Key terms and definitions used in wind turbine blade inspection, repair operations, and field service management.
Progressive surface degradation of the blade's leading edge caused by rain, hail, salt spray, sand, or insect impact over time. Leading edge erosion (LEE) is one of the most common blade damage types, particularly on offshore turbines. Left untreated, it reduces aerodynamic efficiency and annual energy production (AEP) by up to 5%. Repairs typically involve surface preparation and application of protective coatings or leading edge protection (LEP) systems.
The systematic examination of wind turbine blades to identify damage, wear, and defects. Methods include ground-based visual inspection (using telephoto cameras or binoculars), up-tower rope access inspection, drone-based inspection using UAVs with high-resolution cameras, and internal blade inspection. Each method produces a detailed condition report with photographic evidence, damage classification, and recommended repair actions.
The process of restoring a damaged wind turbine blade to serviceable condition. Repairs are categorised by severity: minor repairs include gel coat touch-ups and small surface fills; major repairs involve structural laminate work such as spar cap repairs, trailing edge bond line repairs, or root section reinforcement. All repairs require documented procedures, photographic evidence (before, during, and after), and sign-off by qualified technicians.
The separation of composite laminate layers within a blade structure. Delamination can occur due to manufacturing defects, fatigue, lightning strikes, or moisture ingress. It is a structural concern that typically requires ultrasonic testing (UT) or tap testing for detection, followed by repair involving removal of damaged material, re-lamination, and curing. Common locations include trailing edge bond lines and spar cap-to-shell transitions.
The outermost protective layer of a wind turbine blade, typically a polyester or polyurethane resin coating. The gel coat provides UV protection, weatherproofing, and surface finish. Gel coat damage — including cracks, chips, and erosion — is the most frequently recorded blade defect type. Repairs involve surface preparation, filler application, gel coat reapplication, and sanding to restore the original surface profile.
Systems and coatings applied to the leading edge of wind turbine blades to prevent erosion damage. LEP solutions include polyurethane tape, elastomeric coatings, and pre-formed shell systems (e.g. Polytech, 3M, Belzona). Application can be performed up-tower via rope access or down-tower when the blade is removed. LEP application is a common preventive maintenance activity in blade service campaigns.
An integrated system of receptors, down conductors, and earthing connections within a wind turbine blade designed to safely conduct lightning strike energy to ground. LPS testing and verification is a standard part of blade inspection and post-lightning-strike assessment. Damage to LPS components — such as receptor erosion, conductor discontinuity, or bonding failure — requires specialist testing and repair. LPS compliance is typically required by turbine OEM warranty conditions.
The primary structural element running along the length of a wind turbine blade, typically made from unidirectional glass fibre or carbon fibre composite. The spar cap carries the main bending loads on the blade. Spar cap defects — including wrinkles, delamination, and cracks — are classified as major structural findings and require specialist repair procedures, often with OEM involvement.
The narrow aft edge of a wind turbine blade where the upper (suction) and lower (pressure) surfaces meet. The trailing edge bond line is a common location for cracking, opening, and adhesive failure. Trailing edge repairs are among the most frequently performed blade repair activities and range from simple adhesive re-bonding to structural reinforcement with additional laminate layers.
The complete wind turbine assembly including the rotor (blades and hub), nacelle (housing the drivetrain, gearbox, and generator), tower, and foundation. WTG is the standard industry abbreviation used in project documentation, service contracts, and operational reporting. Major WTG manufacturers (OEMs) include Vestas, Siemens Gamesa, GE Vernova, Nordex, Enercon, and Goldwind.
An organised programme of blade inspection and/or repair work across multiple turbines, typically at one or more wind farm sites. Campaigns are planned and managed by blade service contractors on behalf of asset owners or OEMs. A campaign involves mobilisation of technician teams, equipment logistics, task scheduling per turbine, daily progress reporting, and client deliverables such as condition reports and completion certificates.
The coordination and management of service personnel and resources deployed at remote wind farm locations. In wind energy, FSM encompasses technician scheduling, timesheet management, task assignment, materials tracking, quality assurance, and real-time progress reporting. Software platforms like Collabaro digitise these processes to replace paper-based systems and manual spreadsheet tracking.
