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Gas Turbine Handbook : Principles and Practices

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Boroscope Inspection 225<br />

Figure 13-24. Boroscope view of first stage turbine blades <strong>and</strong> rub<br />

strip taken with a flexible fiber optic boroscope via a combustor boroscope<br />

port. 5,000 horsepower gas turbine-generator unit with 1,000<br />

hours operation.<br />

Figure 13-25. First stage turbine blade with burnt tip <strong>and</strong> “chalkysubstance”<br />

built-up on concave surface. 5,000 horsepower gas turbine-generator<br />

drive unit with 9,000 hours operation.

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