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Drone Regulation Overview 2025-09-15 2025-09-15

Drone Regulation Overview

Drone Compliance & Airspace Technology — Engineer’s Primer (Swiss/EASA Focus)

Version: 2025-09-11

Purpose: Give engineers who build sub‑4 kg autonomous drones a clear, technical understanding of the regulatory landscape (Swiss/EASA-first, FAA side-notes) and the enabling technologies (ADS‑B, FLARM, Remote ID, U‑space, class standards, categories, pilot certs, SORA). Each chapter ends with references to authoritative sources.

1) Executive Overview — What matters for an engineer

  • Regime: In Switzerland the rules mirror EASA (EU) via FOCA. Operations are grouped by risk: Open, Specific, Certified. Most BVLOS delivery work sits in Specific with SORA-based authorization (or STS‑02 where applicable). citeturn0search8
  • Identification: Direct/Broadcast Remote ID is mandatory (EU/CH: since 2024‑01‑01 for Specific and class‑marked Open; US: RID required since 2024‑03‑16 outside FRIAs). citeturn0search8turn0search4
  • Conspicuity & DAA: ADS‑B Out is generally not for small UAS in EU and prohibited under FAA Part 107 unless authorized. ADS‑B In and FLARM receivers are useful mitigations but not broadly mandated. citeturn0search13
  • Airspace: Default drone ceiling 120 m AGL in EU Open; controlled airspace/geo‑zones require authorization. U‑space introduces digital services (network ID, flight authorizations, traffic info) inside designated volumes. citeturn0search8turn0search6
  • Design classes: C0–C6 CE classes tie hardware features (Remote ID, geo‑awareness, low‑speed, termination systems) to where/how the drone may legally fly. STS‑01/02 rely on C5/C6. citeturn0search9

2) Airspace & Regulatory Landscape (Swiss/EASA-first)

2.1 Airspace basics (engineer’s view)

  • Uncontrolled (Class G): Where most small UAS operate; still bound by geo‑zones and 120 m AGL (Open). Specific authorizations may approve higher altitudes.
  • Controlled: CTR/TMZ etc. near airports — pre‑authorization and coordination needed; often handled via national portals; in Open category generally not allowed without procedures.
  • Geo‑zones: States publish UAS geographical zones (no‑fly/restricted/conditional). You must consume these data into your planner/geo‑fence. citeturn0search8

U‑space (EU/CH): Reg. (EU) 2021/664 creates designated low‑altitude volumes where operations require using USSP services: Network RID, Flight Authorization, Geo‑awareness info, Traffic Information/Strategic deconfliction. Expect API‑based plan filing, conformance monitoring, and tactical advisories. citeturn0search6turn0search14

FAA side‑note: No nationwide “U‑space” yet; LAANC provides digital authorizations in controlled airspace; broader UTM is evolving via FAA/NASA. RID broadcast is required nationally. citeturn0search4

3) EASA Operational Categories & Where BVLOS Fits

  • Open (A1/A2/A3): Low‑risk, VLOS only, ≤120 m, no prior approval; subcategories control proximity to people (A1 over people incidentally, A2 close, A3 far). citeturn0search8
  • Specific: For anything beyond Open (e.g., BVLOS, urban delivery). Access via Standard Scenarios (STS‑01 VLOS in populated controlled area; STS‑02 BVLOS w/ observers in sparsely populated area) or via SORA operational authorization (custom/PDRA). citeturn0search8
  • Certified: High‑risk (large UAS, over assemblies, passenger/cargo) — aircraft & operator certification akin to manned aviation.

FAA side‑note: Part 107 (VLOS) + waivers/exemptions for advanced ops; RID mandatory; ADS‑B Out prohibited under Part 107 unless authorized. citeturn0search5turn0search13

4) EASA Design Classes (C0–C6) — What to build into the aircraft

Why it matters: The class mark constrains legal use (Open subcategory) and, for STS, is required (C5/C6). As designers, you must meet EN/CE feature sets.

