UK BVLOS Milestone OAs 2025-2026 — Insurance Impact

What milestone OAs are and why they matter for insurance

The CAA introduced the milestone OA concept as a structured, evidence-based pathway for operators whose BVLOS ambitions exceed what a standard Specific category OA can accommodate. Rather than issuing a single blanket authorisation, the CAA grants permissions in stages — each milestone unlocking a broader operational envelope once the operator demonstrates competency, safety case maturity, and technical reliability at the preceding level. The governing instruments are CAP 722 (the CAA's overarching UAS policy framework) and CAP 2363 (the dedicated BVLOS guidance), both of which set out the evidence standards an operator must meet at each milestone stage.

For insurance purposes, the milestone structure is significant because the risk profile changes at each stage. An operator flying a contained, low-altitude BVLOS corridor over segregated land presents a different liability exposure than the same operator, six months later, flying the same aircraft over mixed rural and peri-urban terrain under an extended milestone. Underwriters need to see the current milestone conditions document, not just the original OA letter, when assessing or renewing a programme.

The UK CAA applies its own Specific category framework, derived from the Air Navigation Order 2016, and is not bound by EASA regulations post-Brexit. EASA's SORA (Specific Operations Risk Assessment) methodology governs Specific category operations across EU member states and is a useful comparator for operators who also hold EASA authorisations, but it has no jurisdiction over UK operations. Operators conducting cross-border trials under bilateral arrangements should confirm with their broker whether a single policy can satisfy both the CAA's requirements and EASA's SORA-derived framework, or whether separate limits are required.

Regulatory thresholds and the OA application process

Within the UK Specific category, aircraft mass is a primary risk classifier. Operations involving unmanned aircraft with a maximum take-off mass (MTOM) above 25 kg attract additional requirements from the CAA, including more detailed safety case evidence and, in practice, closer underwriter scrutiny of structural integrity and failure-mode analysis. Below 25 kg, the Specific category still requires a full OA, but the evidence burden and the insurance market's appetite differ meaningfully from heavier platforms. Brokers should confirm the MTOM of every aircraft on the schedule and flag any that cross this threshold.

The CAA's OA application process for milestone operations follows a defined sequence that brokers should understand in order to request the right documents from clients. The operator must submit an Operational Safety Case (OSC) — the primary safety argument document — alongside a Concept of Operations (ConOps) that describes the intended operation in sufficient detail for the CAA to assess ground and air risk. The CAA then issues the OA with attached conditions if the safety case is accepted. Brokers placing milestone OA programmes should request the OSC executive summary, the ConOps, and the issued OA conditions document as the minimum submission package.

The Air Navigation Order 2016 is the primary legislative instrument under which the CAA issues OAs. It establishes the CAA's authority to set operating conditions and to vary or revoke an OA if those conditions are not met. Insurance programmes should be structured to respond to the OA as issued under the ANO 2016, and any mid-term variation to the OA — whether operator-requested or CAA-directed — should be treated as a material change requiring immediate insurer notification.

• 25 kg MTOM threshold: operations above this mass attract additional CAA requirements and heightened underwriter scrutiny
• OSC (Operational Safety Case): the primary safety argument document; brokers should request the executive summary at submission
• ConOps (Concept of Operations): describes the intended operation; essential for underwriters assessing ground and air risk class
• Issued OA conditions document: the definitive statement of what is and is not authorised; must be current at each renewal
• Air Navigation Order 2016: the primary legislative instrument under which all CAA OAs are issued

How BVLOS operational conditions drive underwriting requirements

Underwriters assess BVLOS risk across several axes that are directly shaped by the conditions attached to a milestone OA. The key variables include the ground risk class of the operating area (populated versus sparsely populated), the air risk class (segregated versus non-segregated airspace), the detect-and-avoid or detect-and-alert solution in use, and whether the operation is conducted with a remote pilot in command or under a higher level of autonomy. Each of these factors influences both the liability limit that a sensible programme should carry and the deductible structure the underwriter will propose.

