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Part B - Certificates and approval requirements 
At the same time, the stability of the installation against collapse, including the machine, and the func 
tion of both the safety system and the brake systems shall be tested. The items covered by periodical 
inspections are specified in Table 1. 
Assembly 
Test item 
Rotor blade 
Damage to the surface, cracks, structural inconsisten 
cies of the blade body (inspection from a lifting platform 
or climbing device: Visual assessment and inspection of 
the structure using suitable processes (e.g. knocking, 
ultrasound)). Tightening torque of screw connections. 
Damage to the lightning protection equipment. 
Driveline 
Leaks, unusual noises, condition of the corrosion pro 
tection, lubrication condition, tightening torque of screw 
connections. Condition of the gear unit (oil sample if 
necessary). 
Nacelle and components that carry force 
and torque 
Corrosion, cracks, unusual noises, lubrication condition, 
tightening torque of screw connections. 
Hydraulic system, pneumatic system 
Damage, leaks, corrosion, function. 
Support structure (tower, underwater 
structure, foundation) 
Corrosion, cracks, tightening torques of screw connec 
tions, unacceptable scouring, position. 
Safety equipment, measuring sensors 
and brake systems 
Function checks, compliance with limit values, damage, 
wear. 
System control and electrotechnical com 
ponents including transformer, station 
and switchgear 
Connections, attachment, function, corrosion, contami 
nation. 
Documents 
Completeness, compliance with regulations, imple 
mentation, test documents, regular undertaking of 
maintenance, undertaking of any modifications/repairs 
according to authorisation. 
Table 1 : 
Recurrent test items