The process of deploying (mobilisation) and withdrawing (demobilisation) technician teams, tools, and equipment to and from a wind farm site at the start and end of a service campaign. Mob/demob costs — including travel, accommodation, and equipment transport — are a significant component of project budgets and are typically billed separately from on-site labour.
The ongoing activities required to keep a wind farm operating at peak performance after commissioning. O&M encompasses scheduled maintenance (preventive), unscheduled repairs (corrective), condition monitoring, blade inspection, and performance optimisation. O&M contracts are the primary commercial framework under which blade service contractors operate, typically structured as long-term service agreements (LTSAs) with asset owners.
A method of reaching wind turbine blade surfaces for inspection and repair by suspending technicians from ropes attached to the nacelle or hub. Rope access is the most common method for up-tower blade work and requires IRATA (Industrial Rope Access Trade Association) or SPRAT certification. Rope access technicians perform visual inspections, surface repairs, LEP application, and LPS testing while suspended at heights of 80-170 metres.
Collabaro's configurable workflow engine that guides technicians through structured task sequences on their mobile device. SmartTasks can include step-by-step instructions, mandatory photo capture points, measurement fields, pass/fail checkpoints, conditional branching (e.g. different steps for different damage types), and digital sign-off requirements. SmartTasks ensure every repair is performed and documented to a consistent standard.
The process of validating technician-reported working hours against objective evidence. In wind energy field service, this typically involves GPS location stamps (confirming the technician was at the wind farm), clock-in/clock-out timestamps, and project manager review and approval. Verified timesheets are critical for accurate billing, cost control, and compliance with working time regulations.
A short, focused safety briefing conducted at the start of each work shift or before a specific task begins. In wind energy field service, toolbox talks cover site-specific hazards, task-specific risks, weather conditions, emergency procedures, and PPE requirements. Digital toolbox talks — with attendance recording and acknowledgement sign-off — are increasingly replacing paper-based versions for compliance and audit purposes.
Terms describing where blade service work is performed. Up-tower work is done with the blade installed on the turbine, typically via rope access or platform systems. Down-tower work is done with the blade removed and placed on ground supports. Up-tower is more common for inspections and minor repairs; down-tower is used for major structural repairs or when the blade has been removed for other reasons (e.g. transport damage).
A chronological record of all actions, changes, and approvals made within a project management system. In wind energy blade service, the audit trail captures who performed each task, when it was done, what evidence was recorded, and who approved the work. A complete audit trail is essential for demonstrating compliance with client standards, OEM warranty requirements, and regulatory obligations.
A formal document produced after blade inspection that details the current state of each blade. Condition reports typically include blade identification (turbine number, blade position, serial number), a damage map showing defect locations, photographic evidence of each finding, severity classification, and recommended actions. Condition reports are a primary deliverable in blade inspection contracts and serve as the basis for repair planning.
A standardised system for categorising blade defects by type and severity. Common classification schemes range from Category 1 (minor cosmetic damage, monitor) to Category 5 (critical structural damage, immediate action required). Classification determines repair priority, method, and timeline. Standardised classification ensures consistent assessment across different inspectors, sites, and campaigns.
An international certification and classification body that sets widely adopted standards for the wind energy industry. DNV standards relevant to blade service include DNVGL-ST-0376 (Rotor Blades for Wind Turbines) and DNVGL-SE-0441 (Type and Component Certification of Wind Turbines). DNV certification is frequently referenced in asset owner contracts as the benchmark for blade condition assessment and repair quality.
Health, Safety, Environment, and Quality — the four pillars of compliance management in wind energy operations. Blade service contractors maintain HSEQ management systems covering risk assessments, method statements, incident reporting, environmental impact mitigation, and quality control procedures. HSEQ compliance is a prerequisite for working on most wind farm sites, with requirements varying by asset owner and region.
