Drone Ops Consultants

Heavy-lift drone operations

Slung loads and load carrying

Heavy-lift drones carry tools, materials and equipment to places that are slow or unsafe to reach by hand, such as rooftops, towers, steep ground and remote work sites. Two things decide how this work is regulated. The first is the aircraft's take-off mass, which moves the flight out of the simplest rules at 25 kg in the UK and EU and at 55 pounds in the US. The second is what happens to the load in flight: whether it is carried inside, hung below the aircraft or released.

This guide covers the mass limits that trigger an authorization, how UK SORA and EASA's SORA treat heavier aircraft and their design evidence, the FAA route above 55 pounds, and how to plan for the ground risk of a carried load, the lift site and the crew. Releasing a load is covered in more depth in our dropping and dispensing guide.

Vetted consultants

2 results

Pegasus Vectoring

London, GB

Pegasus Vectoring provides specialist consultancy for organisations developing and operating unmanned aircraft systems (UAS) in the Specific Category. They guide clients from initial operational concept through SORA development, regulatory authorisation, and ongoing compliance assurance, ensuring safe, practical and regulator‑defensible capabilities. Services include operational design, airspace and ground environment assessment, SORA and operational authorisation support, competence development

Pegasus Vectoring Limited is an independent specialist consultancy helping organisations develop safe, practical and regulator-ready unmanned aviation capabilities. We start with the client’s operational need—not a predetermined regulatory solution. Working collaboratively, we define the objective, characterise the operating environment and develop a proportionate operational and regulatory strategy. Our support extends from early feasibility and concept development through risk assessment, OSC and SORA applications, operational documentation, findings resolution and ongoing assurance. Our experience includes BVLOS operations within Atypical Air Environments, critical infrastructure and heavy-lift UAS. Led by a former airline captain with 23 years of aviation experience and UK CAA and UAE GCAA Airline Transport Pilot Licences, Pegasus combines operational judgement with structured regulatory analysis. Our aim is not simply to secure an approval, but to help clients establish a safe, sustainable and scalable operational capability.

CAA
Heavy lift and slung load

Vaspba Remote Piloted Systems Ltd

Winfrith, GB

CAA Regulatory Consultancy | Agriculture | Heavy Lift | BVLOS | Drone Forensics & Expert Witness Support

Vaspba Remote Piloted Systems Ltd is a UK specialist in uncrewed aircraft systems, regulatory consultancy and operational support. We assist organisations with CAA Operational Authorisations, PDRA and SORA applications, ConOps, Operations Manuals, risk assessments, compliance evidence and BVLOS projects. Our services also include independent drone accident investigation, flight-log analysis, technical reporting and expert-witness support for legal, insurance and commercial disputes. With practical experience in UAS design, integration, testing, servicing and operations, we provide evidence-based advice grounded in real-world aviation and engineering experience.

CAA
Heavy lift and slung load

When weight and loads take you outside the simplest rules

In the UK, one of the conditions of the Open category is that the drone has a maximum take-off mass of less than 25 kg. The CAA says you must get its authorization if you want to fly a drone or model aircraft that weighs 25 kg or more. The UK's pre-defined risk assessment, PDRA01, only covers aircraft between 250 g and 25 kg flown within visual line of sight, so a heavier aircraft needs a full UK SORA application. PDRA01 also requires any load or equipment to be properly secured and does not allow articles to be dropped. Any commercial flight in the UK, whatever the drone's weight, also needs third-party insurance that complies with Assimilated Regulation (EU) 785/2004.

EASA gives the same weight boundary. Its guidance lists flying a drone with a maximum take-off mass over 25 kg, and dropping material, as examples of operations in the Specific category. Before flying in that category you need an operational authorization from the national aviation authority of the state where you are registered.

In the US, Part 107 defines a small unmanned aircraft as one weighing less than 55 pounds on takeoff, including everything on board or attached to it. The load counts towards that figure, so a lighter aircraft can cross the limit once it picks up its payload.

