Turbine Overhaul (OH) Test 1 Practice

The main aim of compressor field cleaning is to restore smooth, efficient airflow through the compressor by removing deposits on blades and vanes. When deposits from oil, fuel, and ingestibles build up, they roughen the surface and disturb the airflow, causing a drop in compressor efficiency and pressure ratio. This leads to slower throttle response, or unsatisfactory accelerations, and the engine has to work harder, which raises the exhaust gas temperature. Over time, the rough surface and deposits can contribute to corrosion and increase the risk of compressor-related faults or failures.

Cleaning restores the smooth surfaces, improves flow, and helps maintain performance, quicker acceleration, and lower EGT, while reducing the likelihood of corrosion.

Deposits that roughen surfaces would worsen performance, not improve it. A dirty compressor tends to restrict airflow, not improve it. And cleaning aims to improve efficiency, not increase fuel consumption.