Question 103Gas Turbine - 1st Asst/Chief

70% to pass

In order to get a ready indication for a normal start with a GE LM2500 marine gas turbine, what permissive(s) must be met?

AFuel supply pressure must be greater than 8 psig

BBleed air valve must be closed.

CGas generator speed must be less than 1200 RPM and all engine trips reset.

DAll of the above.

AI Explanation

The correct answer is D) All of the above. For a normal start with a GE LM2500 marine gas turbine, the following permissives must be met: 1. Fuel supply pressure must be greater than 8 psig to ensure adequate fuel flow to the engine. 2. The bleed air valve must be closed to maintain the correct air/fuel ratio during the start sequence. 3. The gas generator speed must be less than 1200 RPM, and all engine trips must be reset to allow the turbine to safely accelerate to the desired operating speed. The other options (A, B, and C) are not sufficient on their own to meet all the required permissives for a normal start. All three conditions must be satisfied for the engine to start and operate safely.