Standard Scenarios
STS-02 Explained for Drone Operators
In the United Kingdom, the use of Standard Scenarios (STS) represents a significant development in Unmanned Aircraft Systems (UAS) regulation. STS-02 is one such scenario, enabling drone operators to conduct specific operations without extensive authorisations, provided certain conditions are met.
What Is STS-02?
STS-02 is a Standard Scenario designed for Beyond Visual Line of Sight (BVLOS) operations with unmanned aircraft. It allows operators to perform flights beyond the remote pilot's visual line of sight under specific conditions.
The key features of STS-02 are:
- UAS Class: The drone must have a UK CAA-approved classification, meeting specific technical criteria for detect and avoid capabilities.
- Operational Area: The flight must take place over a controlled ground area in a sparsely populated region.
- Distance: The maximum distance between the drone and the remote pilot observer is 2 km with observers; without observers, it is 1 km.
Why Is STS-02 Important for Drone Operators?
STS-02 makes complex BVLOS operations accessible to both professional and novice drone operators without the need for extensive risk assessments such as a full Specific Operations Risk Assessment (SORA). This streamlines the operational process and reduces the administrative burdens associated with authorisation.
The scenario provides an acceptable safety framework by ensuring that the risk of collisions with manned aircraft and other hazards is sufficiently controlled. This enables drone operators to provide the necessary assurances to the UK CAA while operating efficiently.
- Enables accessible BVLOS operations without full SORA
- Streamlines the operation approval process
- Provides a safety framework for collision risk management
Requirements to Apply STS-02
To operate under STS-02, the drone needs to have a UK CAA-approved classification confirming it meets required technical standards for detect and avoid capabilities.
The operator must select an operational area that is a safe, controlled ground location in a sparsely populated environment. Additionally, there are limits on the maximum distance between the drone and the remote pilot observer, and on maximum flight altitude, to mitigate risks.
Notification to the UK CAA is mandatory prior to conducting STS-02 operations. Operational documentation such as a Concept of Operations (ConOps) should be well structured, for example using DroneManual tools.
The operational manual must explicitly include STS-02 procedures, ensuring Emergency Response Planning (ERP) and Ground Risk Class (GRC) compliance are maintained.
- Drone must have UK CAA-approved classification
- Operational area: controlled ground location in a sparsely populated area
- Comply with distance and altitude restrictions
- Notify UK CAA and structure operational documents accordingly
- Include STS-02 procedures in the operational manual
Practical Tips and Common Mistakes
One common error is exceeding the maximum permitted distance between the drone and the remote pilot observer, which can result in unsafe conditions and regulatory breaches.
Another frequent issue is deploying drones that lack the required UK CAA-approved classification, often due to inadequate verification. It is vital to check that the drone’s CE marking and classification are correct before operating.
Some operators also underestimate the importance of a comprehensive Concept of Operations (ConOps), especially regarding communication with any airspace observers. Without a detailed ConOps, demonstrating compliance with STS-02 becomes challenging.
- Do not exceed the maximum distance between drone and remote pilot observer
- Verify drone’s UK CAA-approved classification and CE mark
- Prepare a detailed ConOps including communication protocols with observers
Checklist for a Safe and Compliant STS-02 Operation
Use this checklist to ensure your STS-02 operation is compliant and safe:
- Verify drone has UK CAA-approved classification
- Confirm operational area is a controlled, sparsely populated ground location
- Check maximum allowed distance to remote pilot observer and flight altitude
- Prepare and maintain a detailed Concept of Operations (ConOps) and Emergency Response Plan (ERP)
- Notify the UK CAA of the operation as required by national procedures
Frequently asked questions
What are the requirements for conducting an STS-02 operation?
To conduct an STS-02 operation, your drone must meet the UK CAA-approved classification specifications. The flight must occur over a controlled ground area in a sparsely populated region. Additionally, maximum distances to the remote pilot observer (1 km without observers, 2 km with observers) and a maximum flight altitude of 120 metres must be respected. The overall risk of encounters with manned aircraft should be low.
Is a full Specific Operations Risk Assessment (SORA) required for STS-02?
No, STS are standard scenarios designed to replace the need for a full SORA under specified conditions. This enables UAS operators to begin BVLOS operations more quickly without a lengthy individual risk assessment process.
Are STS-02 operations permitted in controlled airspace?
Yes, STS-02 allows operations in both controlled and uncontrolled airspace, provided the risk remains low and all conditions are strictly observed.
What documents must drone operators maintain for STS-02?
Operators should keep updated records including a Concept of Operations (ConOps), an operational manual that explicitly includes STS-02 procedures, and an Emergency Response Plan (ERP). These documents support compliance with UK CAA requirements.
How can I ensure my drone has the UK CAA-approved classification?
You should verify the drone’s CE marking and check the accompanying technical documentation. The manufacturer or supplier must clearly indicate if the drone holds the appropriate UK CAA classification. Without this, operating under STS-02 is not permitted.