124. In the marine gas turbine engine shown in the illustration, the HP turbine 2nd stage nozzle vanes are cooled by which of the following

The HP turbine 2nd stage nozzle vanes are cooled by 13th stage compressor air, as indicated by the labeled airflow in the illustration. Other bleed air sources are designated for different functions, such as frame venting, lower-stage cooling, customer bleed, or high-pressure recoup, and do not supply air to the 2nd stage nozzle vanes.