Premiums scale with hull value and BVLOS exposure. A high-value fixed-wing platform operating long-corridor BVLOS under a milestone OA will attract a materially different rate than a multirotor conducting short-range BVLOS within a geo-fenced industrial site. Deductibles typically rise on autonomous operations where human intervention in the control loop is reduced, because loss-causation investigations are more complex and contested. Operators should budget for this when modelling the commercial case for a BVLOS service.

The CAA does not prescribe a fixed minimum third-party liability limit in GBP for Specific category operations in the way that some other regulatory frameworks specify minimum cover. However, the CAA expects operators to carry limits commensurate with the realistic third-party exposure of the operation. For BVLOS over or near populated areas, industry benchmark limits recommended by specialist brokers are substantially higher than those typical for a standard VLOS Specific category flight. Brokers placing milestone OA programmes should document the rationale for the limit selected in the placement file, referencing the ground risk class and population density of the operating corridor.

• Ground risk class: populated corridors require higher third-party liability limits than segregated rural routes
• Air risk class: non-segregated airspace operations may require aviation liability extensions covering mid-air collision with manned aircraft
• Autonomy level: reduced human-in-the-loop increases underwriter scrutiny of software validation and failure-mode documentation
• Hull value: replacement cost of the platform, payload, and ground control infrastructure should all be scheduled
• Detect-and-avoid solution: CAA-accepted DAA or DAA-lite systems can positively influence underwriting terms

The 2025-2026 milestone pipeline and broker workflow

The 2025-2026 period represents a material step-up in UK BVLOS activity as operators who received early milestone OAs progress to broader operational envelopes. Publicly documented activity in this space spans long-linear infrastructure inspection, logistics and delivery trials in defined corridors, and emergency-services support operations. Brokers should not assume that an operator's existing Specific category policy extends to cover a new or progressed milestone without explicit confirmation from the underwriter.

For brokers, milestone OA risks are not standard Specific category risks that can be quoted from a rate card. Each requires a manuscript or near-manuscript policy form and a detailed submission. A complete submission should include: the issued OA conditions document, the OSC executive summary, the ConOps, the aircraft and ground control station schedule with replacement values, the DAA or detect-and-alert solution description, remote pilot training and competency records, the proposed operating area or corridor description, and the broker's written rationale for the third-party liability limit being sought. Underwriters active in this space will ask for all of these at first submission; incomplete packages are the primary cause of delayed or declined quotations.

On a complete and well-prepared submission, specialist underwriters in the UK BVLOS market can typically provide indicative terms within five to ten working days. Submissions that arrive without the OSC, ConOps, or current OA conditions document routinely take longer and may require a formal request for information before the underwriter can engage. Brokers who build a standardised milestone OA submission checklist into their client onboarding process will consistently achieve faster turnaround and better market engagement.

Policy structure, named exclusions, and compliance checkpoints

A well-structured milestone OA insurance programme typically combines hull all-risks cover for the unmanned aircraft system (including ground control station and datalink equipment where these have material value), third-party liability, and — where the operation involves payload delivery or data collection under contract — a consideration of whether cargo liability or professional indemnity extensions are needed. Policy wording must be reviewed against the specific conditions of the milestone OA to identify exclusion triggers before they become claims disputes.

Common exclusions in Specific category BVLOS policies that operators and brokers should review carefully include: exclusion for any flight conducted outside the geographic boundary defined in the OA conditions; exclusion for operation without a serviceable DAA or detect-and-alert system where the OA requires one; exclusion for flight at an MTOM or in an airspace class not covered by the issued OA; and exclusion for operations conducted by crew whose competency records do not satisfy the OA conditions. Where any of these exclusions could be triggered by a foreseeable operational scenario — for example, a temporary DAA system fault — the broker should negotiate appropriate wording at placement rather than relying on a post-loss argument.

