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Gas Turbine Handbook : Principles and Practices

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Boroscope Inspection 221<br />

Figure 13-17. Boroscope view of first stage turbine nozzle leading<br />

edge, platform, <strong>and</strong> concave surface. 5,000 horsepower gas turbinegenerator<br />

unit shortly after installation.<br />

CAUTION<br />

Extreme care should be taken to<br />

insure that the boroscope tip does<br />

not extend into the path of the moving<br />

blades. Any contact between the<br />

boroscope, the blade, <strong>and</strong> the nozzle<br />

airfoil will result in severe damage to<br />

the boroscope <strong>and</strong> possibly the blade<br />

<strong>and</strong> nozzle. For this level of inspection<br />

the boroscope should be equipped with<br />

a locking feature that will prevent it<br />

from moving.

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