WTT Preventive Maintenance Procedures 2

Question 1

What is the recommended interval for inspecting wind turbine blade leading edge erosion under standard operating conditions?

Accepted Answer

Annually

Answer

Annual blade inspections are the industry standard for detecting leading edge erosion before it significantly reduces aerodynamic efficiency.

Question 2

During a gearbox oil change, a technician notices the drained oil contains fine metallic particles but no chunks. What is the appropriate next step?

Accepted Answer

Refill with new oil and flag for increased monitoring interval

Answer

Fine metallic particles are a normal byproduct of gear wear; the correct response is to refill and shorten the monitoring interval to watch for progression.

Question 3

Which torque method is preferred when re-torquing main flange bolts during preventive maintenance?

Accepted Answer

Torque wrench to manufacturer-specified values

Answer

Manufacturer-specified torque values applied with a calibrated torque wrench ensure proper clamp load and prevent bolt fatigue or joint loosening.

Question 4

What does a rising trend in vibration amplitude on the main bearing during consecutive PM readings typically indicate?

Accepted Answer

Progressive bearing wear requiring attention

Answer

A consistent upward trend in vibration amplitude is a classic condition-monitoring signal of progressive bearing degradation.

Question 5

Before performing any work inside the nacelle, which safety interlock must a technician verify is engaged?

Accepted Answer

Rotor lock (rotor brake + lock pin)

Answer

The rotor must be secured with both the mechanical rotor brake engaged and the rotor lock pin inserted to prevent unexpected rotation.

(WTT) Wind Turbine Technician Certification Practice Test

(WTT) Wind Turbine Technician Certification Practice Test

WTT Preventive Maintenance Procedures 2