--- title: "66.A.5 Aircraft groups — Part-66 · Avioverse" description: "For the purpose of ratings on aircraft maintenance licences, aircraft shall be classified into the following groups:" url: "https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/section-a-technical-requirements/66-a-5" --- # 66.A.5 Aircraft groups Annex III (Part-66) · Regulation (EU) No 1321/2014 · EAR revision 2 Sep 2025 IR Implementing rule ## 66.A.5 Aircraft groups For the purpose of ratings on [aircraft](https://avioverse.aero/glossary/easa/aircraft) [maintenance](https://avioverse.aero/glossary/easa/maintenance) licences, aircraft shall be classified into the following groups: (1) Group 1 is composed of: (i) aeroplanes certified for a MTOM exceeding 5 700 kg; aeroplanes certified for a maximum passenger seating configuration of more than 19; aeroplanes certified for operation with a minimum crew of at least two pilots; aeroplanes equipped with (one) turbojet engine(s) or more than one turboprop engine; aeroplanes with maximum certified operating altitude exceeding FL290 powered with a power plant other than piston; aeroplanes with a power plant not being piston, turbine or electric; (ii) helicopters certified for a MTOM exceeding 3 175 kg; helicopters certified for a maximum passenger seating configuration of more than nine; helicopters certified for operation with a minimum crew of at least two pilots; helicopters equipped with multiple engines; helicopters equipped with a power plant not being piston, turbine or electric; (iii) gas airships other than ELA2; (iv) [non-conventional aircraft](https://avioverse.aero/glossary/easa/non-conventional-aircraft); and (v) aircraft equipped with fly-by-wire systems. Notwithstanding the first paragraph, the Agency may decide to classify into a subgroup of Group 2, Group 3 or Group 4, as appropriate, an aircraft which meets the conditions set out in the first paragraph, if it considers that the lower complexity of the particular aircraft justifies so. (2) Group 2: aircraft other than those in Group 1 belonging to the following subgroups: (i) subgroup 2a: single turboprop engine aeroplanes; (ii) subgroup 2b: single turbine engine helicopters; (iii) subgroup 2c: single piston engine helicopters; (iv) subgroup 2E: aeroplanes with electric power plant. (3) Group 3: piston engine aeroplanes other than those in Group 1. (4) Group 4: sailplanes, powered sailplanes, balloons and airships, other than those in Group 1. IR · 66.A.5 — Regulation (EU) No 1321/2014 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025 GM Guidance material ## GM1 66.A.5 Aircraft groups The following table summarises the applicability of categories/subcategories of Part-66 licences versus the groups/subgroups of [aircraft](https://avioverse.aero/glossary/easa/aircraft): | Category/subcategory Groups | A, B1 and C | B2 | B2L | B3 | L | | | | | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------- | ------- | ------- | -- | ---------- | ---------- | ----------- | ----------- | -- | | | | | | | L1C and L1 | L2C and L2 | L3H and L3G | L4H and L4G | L5 | | 1 Group 1 aircraft, except airships | X | X | | | | | | | | | 1 Group 1 airships | (\*) | X | | | | | | | X | | 2 The following aircraft that are not in Group 1: 2a: Single-turboprop-engine aeroplanes 2b: Single-turbine-engine helicopters 2c: Single-piston-engine helicopters | X | X | X | | | | | | | | 2E: aeroplanes with electric power plant | (\*), X | X | X | | | | | | | | 3 — Piston-engine aeroplanes (other than Group 1 aeroplanes) | X | X | X | | | | | | | | 3 — Non-pressurised ELA2 piston-engine aeroplanes (other than Group 1 aeroplanes) | X | X | X | X | | | | | | | 3 — ELA1 piston-engine aeroplanes (other than Group 1 aeroplanes) | X | X | X | X | | X | | | | | 4 — Sailplanes — Powered sailplanes — Balloons — Airships not in Group 1 | (\*) (\*) (\*) (\*) | X X X X | X X X X | | X | X X | X | X | X | | Aircraft referred to in point 66.A.3(b) | (Category/subcategory as identified in the aircraft OSD) | | | | | | | | | (\*) A1 and A3 may be used for any aircraft other than turbine-/piston-engine aeroplanes and turbine-/piston-engine helicopters (in accordance with point 66.A.3(a)(1)(ii) and point 66.A.20 of Part-66). GM · GM1 66.A.5 — Regulation (EU) No 1321/2014 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025 [All rules in SECTION A — TECHNICAL REQUIREMENTS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/section-a-technical-requirements) Consolidated from the EASA Easy Access Rules (revision 2 Sep 2025, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.