitutes approved data (AMM, CMM, AD, STC) and the exclusion of standalone SBs.
CRS Conditions: The conditions that must be met before a CRS can be issued, including complete documentation and the use of current data.
Reporting Obligations: The immediate obligation to report safety-critical findings to the accountable manager.
Organisational Scope: The limitation that an individual's licence does not override the organisation's approval scope.
Regulatory Source: The primary legal basis is Regulation (EU) No 1321/2014, which contains Part-66, Part-145, Part-M, and Part-147.