FAA Aviation Mechanic Powerplant (AMP)Turbine EnginesEasy
A technician performs a compressor water wash on a turbine engine that has been operating in a coastal, dusty environment. What is the primary purpose of this maintenance procedure?
- ACheck the spray pattern of the fuel nozzles
- BRemove salt and dirt deposits from compressor blades to restore compressor efficiency
- CLubricate the compressor bearings
- DCool the turbine section after high-power operation
Show answer & explanationAnswer & explanation
Correct answer: B. Remove salt and dirt deposits from compressor blades to restore compressor efficiency
Compressor water washing removes accumulated salt, dirt, and other contaminants from the compressor airfoils that build up during operation in coastal or dusty environments, restoring compressor efficiency, reducing EGT, and improving fuel economy.
Why the other options are wrong
- A. Fuel nozzle spray pattern is checked separately, not by a compressor wash.
- C. Compressor bearings are lubricated by the oil system, not water wash.
- D. Water washing is done to clean, not to cool the turbine section.
Compressor Water Wash
A maintenance procedure using water (sometimes with a cleaning solution) to remove salt, dirt, and contaminant buildup from compressor airfoils to restore efficiency.
- Restores compressor efficiency and reduces EGT
- Common in coastal/dusty operating environments
- Performed with engine motoring, not running, in most procedures
Memory trick: Water wash = giving the compressor a bath to wash off salt and grime buildup.