In the marine gas turbine engine shown in the illustration, the 9th stage bleed air is used for which of the following? Illustration GT-0017

Correct Answer: Option D — Power turbine cooling.

In the LM2500 architecture, 9th stage compressor bleed air is extracted at a lower pressure relative to the high-pressure stages. This air is routed to the power turbine section to provide necessary cooling for the turbine discs and blades, ensuring structural integrity during high-load marine propulsion operations.