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Part B - Verifications and approval requirements 
4 Rotor/nacelle assembly 
4.1 Preliminary remarks 
Generally, a type certification shall be presented for the planned rotor/nacelle assembly. In the 
case of a pilot installation or a new development for which, due to time restrictions, a type 
certification cannot or cannot yet be issued, it may be permissible to present another suitable 
certificate for obtaining approval for the RNA in exceptional individual cases. The objective of 
the type certification, resp. permissible alternative certification which may be presented in ex 
ceptional cases, is to ensure that the respective turbine type is inspected by an expert with 
the view to confirming that it has been designed and documented in compliance with the un 
derlying standards and guidelines so that it may be manufactured on this basis. Due consid 
eration shall be given to the local marine environment during this process. In order to obtain 
the type certification, proof shall be provided that the offshore operation of the wind turbine 
complies with the respective standards and guidelines. 
As a result, the type certification shall incorporate the following tasks: 
• Design evaluation of the turbine type: 
- Loading assumptions 
- Technical management and safety concept 
- Rotor blades (including static, resp. dynamic blade tests, in as far these are required by 
the type certification guidelines applied) 
- Engine 
- Optionally, tower (not including the substructure, however including the connection to the 
tower and the substructure and their respective properties, in as far as this is required 
with a view to assessing the other components, e. g. stiffness assumptions) 
- Electrical systems and lightning protection, as well as 
- Commissioning inspection for one of the first offshore wind turbines of the tested type. 
• Implementation of the design requirements during the production and installation phase; a 
one-time monitoring and inspection of the production process shall ensure that the design 
requirements specified in the implementation documents with respect to the production 
and installation can be accordingly achieved at the manufacturing company. 
• QM system used by the offshore wind turbine manufacturer: The use of an effective, certi 
fied management system in accordance with ISO 9001 (Quality management systems - Re 
quirements) shall be accordingly verified. Alternatively, should this not be currently availa 
ble, arrangements can be made with the appointed inspector to inspect the quality 
management system on the basis of ISO 9001. 
• Prototype measurements. 
The following measurements, resp. tests, shall be carried out on one of the first prototypes 
(e.g. prototype on land): 
• Loads 
• Performance curve 
• System behaviour. 
Once the type certification has been presented, the project and site-specific inspections shall 
be conducted and the monitoring services provided (please refer to chapter B1).