  • C0 (<250 g): No RID/geo‑awareness required; A1 use.
  • C1 (<900 g): Direct RID & geo‑awareness required; A1.
  • C2 (<4 kg): Direct RID & geo‑awareness, low‑speed mode ≤3 m/s; A2.
  • C3 (<25 kg): Direct RID & geo‑awareness; A3.
  • C4 (<25 kg): “Model” (no automation), no RID requirement; A3.
  • C5 (STS‑01) / C6 (STS‑02): Direct RID, flight termination (e.g., parachute/kill), geographical containment (C6), speed caps (C5 ≤5 m/s, C6 ≤50 m/s). citeturn0search9

Engineer’s checklist (C2/C5/C6 highlights):

  • Direct RID radio (Wi‑Fi/BLE) per 2019/945 & harmonized standards.
  • Geo‑awareness (consume national geo‑zone datasets; onboard inhibit/warning).
  • Low‑speed mode (C2/C5) with deterministic entry/exit.
  • Termination system (C5/C6): independent power/logic; validated opening altitude/energy.
  • Containment (C6): hard fences in nav stack + RF/gnss integrity checks.

FAA side‑note: No CE class marks. Instead, operations‑over‑people categories impose injury energy limits (Cat 2/3) or require airworthiness (Cat 4). Manufacturers can seek Means of Compliance acceptance to unlock those ops. citeturn0search5

5) Technology Deep‑Dives

5.1 ADS‑B (In/Out)

What it is: Cooperative surveillance; aircraft compute GNSS position & broadcast periodically.

  • Links: 1090 ES (global) and 978 UAT (US‑only <FL180). ADS‑B Out = transmit; ADS‑B In = receive (incl. TIS‑B traffic, FIS‑B weather on UAT). citeturn2search1turn2search5turn2search12
  • Why small UAS don’t TX ADS‑B: 1090 MHz saturation & address space; EU doesn’t mandate; FAA Part 107 forbids ADS‑B Out unless authorized. Use Remote ID for ID instead. citeturn0search13

Implementation notes (In on a drone):

  • RF front‑end @ 1090 MHz; demod 1090ES DF17/DF18; parse ICAO address, position, velocity.
  • Sensor fusion: Use ADS‑B In as cooperative DAA cue with geofence & tactical loiters.
  • Limitations: Not all manned aircraft emit ADS‑B (legacy, exemptions); don’t rely on it as sole DAA.

References: FAA ADS‑B overview; equipage & links; pilot apps (TIS‑B/FIS‑B). citeturn2search4turn2search1turn2search5

FAA side‑note: ADS‑B Out mandated for manned aircraft in most controlled airspace; dual‑link specifics and service nuances documented by FAA. citeturn2search0

5.2 FLARM

What it is: Short‑range, predictive collision‑warning system popular in gliders/GA; uses 868/915 MHz ISM/SRD to exchange ownship state + predicted 3D path and raises selective alerts only on collision risk. Typical >3–10 km range (PowerFLARM). citeturn1search0turn1search1turn1search10

Why it’s relevant to drones: Light, low‑power electronic conspicuity; improves mutual awareness with gliders/helos at low altitude; counted as air‑risk mitigation in SORA packages.

Implementation notes:

  • Radio: 868/915 MHz; modest TX power; antenna placement critical for hemispherical view.
  • Data: Proprietary air interface; open serial ICD for cockpit/UAV integration; many units also receive ADS‑B/Mode S. citeturn1search10

References: FLARM overview; PowerFLARM range/tech; manuals. citeturn1search0turn1search1turn1search3

FAA side‑note: No FAA mandate; used voluntarily by US glider/GA community; may be added to UAS as a voluntary DAA aid in waivers/experiments.

5.3 Remote ID (Direct/Broadcast; Network in U‑space)

Direct/Broadcast RID (EU/CH & US): Drone broadcasts ID + live telemetry (Wi‑Fi/BLE beacons) readable by smartphones/authorities.

  • EU/CH: Mandatory since 2024‑01‑01 for Specific and class‑marked Open (C1‑C3/C5/C6). Operator ID must be encoded. Retrofitting allowed via approved modules. citeturn0search8
  • US: Two paths — Standard RID (built‑in) or Broadcast Module; required since 2024‑03‑16 outside FRIAs. citeturn0search4turn0search12

Network RID (U‑space): In designated U‑space, the operator streams identity/telemetry to USSP for strategic deconfliction and traffic info. This complements (not replaces) Direct RID. citeturn0search6

Implementation notes:

  • Tx stack: Periodic BLE/Wi‑Fi NAN frames; ensure GNSS integrity & timestamping; encode EU Operator ID / FAA reg per jurisdiction.
  • Ground app/API: Make your GCS able to display nearby RID and publish Network RID to USSP when required.

