Question 105Gas Turbine - 1st Asst/Chief

The correct answer is A) The air oil separator is not functioning properly. The air oil separator is responsible for removing air bubbles from the engine's lubricating oil. If the air separator is not working correctly, it will allow excess air to remain in the oil, causing it to become excessively aerated. This aeration can lead to issues with oil pressure and flow, potentially causing damage to the engine. The other options are not the most probable causes for excessive aeration of the sump oil. Higher air inlet temperatures (B), lower compressor discharge pressure (C), and lower exhaust pressures (D) would not directly result in aerated oil - the issue is more likely with the air separation function within the lubrication system.