The international body that sets standards and certification levels for industrial rope access work. IRATA certification (Levels 1, 2, and 3) is the most widely recognised qualification for wind turbine blade technicians performing up-tower work. Level 1 covers basic rope access; Level 3 qualifies for supervision. Most blade service contracts require IRATA certification as a minimum personnel qualification.
The International Electrotechnical Commission standard series covering wind turbine design, safety, and testing. IEC 61400-24 specifically addresses lightning protection for wind turbines, including blade LPS design and testing requirements. Compliance with IEC 61400 standards is referenced in turbine type certification and influences blade service and inspection protocols.
The web-based application within the Collabaro platform, designed for project managers and office-based personnel. Collabaro Desk provides project dashboards, GPS-verified timesheet review, drag-and-drop report design, workflow configuration, cost management, and real-time visibility across all active wind service campaigns. Accessible from any modern web browser without installation.
The mobile application within the Collabaro platform, designed for wind turbine technicians working at wind farm sites. Collabaro Field enables GPS-stamped timesheet logging, step-by-step checklist completion, photographic evidence capture, and digital sign-off — all with full offline capability. Available for iOS and Android devices. Data syncs automatically to Collabaro Desk when connectivity is restored.
A timesheet record that includes GPS location coordinates captured at clock-in and clock-out times, providing objective evidence that the technician was at the specified wind farm location during the reported working hours. GPS verification eliminates timesheet disputes, supports accurate billing, and provides audit-grade evidence for client invoicing.
A software design approach where the mobile application functions fully without an internet connection. In wind energy field service, reliable connectivity at remote onshore and offshore wind farm sites cannot be guaranteed. Offline-first architecture ensures technicians can log timesheets, complete checklists, and capture photos regardless of signal availability. All data is encrypted locally and syncs automatically when connectivity resumes.
GPS-tagged, timestamped photographs captured during blade inspection and repair activities as proof of work performed. Photographic evidence typically documents the condition before work, during critical process steps, and after completion. In Collabaro, photo capture points can be made mandatory within SmartTask workflows, ensuring consistent documentation standards across all technicians and sites.
The computerised system that monitors and controls wind turbine operations in real time. SCADA data includes turbine status (operating, stopped, curtailed), power output, wind speed, component temperatures, and alarm events. While SCADA focuses on turbine performance monitoring, field service management platforms like Collabaro focus on the human operations layer — managing the people, tasks, and documentation that SCADA cannot capture.
A field of artificial intelligence that enables machines to interpret and extract meaning from photographs and video. In wind turbine blade inspection, computer vision is used to detect, locate, and classify surface defects — including erosion, cracks, delamination, and coating failures — from inspection images. Collabaro's AI capabilities are grounded in computer vision research conducted in partnership with Loughborough University between 2019 and 2023.
The process of describing a structural defect through a consistent set of measurable attributes — including size, shape, colour, position, and severity. In blade inspection, standardised defect characterisation enables damage data from different platforms, drones, or inspectors to be compared objectively. Collabaro's research introduced DefChars: a system of 38 morphological features for characterising blade defects with machine-readable precision.
An artificial intelligence system that processes and reasons across multiple types of input simultaneously — such as text, images, and structured data. In blade inspection reporting, multimodal AI enables damage data to be extracted from reports that combine photographs, handwritten notes, and structured tables. Collabaro uses a multimodal approach to extract and structure damage records from any report format, regardless of which inspection platform or drone provider produced it.
A numerical or visual indicator of how certain an AI system is about a particular output. In Collabaro's BLADE™ feature, every data point extracted from a paper inspection board photograph is assigned a traffic-light confidence score — green for high confidence, amber for moderate, and red for low. This allows technicians to quickly identify which extracted entries need manual verification before the data is committed to a project record.
A type of AI system trained on large volumes of text data, capable of understanding and generating language, and of reasoning across complex, unstructured inputs. In field service management, LLMs enable practical applications such as extracting structured damage records from free-text inspection reports and interpreting mixed-format documents. Collabaro applies LLM technology within its damage extraction workflow to handle the wide variety of report formats produced by different inspection platforms and drone providers.
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