References: EASA Easy Access rules; FAA RID portal. citeturn0search8turn0search4

6) Pilot Competency (what your ops team needs)

  • EU/CH: A1/A3 online course+exam (Open), A2 theory exam for close‑to‑people. Specific: scenario‑specific training (e.g., STS‑01/02) and any training mandated by your Operational Authorization. Mutual recognition EU‑wide. citeturn0search8
  • US: Part 107 Remote Pilot Certificate (knowledge test; recurrent training) for non‑recreational ops. citeturn0search5

7) SORA — How to write a winning safety case

Concept of Operations (ConOps): Exact what/where/how: UAV, airspace, altitude, population, comms, automation mode, contingencies.
Risk process (v2.5):

  1. GRC (ground risk) from mass/KE + environment → apply mitigations (controlled ground area, parachute).
  2. ARC (air risk) from airspace/traffic → apply strategic (airspace/time selection, segregation) and tactical mitigations (DAA: observers, ADS‑B/FLARM In, GBDAA).
  3. Map to SAIL I–VI, then satisfy OSOs at required robustness (technical, operational, human). citeturn0search7turn0search15

Engineer’s angle: SORA drives design requirements: redundancy, termination, containment, C2 link integrity, logs, health monitoring, and DAA sensors. Build these early to keep SAIL low.

References: JARUS SORA v2.5; EASA AMC/GM summaries. citeturn0search7turn0search15

8) Practical Build Guidance (sub‑4 kg BVLOS delivery)

Avionics/stack checklist

  • RID: CE‑compliant Direct RID module/firmware; operator ID provisioning; broadcast self‑tests. citeturn0search8
  • Geo‑awareness: Ingest UAS geo‑zone data; pre‑arm checks; hard geofence with graceful abort. citeturn0search8
  • DAA: ADS‑B In (1090) & FLARM receiver for cooperative traffic; non‑coop sensing where risk needs it. citeturn2search4turn1search0
  • Termination/Containment: Independent parachute/kill (C5/C6) with test evidence; C6 containment volume in FMS. citeturn0search9
  • Ops tooling: SORA artifact generator; flight log integrity; U‑space/USSP API client (when applicable). citeturn0search6

Program/approval path (EU/CH)

  1. If rural BVLOS fits STS‑02, design to C6 & train STS pilots → declaration path.
  2. Otherwise: compile SORA (ConOps, GRC/ARC, OSOs), specify mitigations, and apply to FOCA/NAA. citeturn0search11

US comparison: Part 107 operations baseline; for BVLOS/package delivery, expect waiver/exemption and design toward DAA + containment; RID mandatory; no ADS‑B Out. citeturn0search4turn0search13

9) Reference Library (authoritative)

  • EASA Easy Access Rules (2019/947 & 2019/945, rev. 2024): Overview of categories, class standards, pilot competency. citeturn0search8
  • Reg.(EU) 2019/945: UAS/class technical requirements (C0–C6). citeturn0search1turn0search9turn0search17
  • U‑space Reg.(EU) 2021/664 — Easy Access: Services & obligations in U‑space. citeturn0search6
  • FOCA (CH) Specific category portal: Swiss process & maps. citeturn0search11
  • FAA Remote ID portal: Compliance paths & modules. citeturn0search4turn0search12
  • FAA Part 107 (eCFR): Operating rules, waivers, pilot cert. citeturn0search5
  • ADS‑B primers (FAA): Technology, links, services (TIS‑B/FIS‑B). citeturn2search4turn2search1turn2search5
  • FLARM: System overview & manuals; technical band info. citeturn1search0turn1search3turn1search10

Appendix A — Quick glossary

  • Direct/Broadcast RID: Local Wi‑Fi/BLE beacons with ID/telemetry from UAV.
  • Network RID: Internet uplink to UTM/USSP carrying ID/telemetry for deconfliction.
  • USSP: U‑space Service Provider (EU).
  • TIS‑B/FIS‑B: Ground rebroadcast traffic / weather for ADS‑B In users (US).
  • OSO/SAIL: SORA Operational Safety Objective / assurance level I–VI.

© 2025. This learning resource summarizes public regulations — always verify current national notices and airspace data before operations.

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