Compliance checkpoints with direct insurance implications include annual or biennial OA reviews, milestone progression assessments, and any CAA-directed safety directives following an occurrence. A milestone progression is a material change to the risk: the moment the CAA issues an updated OA document extending the operational envelope, the operator is obliged under standard policy conditions to notify the insurer immediately — not at the next renewal. Brokers should build a compliance calendar into their client management process, flagging OA review dates and any known regulatory consultations that may alter operating conditions. Post-Brexit, UK operators are not subject to EASA regulations, but those conducting operations in EU airspace, or seeking to demonstrate equivalence for EU-based commercial contracts, may need to satisfy both the CAA's Specific category requirements and EASA's SORA-derived framework; the insurance programme should be structured accordingly.

• Exclusion for flight outside the OA geographic boundary: confirm the policy responds to the full corridor, not just the base of operations
• Exclusion for operation without a serviceable DAA system: negotiate wording for temporary technical faults handled under the operator's SMS
• Exclusion for MTOM or airspace class not covered by the OA: verify the schedule matches the OA conditions exactly
• Exclusion for crew whose competency records do not satisfy OA conditions: maintain current training records and make them available to the insurer on request
• Mid-term material change obligation: milestone progression triggers immediate notification, not renewal-date notification

Frequently asked questions

Does a standard Specific category drone policy cover BVLOS operations under a milestone OA?

Not automatically. Standard Specific category policies are typically rated and worded for VLOS or short-range VLOS operations. A milestone OA introduces operating conditions — extended range, non-segregated airspace, reduced human oversight — that may fall outside the policy's geographic, operational, or technical scope. Present the full OA conditions document to your broker and confirm in writing that the policy wording responds to each condition before flying under the milestone.

Which operators are eligible to place a milestone OA insurance programme?

Eligibility is determined by the underwriter, not by the CAA. Underwriters active in this space will typically require: a valid CAA milestone OA with current conditions attached, a documented safety management system, evidence of remote pilot competency appropriate to the operation, a technical specification for each aircraft on the schedule including MTOM, and a loss history for any prior BVLOS or Specific category operations. Operators still in the OA application phase can approach the market for indicative terms, but binding cover will require the issued OA.

What documents should a broker include in a milestone OA submission to underwriters?

A complete submission should include the issued CAA OA document with all attached conditions, the Operational Safety Case (OSC) executive summary, the Concept of Operations (ConOps), the aircraft and ground control station schedule with replacement values, the DAA or detect-and-alert solution description, remote pilot training and competency records, the proposed operating area or corridor description, and the broker's written rationale for the third-party liability limit being sought. On a complete submission, specialist underwriters can typically provide indicative terms within five to ten working days. Incomplete submissions are the primary cause of delays.

Does the CAA prescribe minimum third-party liability limits for Specific category BVLOS operations?

The CAA does not prescribe a fixed minimum liability limit in GBP for Specific category operations. However, it expects operators to carry limits commensurate with the realistic third-party exposure of the operation. For BVLOS over or near populated areas, specialist brokers recommend limits substantially higher than those typical for standard VLOS Specific category flights. The broker should document the rationale for the limit selected — referencing the ground risk class, population density, and air risk class of the operating corridor — in the placement file.

When does a milestone progression trigger a mid-term policy notification?

A milestone progression is a material change to the risk. The moment the CAA issues an updated OA document extending the operational envelope — whether that means a new geographic area, a higher air risk class, or a change to the autonomy level — the operator is obliged under standard policy conditions to notify the insurer immediately. Failure to notify can result in claims being assessed against the original, narrower risk profile. Brokers should advise clients to notify on receipt of the updated OA, not at the next renewal.

Does a UK milestone OA insurance programme satisfy regulatory requirements in other jurisdictions?

A UK-placed policy satisfies CAA requirements for UK airspace under the Air Navigation Order 2016. It does not automatically satisfy EASA requirements for EU airspace, FAA requirements for US airspace, or GCAA requirements for UAE airspace. Post-Brexit, EASA has no jurisdiction over UK operations; its SORA-derived framework applies only in EU member states. Operators conducting BVLOS operations in multiple jurisdictions need to confirm with their broker whether the policy can be endorsed to extend cover, or whether separate local placements are required.