Aviation Training Glossary

The person within a Part 147 MTO who has corporate authority to ensure that all training and examinations can be financed and carried out to the required standard. The Accountable Manager is the primary point of contact with the NAA and must be named in the MTOE.

Non-binding standards published by EASA that describe acceptable methods for demonstrating compliance with the regulations. MTOs are not required to follow AMC exactly, but doing so creates a presumption of compliance.

A cloud-hosted training management platform built specifically for EASA Part 147 maintenance training organisations. Developed by Aggregator Solutions. View all AMTOS features →

The minimum percentage of scheduled training hours a student must attend before being eligible to sit examinations or receive a Certificate of Recognition. Defined in the MTO's approved training programme within the MTOE.

Training delivered by a Part 147 MTO covering the theoretical knowledge and practical skills required for a Part 66 aircraft maintenance licence. Basic training follows the Part 66 module syllabus and concludes with examinations and practical assessments. Read: What is EASA Part 147? →

A visual reporting interface that provides real-time operational metrics. In a Part 147 context, BI dashboards typically show KPIs such as pass rates by module, attendance trends, student progression, and examination statistics.

An organisation approved under EASA Part M (or Part CAMO) to manage the continuing airworthiness of aircraft. Not directly related to Part 147 training but sometimes relevant where an MTO is co-located with a CAMO.

A document issued by a Part 147 MTO using EASA Form 148, certifying that a student has successfully completed an approved basic training course — including all examinations, attendance requirements, and practical assessments. The CoR is a prerequisite for applying for a Part 66 licence. Read: CoR Guide →

Training provided to ensure that instructors and examiners maintain their knowledge and competency. Part 147 requires that instructor continuation training is conducted at defined intervals and documented.

A statistical measure used in question bank management to assess how well an exam question differentiates between high-performing and low-performing students. A high discrimination index indicates a well-crafted question. Read: Managing Question Banks →

A statistical measure indicating the proportion of students who answered a question correctly. Used in question bank analysis to identify questions that are too easy, too difficult, or appropriately challenging.

The EU agency responsible for civil aviation safety in Europe. EASA develops the regulations (including Part 147 and Part 66) that govern maintenance training organisations and aircraft maintenance licences.

The standardised document format for the Certificate of Recognition. Form 148 specifies the required content including the MTO's approval reference, student details, category of training, and module examination results. Read: CoR Guide →

A person formally authorised by a Part 147 MTO to conduct and mark examinations. Examiners must hold appropriate qualifications and their authorisation must be current. Examiner records are a common audit focus.

See EASA Form 148.

A systematic review conducted by the MTO's own quality team to assess compliance with the MTOE and regulatory requirements. Part 147 requires that internal audits cover all areas of the organisation at defined intervals. Findings must be documented with corrective actions. Read: Audit Checklist →

Statistical analysis of examination question performance. Includes metrics such as difficulty index, discrimination index, and distractor effectiveness. Used to identify and retire poor-performing questions from the question bank.

Part 66 assigns knowledge levels (1, 2, or 3) to each sub-topic within each module. Level 1 requires familiarisation, Level 2 requires general knowledge, and Level 3 requires detailed knowledge. Question banks should tag questions by knowledge level to ensure proper syllabus coverage. Read: Part 147 vs Part 66 →

An organisation approved under EASA Part 147 to deliver approved maintenance training courses. MTOs may deliver basic training (leading to Part 66 licences) and/or type training (for specific aircraft types).

The foundation document of a Part 147 approval. The MTOE describes the organisation's structure, personnel, procedures, facilities, and approved training programmes. It must be kept current and amendments require NAA notification. Read: Audit Checklist →

The government authority responsible for aviation regulation in a particular country (e.g., CAA in the UK, DGAC in France, LBA in Germany). The NAA grants and oversees Part 147 approvals and conducts surveillance audits.

Practical training conducted in a real or simulated working environment. In a Part 147 context, OJT refers to practical tasks and workshop skills that students must complete as part of their basic training, typically assessed against the P1–P9 framework.

The EASA regulation defining the requirements for aircraft maintenance licences. Part 66 specifies the licence categories (A, B1, B2, B3, C), the knowledge syllabus (organised into modules), examination standards, and experience requirements. Read: Part 147 vs Part 66 →

The EASA regulation governing maintenance training organisations (MTOs). Part 147 sets the requirements for facilities, instructors, training programmes, examinations, record-keeping, and certificate issuance. Read: What is EASA Part 147? →

The nine practical skill areas defined for basic training workshop assessments. These cover skills such as safety practices, hand skills, mechanical practices, electrical practices, and more. Each must be assessed and signed off before a CoR can be issued.

The structured repository of examination questions used by a Part 147 MTO. A well-managed question bank tags questions by Part 66 module, sub-topic, knowledge level, and difficulty. It includes version control, review cycle tracking, and access control. Read: Managing Question Banks →

The person responsible for the MTO's internal quality system. The Quality Manager oversees internal audits, manages corrective actions, and ensures ongoing compliance with Part 147 requirements. Must be named in the MTOE.

A subsequent attempt at an examination after a student has failed. Re-sit procedures, including waiting periods and maximum attempts, must be documented in the MTOE and followed consistently.

A periodic audit conducted by the NAA to verify that a Part 147 MTO continues to meet the requirements of its approval. Surveillance audits typically occur annually and may be announced or unannounced. Read: Audit Checklist →

Software used to manage the full training lifecycle — from student enrolment through scheduling, examinations, and certification. In a Part 147 context, a purpose-built TMS like AMTOS replaces generic LMS software with aviation-specific functionality. Read: How to Choose a TMS →

Training specific to a particular aircraft type (e.g., Boeing 737, Airbus A320). Type training is distinct from basic training and leads to a type rating on the engineer's Part 66 licence. Part 147 MTOs may be approved to deliver type training in addition to basic training.