Northon performs wind turbine blade inspections by rope access, from service platforms and with drone support. Each inspection concludes with structured records, a damage map and clear recommendations for the next action.
Reliable condition assessment before repair and maintenance planning.
A blade inspection establishes the actual condition of the surface, leading and trailing edges, tip, joint areas and visible lightning-protection components. A systematic review helps distinguish minor coating defects from indications that call for closer diagnostics or service intervention.
The scope follows the turbine type, operating history, previous reports and the purpose of the assignment. It may be a periodic inspection, post-work acceptance, verification of a specific indication or a survey after an operational event. Every finding is tied to an unambiguous location and photographic evidence.
01 / A local defect documented with a measurement scale to establish its size and position unambiguously.
02 / Extensive blade-tip damage recorded with a measurement scale for classification and repair planning.
Blade condition assessment
What indications do we identify?
We assess visible signs of surface and structural degradation, measure their extent and assign a blade location. Classification and action priority follow the agreed reporting standard and project requirements.
leading-edge erosion, coating wear and gelcoat or topcoat loss
cracks, scratches, chips, discolouration and impact marks
visible indications of delamination, debonding and adhesive-joint damage
damage to the trailing edge, blade tip and aerodynamic profile
abnormalities around receptors and visible lightning-protection components
signs of moisture, contamination, overheating or previous repairs requiring review
Inspection methods
Access and inspection technique selected for the objective.
No single method provides the same level of detail in every situation. We combine the appropriate access method with photographic and measurement records to provide information that supports a service decision.
01 / DIRECT ACCESS
Rope access and platforms
Direct access enables close visual examination, measurement of defect length and width, tactile surface checks and repeatable scale photographs. It is particularly valuable when detailed classification or repair-scope preparation is required.
02 / AERIAL IMAGING
Drone-assisted inspections
A drone can efficiently capture imagery of the complete blade without direct technician access to the surface. Blade zones are recorded in a structured sequence, after which the images are reviewed, findings located and areas requiring close-up verification selected. Standard RGB imagery documents visible surface changes and does not replace examination for hidden subsurface defects.
Inspection workflow
From inspection plan to final report.
01
Scope definition
We establish the objective, turbine type, blade identification, required classification standard and available records from earlier inspections.
02
Access and safety plan
Rope access, platform, drone or an agreed combination is selected for site conditions and operational constraints.
03
Systematic capture
Surfaces and characteristic zones are examined in a defined root-to-tip sequence using consistent image identification.
04
Measurement and mapping
The location, orientation and dimensions of each indication are recorded and placed on a blade map.
05
Classification
Finding type and extent are described and an action priority assigned against the approved project criteria.
06
Record verification
We confirm image quality, completeness and traceability to turbine, blade, surface and position.
07
Report and recommendations
Results are delivered with photographs, a damage map and recommendations for further diagnostics, monitoring or repair.
Blade-tip damage documented from a service platform with a scale and reference point.
Measurement of coating loss along the blade edge as a basis for damage classification.
Three coating defects documented in one reference system to compare their dimensions and distribution.
Measurement integrity
Measurement conditions matter
Inspection quality depends on visibility, lighting, surface cleanliness, platform stability and weather. Drone imagery also depends on distance, viewing angle and capture consistency. For thermography, ambient parameters and the operating state of the tested system are recorded to avoid treating reflections, solar loading or natural surface variation as a fault.
Inspection reporting
Reporting that supports service decisions
Results are organised so the client can compare blade condition, establish priorities and plan the next inspection or repair. The report structure can follow the operator's, wind-farm owner's or project-specific template.
turbine and blade identification, date and inspection method
finding location by blade side, edge and distance reference
overview and detail images and, for direct access, scale measurements
description of finding type, size, class and proposed action priority
recommendation for monitoring, supplementary examination or repair preparation
Detailed blade inspection
Close-up inspection wherever detail is required
When remote imagery cannot support a conclusive assessment, direct inspection verifies the indication, enables accurate measurement and gathers information for repair engineering. Northon teams work from platforms and service access systems and by rope access, selecting the method for the damage location and wind-farm conditions.
Traceable records and structured finding classification.
03 / Inspection of a hard-to-reach blade area near the turbine hub by a rope-access technician.
FAQ
Wind turbine blade inspection FAQ
Which blade inspection method is best?
The method follows the objective. A drone is effective for efficient full-surface imaging, while rope access or a platform enables close measurement and more detailed assessment. A planned combination often provides the most useful result.
Does a drone inspection replace rope access?
Not in every case. A drone can identify and document many surface changes, but it does not provide surface contact or direct measurements at the defect. Ambiguous or significant indications may require close-up verification.
What does the inspection report contain?
The report includes turbine and blade identification, method and inspection conditions, images, finding location and description, measurements or scale, agreed classification and a recommendation for the next action.
When can anti-icing-system thermography be performed?
The survey is planned when sufficient thermal contrast and system-state control can be achieved. Weather, sunlight, wind, blade surface and camera geometry all affect the result, so conditions and interpretation limits are assessed for every assignment.
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