Question 95Gas Turbine - 1st Asst/Chief
70% to passWhich of the following is the most probable cause if, while underway, the main propulsion gas turbine air intake blow-in doors open?
AExhaust pressures are higher than normal.
BAir inlet pressures to the compressor are higher than normal.
CAir inlet temperatures to the compressor are higher than normal.
DIce has formed on the air intakes.
AI Explanation
The correct answer is D) Ice has formed on the air intakes. The blow-in doors on the main propulsion gas turbine air intake are designed to open if ice forms on the air intakes. This prevents the ice buildup from restricting airflow and causing damage to the engine. Options A, B, and C are incorrect because they do not directly cause the blow-in doors to open - high exhaust pressures, high air inlet pressures, or high air inlet temperatures would not necessarily trigger the blow-in door mechanism. Ice formation on the air intakes is the most probable cause for the blow-in doors to open while the vessel is underway.
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