UK and EASA: heavier aircraft through SORA

New UK operational authorization applications have gone through UK SORA since 23 April 2025. Existing Operating Safety Case holders can still renew for 12 months, applying up to 90 days before expiry, until 31 December 2026. UK SORA is planned to be the route for everyone from 1 January 2027.

UK SORA sets ground risk mainly by size and speed. The intrinsic ground risk class comes from the aircraft's maximum characteristic dimension (the distance between blade tips for a rotorcraft, or the wingspan for a fixed-wing aircraft), its maximum speed as specified by the designer, and the population density below. Mass only changes the result at the lightest end, for aircraft of 250 g or less. A large heavy-lift aircraft therefore starts with a higher ground risk because of its size, before any load is added.

The evidence about the aircraft itself grows with the SAIL, the assurance level the assessment produces. Maintenance and configuration checks apply at every SAIL. Objectives on the manufacturer and on system safety and reliability start at SAIL 3, and from SAIL 4 the components essential to safe flight must be designed to an airworthiness design standard. Some of this evidence can come from the designer, and the CAA will accept a configuration that holds a CAA SAIL Mark certificate. At step 7 you give the make and model of the aircraft and any modifications, which is where a fitted winch, hook or cargo pod belongs.

UK SORA cannot be used to carry people, or for operations over assemblies of people with an aircraft of 3 m or more in characteristic dimension, and aircraft larger than 40 m are outside its policy. If the final ground risk class is above 7, the CAA may direct you to the Certified category.

Under EASA rules, the design evidence also depends on the SAIL. For SAIL I to III a drone with a class label or a declaration of compliance can be used, though the national authority may still ask for a Design Verification Report (DVR) for some technical mitigations and enhanced containment. For SAIL IV, EASA offers the DVR, a report it issues to show the design meets the relevant safety objectives. For SAIL V and VI, the drone must hold a type certificate under Part 21. A DVR is not a type certificate and is recognized only in EASA Member States.

US: Part 107 limits and the 44807 route

Below 55 pounds, Part 107 has three rules that matter most for load carrying. Before each flight, section 107.49 requires the remote pilot to make sure any object attached or carried by the aircraft is secure and does not adversely affect its flight characteristics or controllability. Section 107.23 bars dropping an object in a manner that creates an undue hazard to persons or property. Section 107.36 bars carrying hazardous material.

At 55 pounds or more, Part 107 does not apply. The FAA's route is a petition for exemption under 14 CFR Part 11 and 49 U.S.C. 44807, followed by a Certificate of Waiver or Authorization (COA) for the airspace, applied for through the FAA's CAPS system. The aircraft must be registered with the FAA before a COA can be issued, and the FAA issues a blanket COA to exemption holders, as appropriate, for flights at or below 400 feet in Class G airspace. The FAA says the 44807 special authority runs until 30 September 2033. Our Section 44807 guide covers the petition in detail.

The proposed Part 108 rule for beyond visual line of sight operations would also cover heavier aircraft, but as of October 2026 it is still only a proposal. Check the Federal Register before you plan around it.

Planning the lift: load risk, release, site and crew

A carried load adds its own ground risk. If it comes loose it falls whether or not the aircraft does, and a load hung on a line can swing, catch on structures or change how the aircraft handles in wind. A UK SORA application asks for details of the operational volume and ground risk buffer, so show how you have allowed for the load as well as the aircraft. Plan routes so the load does not pass over people who are not involved in the operation.

Releasing a load in flight counts as dropping it. PDRA01 does not allow articles to be dropped, and UK SORA asks for details of any articles you plan to drop and any dangerous goods you will carry. If your hook or winch can release the load, including in an emergency, describe when and how, and confirm early with the CAA how it will be treated. Our dropping and dispensing guide covers release mechanisms, drop zones and dangerous goods.

