In the sophisticated and technically demanding world of modern seafaring—particularly within the superyacht and commercial vessel sectors—the engine room is the beating heart of the operation.
Behind every seamless voyage and luxury experience is a team of highly skilled marine engineers: the unsung heroes who ensure the vessel operates safely, efficiently, and reliably. For anyone aspiring to join these essential ranks, the journey begins with a non-negotiable foundation: the Maritime and Coastguard Agency (MCA) Approved Engine Courses.
This guide is your definitive resource for understanding these critical qualifications. We will delve into the specifics of the Approved Engine Course 1 (AEC 1) and its advanced successor, the Approved Engine Course 2 (AEC 2). Join us as we navigate the path to becoming a qualified marine engineer and discover why Palma Sea School is the premier institution to power your career forward.
Understanding the Approved Engine Course (AEC): Your Gateway to the Engine Room
Before diving into the specifics, it is crucial to understand the authority of the AEC qualification. These are not merely introductory workshops; they are formally structured programmes designed to meet the stringent Certificate of Competency (CoC) requirements set by the MCA for the “Small Vessel” (SV) engineering route.
The MCA defines the Small Vessel category as encompassing a diverse fleet of vessels that are:
- Less than 3,000 Gross Tonnes (GT)
- Propulsive power of less than 9,000 kW
While often associated with superyachts, the AEC is a passport to a career across multiple sectors, including Tugs, Fishing Vessels, Workboats, Seismic Survey ships, and Government Patrol Vessels. This transferability makes the AEC a robust credential, offering career flexibility and resilience across the entire maritime industry.
Laying the Foundation: MCA Approved Engine Course 1 (AEC 1)
What is the AEC 1?
The MCA Approved Engine Course 1 is an intensive, five-day programme (typically 30–35 hours). Its core objective is to provide students with foundational theoretical knowledge and, crucially, hands-on experience with marine diesel engines.
The course is designed to elevate a student from an ‘entry-level’ understanding to a point where they can confidently manage, service, and troubleshoot a diesel engine. This is achieved through a blend of classroom theory and practical workshop sessions.
Who Should Take the AEC 1?
- Aspiring Engineers: The essential first step for those without formal qualifications. Qualifying experience for higher engineering tickets is generally only recognised after you hold an AEC.
- Deck Crew (Deckhands, Mates, Captains): Holding an AEC 1 makes you significantly more versatile, qualifying you for sought-after “dual deck/engineer” roles.
- Private Boat Owners: Gains the self-sufficiency to maintain vessels and prevent minor issues from becoming emergencies.
Prerequisites: Minimum age of 18. No prior engineering experience is necessary.
What Will You Learn? The AEC 1 Syllabus
The curriculum ensures graduates are well-rounded marine professionals.
| Module | Key Learning Objectives & Concepts |
| 1. The Compression Ignition Engine | 2-stroke vs 4-stroke cycles; engine construction; key terms (TDC, BDC, compression ratio); performance data interpretation. |
| 2. The Fuel System | Diesel properties; system breakdown (tanks, filters, separators, injectors); bleeding the system and fuel cleanliness. |
| 3. The Air System | Combustion process; air-to-fuel ratios; naturally aspirated vs. turbo/supercharged systems; intercoolers and exhaust components. |
| 4. The Cooling System | Heat exchange principles; raw vs. freshwater circuits; pumps, thermostats, and heat exchangers; winterisation procedures. |
| 5. The Lubrication System | Friction reduction; oil path tracing; pump types (gear, lobe); filters and pressure relief valves. |
| 6. The Electrical System | Lead-acid/alkaline batteries; alternators; split-charging; reading circuit diagrams; engine instrumentation and safety. |
| 7. Power Transmission | Gearboxes, clutches, and control systems; propeller shafting and couplings; alignment; stern tube bearings and seals. |
| 8. Hull Fittings & Safety | Seacocks and valves; cathodic protection; MARPOL pollution legislation; Code of Safe Working Practices; bottled LPG safety. |
Advancing Your Skills: MCA Approved Engine Course 2 (AEC 2)
What is the AEC 2?
The Approved Engine Course 2 (AEC 2) is the essential second stage in the Small Vessel engineering pathway. It is a five-day, 35-hour course that builds directly upon the AEC 1. It is mandatory for anyone wishing to progress to the Small Vessel Second Engineer Officer qualification and beyond.
Who Needs the AEC 2?
