EASA subject
General UAS Knowledge
Types, link, classes, and functions
Understanding UAS classes (C0–C6), link types, RTH, FPV, and Remote ID — the technical foundation for EASA operations.
Key concepts
- C classes
- C0–C4 open category; C5–C6 specific category; CE marking on the UAS.
- Link
- Radio link, frequencies, interference, and lost-link procedure.
- RTH
- Return to Home — automatic return; the remote pilot remains responsible.
Common mistakes
- Confusing C classes with Open/Specific categories
- Treating FPV as a substitute for VLOS
Exam traps
- Which class applies to which category
- Remote ID requirements
Real-world example
Link is lost — RTH activates, but the pilot must assess obstacles on the return path.