Question 93Gas Turbine - 1st Asst/Chief

The correct answer is A) 14th stage compressor blades. The borescope ports located in the compressor rear frame casing of the marine propulsion gas turbine can be used to inspect the fuel nozzles, combustor, and 1st stage turbine nozzle, but not the 14th stage compressor blades. The compressor blades are located further forward in the engine, beyond the reach of these specific borescope ports. The other components listed (fuel nozzles, combustor, and 1st stage turbine nozzle) are all located in the rear section of the engine, making them accessible through the borescope ports in the compressor rear frame casing.