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Gas Turbine Handbook : Principles and Practices

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Boroscope Inspection 223<br />

Figure 13-20. Foreign object damage to a second stage turbine nozzle<br />

trailing edge. 4,500 horsepower gas turbine-cogeneration unit after<br />

16,820 hours operation.<br />

Figure 13-21. Trailing edge crack in the first stage turbine nozzle<br />

trailing edge. 5,000 horsepower gas turbine-compressor drive unit<br />

with less than 7,000 hours operation.

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