Maintaining power plant on aircraft (Aviation Maintenance) Revision — Excellence, Achievement & Learning Limited Occupational Qualification

    This unit identifies the training and development required in order that the apprentice can demonstrate that they arecompetent in being able to carry out maintenance activities on aircraft power plant, in accordance with the approved aircraftmaintenance manual, approved change documentation (service bulletin) and airworthiness requirements. It covers bothfixed wing and rotary winged aircraft, and covers the overall power package/engine dressing, inclusive of engine air intakes,engine mounts, cowling, scoops and cowl flaps. It does not cover engine strip down and maintenance activities, which arecovered in other standards/ATA chapters. The maintenance activities will include carrying out a complete engine change, andthe removal, fitting and testing of a range of power plant components. They will remove the required components and fitapproved replacements, as appropriate. They will then need to test and adjust the completed system to meet the aircraftmaintenance manual, change documentation (service bulletin) and airworthiness requirements.

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    Key Marking Points

    Maintaining power plant on aircraft (Aviation Maintenance)

    EXCELLENCE-ACHIEVEMENT-AND-LEARNING-LIMITED
    vocational

    This unit covers maintenance activities on aircraft power plants, including engine changes and component removal/fitting, following approved manuals and airworthiness requirements. It applies to both fixed-wing and rotary-wing aircraft, focusing on the power package/engine dressing without engine strip-down.

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    Learning Outcomes
    3
    Assessment Guidance
    3
    Key Skills
    1
    Key Terms
    5
    Assessment Criteria

    Assessment criteria

    EAL Level 3 Diploma in Aviation Maintenance (Development Competence)

    Topic Overview

    The EAL Level 3 Diploma in Aviation Maintenance (Development Competence) is a vocational qualification designed for individuals pursuing a career as aircraft maintenance technicians or engineers. It covers the fundamental knowledge and practical skills required to maintain, repair, and certify aircraft in compliance with UK Civil Aviation Authority (CAA) and European Aviation Safety Agency (EASA) regulations. This diploma is part of the Apprenticeship Standard for Aviation Maintenance Mechanic and provides a pathway to obtaining an Aircraft Maintenance Licence (AML) under Part-66.

    The qualification is structured around key modules including aerodynamics, aircraft structures, propulsion systems, electrical and avionic systems, and maintenance practices. Students learn to interpret technical documentation, use specialised tools, perform inspections, and carry out fault diagnosis. Emphasis is placed on health and safety, human factors, and regulatory compliance, ensuring graduates can work safely and effectively in a highly regulated environment.

    This diploma is essential for anyone aiming to work in aircraft maintenance, as it combines theoretical knowledge with hands-on competence. It prepares students for roles in airlines, maintenance repair organisations (MROs), and the armed forces. Successfully completing this qualification demonstrates to employers that you have met the industry standards for entry-level technicians and are ready to progress towards full licensing.

    Key Concepts

    Core ideas you must understand for this topic

    • →Airworthiness and Regulatory Framework: Understanding CAA, EASA, and FAA regulations, including Part-145 (maintenance organisations) and Part-66 (licensing).
    • →Aircraft Structures and Materials: Knowledge of airframe construction, stress analysis, corrosion prevention, and composite materials.
    • →Propulsion Systems: Principles of gas turbine and piston engines, including components, operation, and troubleshooting.
    • →Electrical and Avionic Systems: Basics of AC/DC circuits, aircraft wiring, instruments, and communication/navigation systems.
    • →Maintenance Practices: Use of technical manuals, tool control, torque procedures, and documentation (e.g., logbooks, work cards).

    What You Need to Demonstrate

    Key skills and knowledge for this topic

    • Correctly interpret maintenance manual and service bulletin instructions.
    • Safely remove and install power plant components using approved tools.
    • Perform engine change procedures in line with airworthiness requirements.
    • Test and adjust the power plant system to specified tolerances.
    • Complete documentation accurately, including logbook entries.

    Assessment Criteria

    Key criteria assessors look for in your portfolio

    • Correctly interpret maintenance manual and service bulletin instructions.
    • Safely remove and install power plant components using approved tools.
    • Perform engine change procedures in line with airworthiness requirements.
    • Test and adjust the power plant system to specified tolerances.
    • Complete documentation accurately, including logbook entries.

    Assessment Guidance

    Guidance for achieving higher grades

    • 💡Memorise key torque values and safety wiring techniques for common components.
    • 💡Practice reading and cross-referencing maintenance manual sections quickly.
    • 💡Always double-check that all tools and materials are removed from the engine bay before closing.
    • 💡Always reference the correct regulatory document (e.g., EASA Part-145, CAP 562) in your answers. Examiners look for evidence that you understand the legal framework, not just technical details.
    • 💡When describing maintenance procedures, use the exact terminology from the Aircraft Maintenance Manual (AMM). For example, specify 'torque to 25 Nm' rather than 'tighten securely'.
    • 💡In practical assessments, demonstrate good housekeeping and tool control. Examiners note if you return tools to the shadow board and clean up after yourself – it shows professionalism.

    Common Mistakes

    Common errors to avoid in your coursework

    • Failing to follow torque specifications or using incorrect fasteners.
    • Overlooking safety precautions such as lock-wiring or cotter pin installation.
    • Misinterpreting service bulletin instructions or skipping steps.
    • Misconception: 'Aviation maintenance is just about fixing engines.' Correction: It involves a wide range of systems including avionics, hydraulics, pneumatics, and structures, all requiring integrated knowledge.
    • Misconception: 'You can skip the theory and just learn on the job.' Correction: The diploma requires a solid theoretical foundation to understand why procedures are done, which is critical for safety and certification.
    • Misconception: 'Once you have the diploma, you can certify any aircraft.' Correction: The diploma is a stepping stone; you must also gain practical experience and pass CAA exams to obtain a full Part-66 licence.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •Basic understanding of physics (forces, motion, electricity) and mathematics (algebra, trigonometry).
    • •Familiarity with workshop safety practices and hand tools (e.g., from a Level 2 Engineering qualification).
    • •GCSEs in English, Maths, and a Science subject (grade 4/C or above) are typically required for entry.

    Key Terminology

    Essential terms to know

    • This unit identifies the training and development required in order that the apprentice can demonstrate that they arecompetent in being able to carry out maintenance activities on aircraft power plant, in accordance with the approved aircraftmaintenance manual, approved change documentation (service bulletin) and airworthiness requirements. It covers bothfixed wing and rotary winged aircraft, and covers the overall power package/engine dressing, inclusive of engine air intakes,engine mounts, cowling, scoops and cowl flaps. It does not cover engine strip down and maintenance activities, which arecovered in other standards/ATA chapters. The maintenance activities will include carrying out a complete engine change, andthe removal, fitting and testing of a range of power plant components. They will remove the required components and fitapproved replacements, as appropriate. They will then need to test and adjust the completed system to meet the aircraftmaintenance manual, change documentation (service bulletin) and airworthiness requirements.

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