Routine water washing of the marine gas turbine engine compressor shown in the illustration, is usually performed while operating _______. Illustration GT-0017

Correct Answer: Option A — with the starter motor drive

Compressor water washing is performed while the engine is being cranked by the starter motor, rather than under power. This ensures that the cleaning solution effectively removes salt and contaminants from the blades without the risk of thermal shock or combustion instability that would occur during engine operation.