Wind Turbine Inspection by Drone

With blades often exceeding 60 metres in length and nacelles perched 100 metres high, wind turbine inspection is one of the most natural use cases for professional drones. What once required days of rope access or aerial work platforms can now be completed in a few hours, with superior photographic detail and improved safety for ground crews.

Why drones are the new standard in wind turbine inspection

Traditional inspection methods — rope access (IRATA), elevated work platforms, or visual inspection from the ground with binoculars — all have significant limitations. Rope access exposes technicians to serious height risks and requires full turbine shutdown for several days. Elevated platforms require accessible, stable terrain. Ground-level visual inspection lacks the resolution to detect hairline cracks or internal delamination.

Drones remove these constraints:

• No height access required for operators
• Reduced machine downtime — only the rotor needs to be stopped, not necessarily the nacelle
• High-resolution imagery captured within metres of the blade surface
• Exhaustive, geolocated photographic documentation of every inspection

Defects detected on blades and structures

Visual drone inspection identifies the full range of common wind turbine anomalies:

On blades:

• Leading edge erosion — a progressive phenomenon that degrades the aerodynamic profile and reduces energy yield; detectable from the earliest stages at centimetric resolution
• Superficial and deep cracks — on the leading edge, trailing edge or blade body
• Lightning strike damage — cavities, spalling or charring around lightning protection systems
• Delamination — separation of composite layers, often visible as blistering or colour variation
• Contamination — insects, dust, ice creating aerodynamic disruption

On structures:

• Corrosion on flange bolts and metallic tower surfaces
• Condition of guardrails, platforms and access hatches
• Cracks at tower base and concrete foundation

Inspection workflow

A complete inspection of a 2 to 3 MW wind turbine takes half a day:

1. Safety briefing and coordination with the operator or maintenance contractor — machine lockout, ground safety perimeter
2. Three-blade inspection — systematic overflight protocol covering both pressure and suction faces, with multiple passes at varying distances (overview + high-resolution close-up)
3. Tower and nacelle inspection — circumferential photographic documentation
4. Image processing — sorting, anomaly annotation, localisation on blade diagram
5. Inspection report — defect classification by severity (from observation to immediate corrective action), follow-up recommendations

Comparison with traditional methods

Drone inspection is becoming the industry standard for annual surveillance visits. Rope access is retained for repair operations that require physical contact with the blade.

Regulatory context and industry requirements

Wind turbine inspections form part of the preventive maintenance plans required by OEMs and insurers. They may also be required as part of wind farm transactions or project refinancing.

French regulation requires remotely piloted aircraft to comply with local airspace rules. Our pilots hold the required qualifications (DGAC specific category) to operate near tall structures under applicable regulatory conditions.

Our field approach

We use the DJI Matrice 4TD for wind turbine inspections in high-resolution visible configuration. Its stability in moderate wind and manoeuvrability around complex structures make it well-suited to the constraints of wind farm environments.

We operate on onshore farms of all sizes, in coordination with operators and maintenance teams. Our inspection reports are structured for direct integration into CMMS platforms and preventive maintenance plans.