You are conducting a borescope inspection of...

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Question 1 of 205eccef9fbacbc34ba4d46bdd

You are conducting a borescope inspection of the compressor section of a GE LM2500 gas turbine. In stage four, you see a slight tilt to one blade and the blade platform is raised higher than the other blades. What could be a cause of this condition and what would be your course of action?

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🔍 Key Concepts

• Compressor blade root and platform design and how they fail • Difference between safe-to-operate vs must-remove-from-service findings on a borescope • How FOD (foreign object damage), fatigue, or ice typically appear on blades (nicks, bends, cracks vs root/platform movement)

💭 Think About

• If a blade is tilted and its platform is higher than its neighbors, what does that suggest about what’s happening at the root where the blade locks into the disk? • Which of the options would represent a potentially serious structural problem vs cosmetic surface damage? • In a high‑speed gas turbine compressor, what are the risks of continuing to operate with a possibly loose or shifted blade?

✅ Before You Answer

• Identify which choice links the observed geometry change (tilt + raised platform) to a root or attachment problem, not just surface damage. • Check which option calls for the most conservative safety action when there is any doubt about blade attachment integrity. • Eliminate any answer that suggests continuing normal or near‑normal operation with a blade that may not be fully secure in the rotor.

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