Part-66 Module Examinations

What are module examinations?

EASA Part-66 divides the theoretical knowledge required for an Aircraft Maintenance Licence into a set of numbered modules. Each module corresponds to a distinct subject area — from mathematics, physics, and electrical fundamentals through to aircraft structures, powerplant systems, and avionics. To obtain an AML, a candidate must demonstrate competence across all modules applicable to the licence category they are seeking.

A module examination is the formal written assessment administered at the end of each subject. Under Part-66, these examinations must be conducted by, or under the authority of, the competent national aviation authority — unless the examination is carried out by an approved Part-147 maintenance training organisation. TRITECH holds a Part-147 approval that includes examination authority. This means candidates complete their examinations directly at TRITECH's facilities in Riga, under TRITECH's own invigilated and regulated examination process. There is no need to register with, travel to, or wait for an available slot at a separate examination body.

Upon passing each module examination, TRITECH issues a Certificate of Recognition (CofR). This is the official document that records the candidate's attainment and is subsequently submitted to the national civil aviation authority as evidence of theoretical knowledge compliance when applying for the AML.

The modules at a glance

The full set of Part-66 modules covers a broad technical curriculum. The specific modules required depend on the licence category being sought. For a B1.1 (turbine aeroplanes) licence — the most common commercial target — all 17 modules are examined. The subjects range from foundational science through to aircraft-specific systems:

Module	Subject	B1	B2
01	Mathematics	Yes	Yes
02	Physics	Yes	Yes
03	Electrical Fundamentals	Yes	Yes
04	Electronic Fundamentals	Yes	Yes
05	Digital Techniques & Electronic Instrument Systems	Yes	Yes
06	Materials and Hardware	Yes	Yes
07	Maintenance Practices	Yes	Yes
08	Basic Aerodynamics	Yes	Yes
09	Human Factors	Yes	Yes
10	Aviation Legislation	Yes	Yes
11A	Turbine Aeroplane Aerodynamics, Structures & Systems	Yes	—
11B	Piston Aeroplane Aerodynamics, Structures & Systems	Sub-cat only	—
12	Helicopter Aerodynamics, Structures & Systems	Sub-cat only	—
13	Aircraft Aerodynamics, Structures & Systems (B2)	—	Yes
14	Propulsion (B2)	—	Yes
15	Gas Turbine Engine	Yes	—
16	Piston Engine	Sub-cat only	—
17	Propeller	Yes	—

Module 11A is the largest single module in the B1.1 curriculum and covers the full scope of turbine transport-category aeroplane systems in considerable depth — structures, hydraulics, fuel, pressurisation, ice protection, electrical generation, flight controls, and more. TRITECH's instruction programme allocates substantial classroom and workshop time to this module to reflect its weight in the overall curriculum and its direct relevance to daily maintenance work.

How it works at TRITECH

TRITECH delivers module instruction on a structured schedule. Each module is taught as a dedicated study block, combining classroom theory with practical demonstrations and workshop exercises where the subject matter requires it. Candidates attend instruction for the full duration of the module's scheduled hours before sitting the examination.

The examination itself is conducted under formal invigilation at TRITECH's Riga facility. The format follows the Part-66 standard: multiple-choice questions with answer options drawn from the examination specifications published in EASA AMC 66.A.25. Examinations are timed and conducted in a controlled environment. Pass marks follow the Part-66 minimums — 75% for most modules. Candidates who do not achieve the pass mark on a first attempt are permitted to resit after a mandatory waiting period in accordance with Part-66 rules.

Once a module is passed, TRITECH issues the Certificate of Recognition for that module. CofRs accumulate throughout the programme — each passed module adds a document to the candidate's growing evidence package. When all required modules are complete, the full set of CofRs is submitted to the Civil Aviation Authority of Latvia (or the candidate's home authority) as part of the AML application. The authority reviews the CofRs alongside the experience and training documentation, and issues the licence once all requirements are satisfied.

Who should take this route?

The module examination route is designed to be accessible. EASA Part-66 does not require a prior engineering degree or any specific academic background beyond general secondary education. The following groups are well-suited to this pathway:

• High school graduates entering directly. Candidates who have completed secondary education and wish to qualify as AMEs without first completing a university degree. The module programme provides all the theoretical knowledge required for the AML — no additional academic qualification is needed.
• Professionals from adjacent technical fields. Engineers, technicians, and tradespeople from mechanical, electrical, or aerospace-adjacent backgrounds who are looking to transition into aircraft maintenance. Candidates with an engineering background often find that several foundational modules (mathematics, physics, electrical fundamentals) are straightforward, allowing focus on the aviation-specific content.
• Military aviation personnel. Former military aircraft technicians who have significant practical experience but whose military qualifications are not directly recognised under the EASA civilian framework. Module examinations allow them to convert their knowledge into the formal evidence package required for an AML.
• Airport and ground handling personnel. Those already working in aviation support roles — ramp agents, ground engineers, marshalling personnel — who have proximity to aircraft and a working understanding of airline operations, and who wish to formalise and advance their qualifications.
• Career changers from non-aviation backgrounds. Individuals making a deliberate career change who are attracted by the combination of technical challenge, strong employment prospects, and job security that the AME profession offers. No prior aviation background is required to begin.
• Candidates who have passed some modules elsewhere. Part-66 CofRs issued by other competent authorities or Part-147 organisations are generally portable. Candidates who have already passed certain modules at another approved organisation can often credit those results and sit only the remaining modules at TRITECH, subject to validity rules under Part-66. Contact TRITECH to discuss your specific situation.

After the modules

Completing all required module examinations and accumulating the corresponding Certificates of Recognition satisfies the theoretical knowledge requirement of Part-66. It is one of three pillars required for AML issuance — the others being practical experience and, where applicable, approved basic training hours.

Once theoretical knowledge is demonstrated, candidates move into the experience phase: a minimum of two years of documented on-the-job maintenance experience gained under a Part-145 approved organisation. During this period, candidates work alongside licensed engineers on live commercial aircraft, building the practical competence that the examinations cannot replicate. The experience must be logged, verified by the Part-145 organisation's Quality department, and submitted to the authority as part of the licence application.

Many candidates also complete a type rating course either during or immediately after the experience phase. A type rating endorsement — for example, on the Airbus A320 family or Boeing 737 NG — specifies the aircraft on which the engineer can exercise independent certifying authority. Without an endorsed type rating, the AML is issued but the engineer cannot sign maintenance releases independently on any specific type. TRITECH delivers approved type rating training for five major aircraft types.

For a complete picture of the full licensing sequence — from first module through to type-rated AML — see the EASA Licensing Path overview.