Wind blade structural composite repair

Repairs on Wind blades are not a common standard in the industry, and every Wind blade manufacturer has his Structural Repair Manual which has to be followed.
In this course, you will learn methods of repair smart prepared layup, by elevated heat, use of a vacuum which will simplify your work and cut cost by saving time and error.

This course is developed EFC  from our experience in the field of damage assessment and repair.
EFC owner Bert Groenewoud and Instructor Robert Otterspoor, have a lot of knowledge and hands-on experience in NDI Damage assessment, report writing, repair, and post-repair inspection, all gained during wind blade repair project(s) such as Vestas in the Philippines.

EFC owner Bert Groenewoud and Instructor Robert Otterspoor, have a lot of knowledge and hands-on experience in the repair of Wind Turbine Blade such as; NDI, Damage assessment, report writing, repair, and post-repair inspection, all gained during wind blade repair projects for Vestas in the Philippines.

All experience gained on onsite wind blade repair projects for Vestas for instance in the Philippines. (Click here to See EFC’s portfolio).

Day(-s): 5 / Tech code: TECH-260

No previous experience in composite repair is required, but the EFC TECH 001, our Basic Composites course is recommended for basic knowledge, or an equivalent level of experience in composite materials and repair would benefit participants in this course.

English understanding, reading and writing skills
It is important that you have an adequate level of understanding and reading technical English for reading manuals, drawings, and instructions used during this course.

We as EFC in this course do NOT practice Wind Turbine blade climbing techniques and a do not hand out a climbing certificate!

Our partner in climbing training is AIRAS  They can take care of your climbing permit

Please contact Airas or EFC for more information if needed.

This course is developed for anyone from an inspector to a technician in the field, to learn about the principles of Wind Turbine blade repairs. Repairs on Wind blades are not a universal standard in the industry, and every Wind blade manufacturer has his own Structural Repair Manual which has to be followed

In this course, the students will determine damage to Fiber Reinforced Plastic (FRP) sandwich panels and then will perform damage removal and proper repair preparation. The participant teams will perform repairs to reconstruct the damaged areas in order to match the fiber axial loads through the damaged area in the structure. And avoid stress in the repaired blade/panel

This course is designed and utilizes a team effort repair concept similar to as in the field.
Participants of this course will if possible be grouped in teams of two to work together on their project.

The participant you will perform a damage assessment, removal en surface prep. of the sanded repair area
You will be introduced to new ways in repair using, prepared pre-impregnated wet layup repair sets, use of autonomous heat blankets, and heat consoles and instructions of   hoisting techniques and application of hoisting complete layup sets to the blade damaged area


Minimum required 4 and maximum 8 per course*.

* Courses will be confirmed as running by EFC as soon as sufficient applications are received!

To provide participants with the theoretical knowledge and practical Hands-On skills necessary to carry out the repair on turbine wind blades

At the end of the course the participants:

  • Must be able to work independently and in a team of two participants with minimum supervision
  • Must be attentive to details
  • Can work according to Safety regulations and recognize hazardous situations & materials
  • Can work with the Wind blade OEM manuals in the repair of wind blades
  • Can read OEM (Original Equipment Manuafacturer) Windblade lay-up drawings f
  • Knows how to work with dry glass fabric and liquid Epoxy resin to impregnate wet in wet (Wet Lay-Up)
  • Can perform damage assessment, plan the work and work as planned
  • Can find steps of repair to be taken in the Wind turbine blade related OEM manuals 
  • Can repair double curved Glass fiber panels with Nomex® honeycomb and foam core
  • Performs ‘Wet Lay Up’ repairs on sandwich panels from the outside
  • Can apply fundamental vacuum bagging, bleeder & breather concepts
  • Must be able to understand and read technical Englisch as written in the SAE- CACRC AIR 4448 and Composite and Bonded Glossary.

  • Health and Safety during climbing
  • Blade structure and ply layup drawings
  • Types of resin, gel-coat, paints and their properties
  • A damage assessment
  • NDI, Non-Destructive inspection 
  • Dolphicam use for damage assessment
  • ve visual  Inspection by tapping 
  • t by photography and Drones
  • Cure and post-cures of material used
  • Basic material used, release films, perforated and
  • Exothermic reactions and safety precautions
  • Repair types and sequence 
  • Taperssand repairs by orbital sanders
  • Autonomous heat blankets for wind turbine blade repairs
  • Mini hot bond heat consoles and special heating  blankets for Wind turbine blade by GMI Aero
  • Portable Vacuumpumps and long hoses
  • Moisture meter use
  • Fiber Drying methods for blade repairs
  • OEM blade production repair manuals and layup drawings
  • Sanding with orbital disk sanders
  • Damage Report writing
  • Lightning Strike repair
  • Erosion leading edge (Leeward & windward side  repair )
  • Trailing edge repair 
  • Nose Cap repair
  • Post repair Inspection
  • Safety‚Äč

(Level 1-3)

Participants will be intensively monitored while repairing reinforced fiber laminates from sandwich parts and
low temp  Lay-Up of vacuum materials and perform vacuum leak checking and hot curing with autonomous heat blankets.

  • Damage assessment and reporting
  • Repair type and repair sequence
  • Determine ply directions in fiber laminates by sanding.acc  technical data drawings/ blueprint if  available
  • Damage removal, scarf preparation by orbital sanding using a Wet Lay-
  • Remove moisture by dry cycle under vacuum and heat
  • Cure and/or post-cure with autonomous heat blankets
  • Introduction Hot Bond repair consoles and their heating equipment use on wind turbine blades.
  • Performs necessary ‘Wet Lay Up’ repairs on like lightning strikes, eroded damaged leading edges, trailing edge impact damage.or bird strike repair

  • Multiple choice questions from each of the teachings Level 1-3
  • Successful completion is 75% correct answers
  • The examination will be closed book and  can be conducted by a Part 147 approved Examiner upon request
  • The practical mark will be the average of all marks gained from the practical exercises
  • All grades will be recorded in the participant individual training records and kept on record at EFC for unlimited time (compliant with Reference EASA Commission Regulation (EU) No 1321/2014) and the GDPR rules
  • A certificate of accomplishment is handed out to each participant along with a print out of  the course content
  • Assessment activities are built into our courses, to give feedback on the achievement and personal potential and kept a record in their personal logbook.
  • The final outcome of the participant's Examination, assessment document and logbook per student will be digitally sent to you or your company responsible manager, HR or training department.
  • We also comply with the European  GDPR rules as effective on May 25th, 2018 concerning storage of private information of participants who attended our courses.

This course can also be held at our facility in Leipzig Germany at the facilities of our partner HEICO. If you have a need for this, please contact our purchasing manager Rolf Hovener via his page.

For your company to benefit, this course can be held ‘On-Site’ at your facility under certain conditions.
Click on this link to the Onsite information webpage!

Courses as noted on our course schedule page can be run on request to meet your required start and end date.

All listed course prices are Excl VAT. (Dutch VAT is 21%). EFC complies with Dutch tax laws. On request, companies can be sent an invoice instead of paying direct On-line with PayPal, IDEAL or credit card.

Payment is securely arranged via . More information can be found on the website of Mollie.

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There are no dates planned yet, if you are interested in this course, please contact us?