Question 7Gas Turbine - 1st Asst/Chief70% to pass
The effectiveness of an off-line wash wash of a LM2500 gas turbine engine can be enhanced by doing which of the following?
AI Explanation
The correct answer is A) Stroking the Variable Stator Vanes to the maximum open position.
Stroking the Variable Stator Vanes (VSVs) to the maximum open position enhances the effectiveness of an off-line wash of a LM2500 gas turbine engine by allowing more of the wash solution to reach the compressor section. The open VSV position increases the flow path through the engine, enabling the wash solution to better penetrate and clean the compressor blades and stator vanes.
The other answer choices are incorrect because: B) Washing the power turbine while still hot would be ineffective as the power turbine is downstream of the compressor section which is the focus of the off-line wash. C) Motoring the engine just short of idle speed would not significantly improve the wash effectiveness compared to stroking the VSVs. D) Applying the power turbine brake would not affect the off-line wash of the compressor section.
Related Questions
#5 On a gas turbine propulsion vessel, you notice a slow but steady increase in gas turbine vibration and specific fuel consumption as the voyage has progressed. What would be a good maintenance technique to use to correct these increases? #6 On a gas turbine powered vessel, what is the last step after an off-line water wash? #8 When conducting a borescope inspection of the compressor, why can airfoil and tip cracks be difficult to detect? #9 Zero reference for the GE LM2500 gas turbine engine is established by the use of which of the following engine components? #10 On an GE LM2500 gas turbine powered vessel you are conducting a borescope inspection of the compressor. What is used on each compressor stage as a reference for indexing the blades?