Question 154Gas Turbine - Assistant Engineer

The correct answer is D) With the starter motor drive. The routine water washing of the gas turbine engine compressor is typically performed with the starter motor drive, not at specific power settings. This is done to ensure the compressor blades are thoroughly cleaned while the engine is not under load, which helps maintain the engine's efficiency and performance. The other options, A) 25% power, B) 75% power, and C) full power, are incorrect because the compressor water washing is not usually conducted at those specific power settings. The key is to perform the water washing with the starter motor drive to properly clean the compressor blades without putting the engine under load.