UK SORA's objectives for the crew cover training and currency, coordination between crew members and fitness to operate, with more evidence needed as the SAIL rises. On a heavy lift the crew often includes people on the ground who attach and receive loads, so include them in your procedures and training records. A lift plan usually covers:

  • The pick-up and set-down areas, and how they are kept clear while a load is moving
  • Who controls access to the site, and how they talk to the remote pilot
  • Wind limits for the aircraft with the load attached, and when to stop
  • Checks on hooks, lines, slings and attachment points before each lift
  • What the crew does if the load swings, snags or will not release
  • Agreement with whoever controls the site about their own safety rules

What a consultant does, and what to ask before hiring

A consultant can help you work out which route applies to your aircraft and load, build the UK SORA, EASA SORA or 44807 application, describe the load and any release in a way the regulator can assess, and write the lift procedures and crew training. They cannot grant an authorization or exemption or promise an outcome: the regulator decides. Consultants listed on DOC are vetted (identity, legal entity, sanctions screening and professional indemnity insurance), and regulator experience is shown as verified only where it has been evidenced.

  • Have you worked on applications for aircraft of 25 kg (or 55 pounds) or more, and with which regulator?
  • How would you present a slung load and its release mechanism in our application?
  • What design evidence do you expect our aircraft to need at the SAIL our operation is likely to reach?
  • Will you write the lift plan and ground crew procedures, or review ones we draft?
  • What will we need to keep doing once approved, such as maintenance records and checks on lifting gear?

Common mistakes

Each of these can delay an application or leave an operation outside what was authorized:

  • Checking the drone's empty weight against the 25 kg or 55 pound limit, instead of its maximum take-off mass (or, in the US, its weight with the load)
  • Fitting a winch, hook or cargo pod without listing the modification in the application
  • Treating an emergency load release as a technical detail when it means dropping an article
  • Sizing the ground risk buffer for the aircraft alone and ignoring where a detached or swinging load could fall
  • Applying for a Part 107 waiver for an aircraft of 55 pounds or more, which Part 107 does not cover
  • Leaving the ground crew who attach loads out of the procedures and training records

Common questions

Do I need an operational authorization for a drone of 25 kg or more in the UK?

Yes. The Open category only covers drones with a maximum take-off mass of less than 25 kg, and the CAA says you must get its authorization to fly a drone that weighs 25 kg or more. PDRA01 stops below 25 kg, so a heavier aircraft needs a UK SORA application. UK SORA has been the route for new applications since 23 April 2025.

Does the load count towards the 55 pound Part 107 limit?

Yes. Part 107 defines a small unmanned aircraft as one weighing less than 55 pounds on takeoff, including everything on board or attached to it. A drone that is under the limit empty can go over it once the load is attached. At 55 pounds or more, Part 107 no longer applies and the usual route is a Section 44807 exemption followed by a COA.

Does UK SORA use the drone's weight to set the ground risk?

Only at the lightest end. The intrinsic ground risk class comes from the aircraft's maximum characteristic dimension, its maximum speed as specified by the designer, and the population density. Aircraft of 250 g or less with a low maximum speed get the lowest class. For a heavy-lift aircraft, size and speed drive the result, and the load should be reflected in the operational volume and ground risk buffer.

Is an emergency load release treated as dropping?

Releasing a load in flight is a drop. In the UK, PDRA01 does not allow articles to be dropped, and UK SORA asks for details of any articles you plan to drop. If your system can release the load, including in an emergency, describe when and how in the application and confirm early with the CAA how it will be treated. In the US, Part 107 bars dropping objects in a way that creates an undue hazard.

What design evidence does EASA expect for a heavy-lift drone?

It depends on the SAIL your SORA produces. At SAIL I to III a drone with a class label or a declaration of compliance can be used, though the national authority may ask for a Design Verification Report for some mitigations. At SAIL IV, EASA offers a Design Verification Report. At SAIL V and VI the drone must hold a Part 21 type certificate. A Design Verification Report is recognized only in EASA Member States.