For the GE LM2500 gas turbine engine shown in the illustration, the HP turbine 1st stage nozzle vanes are cooled by which of the following? Illustration GT-0020

Correct Answer: Option D — 16th stage compressor air.

The GE LM2500 utilizes 16th-stage compressor air for cooling the high-pressure turbine nozzle vanes. This air is at the highest pressure and temperature available from the compressor, providing the necessary cooling flow to maintain material integrity against the extreme heat of the combustion gases in the turbine section.