C5 and C6 for STS

C5 class requirements

C5 is the certified drone class used in STS-01 operations. C5 aircraft must have specific safety features: a Flight Termination System (FTS) or parachute, broadcast Remote ID, and meet the EASA EN4709-002 standard.

A C5-class aircraft enables flight over people in a controlled ground area under the STS-01 standard scenario. The classification must be granted by the manufacturer — you cannot self-classify your own drone as C5.

C6 class and STS-02

C6 class is used in STS-02 scenarios, permitting BVLOS operations within 1 km of a visually-observed zone from the pilot. C6 aircraft must carry additional safety and identification features.

C6 drones are expensive and specialised — typically used in industrial inspection, agriculture or corridor-type missions. Few entry-level pilots start with C6 operations.

STS-01 scenario requirements

STS-01: flight over people in a controlled ground area, VLOS, with C5 aircraft, up to 120 m AGL. Requires an STS-01 operational authorisation number from an accredited organisation and practical competency proof.

STS-01 is the most frequently used STS scenario for commercial photography, inspections and mapping in urban environments.

STS-02 scenario requirements

STS-02: BVLOS up to 1 km within a visually-observed zone using a C6 aircraft with additional safety measures. A visual observer is required during the mission.

STS-02 suits corridor-type missions: linear infrastructure inspection, agricultural survey work or coastal monitoring. For a full STS comparison, see /blog/sts-01-vs-sts-02-guide.

Frequently asked questions

Can I mark my own drone as C5 or C6?

No. C5 and C6 classification must be granted by the manufacturer and meet EASA requirements. Self-classification is not permitted.

Does STS require a separate exam from A2?

Yes. The STS exam is separate from A1/A3 and A2. Both theoretical and practical STS examinations are conducted through an accredited training organisation.