When we talk about aircraft maintenance at Protec Technical, the conversation is often focused on the commercial aviation and business jet sectors — the EASA Part-145 organisations maintaining narrowbodies, widebodies, and turboprop commuter aircraft. But there is another significant sector of the maintenance world that operates largely outside the public eye: general aviation (GA), light aircraft maintenance, and the network of small Part-M organisations and independent approved maintenance organisations that keep the UK’s and Europe’s vast GA fleet airworthy.
The GA Fleet
General aviation encompasses an enormous variety of aircraft types: single-engine piston aeroplanes from manufacturers including Cessna, Piper, Beechcraft, Diamond, and Cirrus; light twins; homebuilt aircraft; gliders; vintage and historic aircraft; and light sport aircraft of all descriptions. In the UK alone, there are thousands of GA aircraft on the register, and collectively they perform millions of flying hours each year in a range of activities from private flying and flight training to aerial survey, agriculture, and parachuting.
The Regulatory Framework: EASA Sub-Part M and the UK CAA
Maintenance of aircraft not requiring a Part-145 organisation is governed by EASA Part-M (now Part-ML for light aircraft in the EU) or, post-Brexit in the UK, the equivalent UK CAA framework. The requirements are less onerous than Part-145 — reflecting the lower risk profile of lighter, less complex aircraft — but are nonetheless structured to ensure appropriate maintenance standards.
For aircraft below a certain maximum take-off weight and operated non-commercially, owners are permitted to carry out certain maintenance tasks themselves (owner-maintenance) or to use independent certifying mechanics rather than being required to engage a formally approved organisation. This flexibility is important for the economics of GA operation, where the overhead of a full Part-145 approval is disproportionate to the aircraft being maintained.
Part-66 Category B3
The Part-66 Category B3 licence specifically covers the maintenance certification of non-pressurised piston-engine aeroplanes of 2,000 kg MTOM or less. This licence — with a somewhat different technical module structure from the B1 — provides a pathway into GA maintenance engineering for those whose interests lie in the lighter aircraft world.
It is worth noting that many GA maintenance engineers also hold higher category licences — B1.1 or B1.2 — and the B3 serves as a more accessible entry point for those focused exclusively on the GA sector.
Piston Engine Maintenance
Light aircraft piston engines — the Lycoming and Continental families that power the majority of single and twin-engine GA aircraft — have a distinctive maintenance regime compared to turbine engines. They are subject to hourly TBO (time between overhaul) limits rather than cycle-based limits, require periodic top overhauls and full engine overhauls at defined intervals, and have a range of airworthiness directives addressing issues such as crankcase cracking, valve train wear, and fuel system integrity that are specific to the GA piston world.
Careers in GA Maintenance
GA maintenance offers a career path that is different in character from commercial MRO. Smaller organisations, a closer relationship with aircraft owners and operators, more varied aircraft types, and the satisfaction of working on aircraft flown for passion rather than commerce are all features of the environment.
Pay levels in GA maintenance are typically lower than commercial MRO, reflecting the economic constraints of the sector. But for engineers who love aviation in its broadest sense and value the character of the work over the headline salary, GA is a genuinely rewarding environment.
While Protec Technical’s primary focus is on the commercial, business aviation, and defence maintenance sectors, we occasionally work on GA-related roles. Contact us if you have a specialist requirement or are an engineer exploring your options across the full spectrum of the sector.
