A3 subcategory

A3 subcategory defined

A3 subcategory is for pilots flying in remote areas with heavier aircraft. A3 permits use of C4-class aircraft (up to 25 kg, legacy) and requires remaining at least 150 m from residential, commercial and industrial zones.

A3 offers the widest open-sky freedom but with a clear constraint: flights must be well away from people and built-up areas. In urban environments, A3 is practically unusable.

C4 class for A3 operations

C4 — legacy aircraft up to 25 kg MTOM that do not meet any other C-class certification requirement. C4 aircraft can fly in A3 without additional C-class certification requirements.

Critical note: C4 aircraft cannot fly in A1 or A2 subcategories — they are restricted to A3. This means C4 operators must always remain well away from people.

A3 vs A2 — when to choose A3

A3 is the right choice if you fly: 1) in fields, forests or coastal areas far from people, 2) with a heavy legacy aircraft, 3) your aircraft type doesn't qualify for A2 requirements.

A2 is right when you need to fly near people in urban areas with a C2 aircraft. A3 and A2 serve different needs — neither is inherently better.

A3 in exam questions

Exam questions on A3 typically test: the minimum distance from residential zones, which aircraft are permitted in A3, and how A3 differs from A1/A2.

Common mistake: assuming A3 allows flight anywhere in open fields. The 150 m rule from commercial or industrial zones still limits location choices even in rural areas.

Frequently asked questions

Does A3 require a separate exam?

No. A3 is included in the A1/A3 competency test — it is the same exam. Preparing for one covers the other.

Can I fly a legacy aircraft in A1 or A2?

Legacy aircraft (not certified as C0–C4) are generally restricted to A3 operations. A1 and A2 require the corresponding C-class aircraft. Check your aircraft's classification.