This course is for holders of the AEC 1 certificate who are committed to a professional career. It is the gateway to higher Certificates of Competency (CoC), aimed at those securing roles as Junior or Assistant Engineers.
Expanding Your Expertise: The AEC 2 Syllabus
Where AEC 1 focuses on the engine, AEC 2 broadens the scope to auxiliary systems and management responsibilities.
| Module | Key Learning Objectives & Concepts |
| 1. Refrigeration Systems | Compression refrigeration cycle; components (compressor, condenser, evaporator); fault finding and corrective actions. |
| 2. Legislation & Management | MARPOL Annexes (I, IV, V, VI); Code of Safe Working Practices (COSWAP); Engine Log Book and Oil Record Book management. |
| 3. Maintenance Systems | Planned maintenance schedules; condition-based monitoring; oil analysis, vibration analysis, and thermographic surveys. |
| 4. Safe Systems of Work | Risk assessments; Material Safety Data Sheets (MSDS); ‘Permit to Work’ systems; enclosed space entry procedures. |
| 5. Lifting & Slinging | Safe manual lifting; LOLER inspection requirements; practical use of lifting equipment for heavy objects. |
| 6. Electrical Distribution | Shipboard distribution layouts; protection devices; PPE for electrical work; use of insulation and continuity testers. |
| 7. Hydraulic Systems | Reading hydraulic circuit diagrams; routine maintenance (filters); basic fault finding and rectification. |
| 8. Auxiliary Systems | Potable water systems (storage, treatment, testing); sewage treatment plants (MARPOL Annex IV); H2S and Ammonia hazards. |
Charting Your Course: Career Prospects & Salary
Completing your AEC 1 & 2 is the beginning of a structured, rewarding career. These certificates are the foundational building blocks for the Small Vessel engineering pathway.
The Career Pathway
- AEC 1 & 2: The mandatory entry point.
- Marine Engine Operator Licence (MEOL): Required for Chief Engineers on UK vessels <750 kW (Near Coastal).
- Small Vessel (SV) Chief Engineer CoC: The main ladder to senior ranks (formerly Y4/Y3/Y2/Y1), requiring sea service that only counts after obtaining your AEC.
Job Roles and Earning Potential
Obtaining an AEC is a direct investment in your future earning potential. It acts as a salary multiplier, opening the door to a steeper trajectory of advancement than deck roles alone.
Indicative Monthly Salaries (Industry Estimates):
| Role | Vessel Size | Approx. Monthly Salary (€) | Typical Minimum Qualification |
| Junior / OOW Engineer | 50m – 100m+ | €3,000 – €4,500 | AEC 1 & 2, STCW |
| Third Engineer | 70m – 100m+ | €4,000 – €5,500 | AEC / EOOW |
| Second Engineer | 40m – 70m+ | €4,500 – €7,000+ | AEC / SV Second Engineer |
| Sole / Chief Engineer | 30m – 50m | €5,000 – €8,000+ | SV Chief 3,000kW |
| Chief Engineer | 50m+ | €7,000 – €20,000+ | SV Chief 9,000kW |
Why Train at Palma Sea School?
Choosing where to gain your qualifications is as important as the certificates themselves. Palma Sea School offers expertise, support, and a genuine pathway into the industry.
1. Unmatched Expertise & Location
As the longest-established RYA and MCA training centre in Palma de Mallorca, we are located on the main Paseo Marítimo. This places you in the epicentre of the Mediterranean superyacht industry, surrounded by marinas, shipyards, and crew agencies.
2. World-Class Instructors
Our engineering courses are led by highly experienced marine engineers who bring years of real-world sea time into the classroom.
“Outstanding tuition… All staff are very knowledgeable, personable and kind. Definitely going back for any future tuition.” — Vinny (Student Review)
3. Flexible Options: Palma or the UK
Prefer to train in the UK? Our sister company, South West Maritime Academy, delivers the same high-quality AEC 1 and AEC 2 courses at a purpose-built facility in Cromhall, South Gloucestershire.
Your Next Step
Embarking on your marine engineering career is a significant step. Whether you are a deckhand looking to upskill or an aspiring engineer ready to enter the engine room, the AEC is your key.
Recommendation: For those serious about fast-tracking their career, we highly recommend the AEC 1 & 2 Combined 2-Week Package. It is the most efficient way to gain both qualifications and set yourself on a direct path to success.
Ready to power your future? View our course dates and enrol today.
(Disclaimer: Course content and regulations are subject to MCA updates. Salary figures are indicative based on industry data and may vary by vessel and experience.)