Part B - Verifications and approval requirements 
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• Machining drawing 
• Test drawing 
• Drawing of the surface treatment 
• Post-treatment specifications 
The regular inspections to be carried out by the appointed inspector during the production 
monitoring phase at the foundry and the sub-suppliers of the respective components include 
the following checks: 
• Inspection of the whole production process (product and process) and the carrying out of 
non-destructive testing 
• Casting date, removal date, removal temperature 
• Chemical composition, as-cast microstructure, mechanical properties 
• Sampling concept (stamping) 
• Requirements of the NDT tests, test personnel 
• Geometric requirements (wall thicknesses, fits, bores etc.) 
• Thickness of the corrosion protection layer 
• Inspection of any other quality information recorded and outgoing goods examinations 
• Transport concept and storage. 
2.4.2.2 Monitoring of the commissioning phase 
Commissioning follows installation and grid connection. Prior to commencing monitoring ac 
tivities, a commissioning manual shall be compiled and submitted to the appointed inspector 
for examination. The monitoring of the commissioning phase incorporates checking the fol 
lowing: 
• Conformity of the main components of the support structure with the verified design docu 
mentation and their respective traceability and numbering 
• Checking the first natural frequency of the overall installation on-site (offshore) 
• Requirements from the verification reports 
• Functional tests and tests of the safety system 
• Corrosion protection and 
• Damage. 
The appointed inspector shall be involved in the commissioning of at least two offshore wind 
turbines (for each type of construction) and the respective offshore stations. The appointed 
inspector shall determine which installations are to be reviewed. It is not necessary for the ap 
pointed inspected to be present for the whole duration of the commissioning of the installa 
tions and offshore stations. The most important parts of the commissioning phase to be in 
spected in the presence of the appointed inspector shall be agreed in advance between the 
approval holder and the appointed inspector. Where phases of the commissioning process 
have already been carried out for the first offshore wind turbine without any serious problems, 
only spot checks are needed for the second installation. 
Once the monitoring of the commissioning phase has been successfully completed, a respec 
tive verification report shall be compiled.