🔍 Key Concepts

• Trace the labeled 8th Stage Bleed line on the GT-0017 diagram and read exactly what its destination box says. • Distinguish between sump pressurization/cooling air and cooling air used for turbine nozzles/blades or balance pistons. • Notice that there is also an 8th Stage Customer Bleed shown; do not confuse that with the specific 8th stage bleed called out in the question.

💭 Think About

• Follow the arrow coming off the compressor at the 8th stage and ask yourself: which component or function box does this air first go to? • Compare where the 8th stage bleed goes with where cooling air for the power turbine and high‑pressure turbine nozzles comes from in the same illustration. • Ask: which of the answer choices matches the exact wording in the box connected to the 8th stage bleed line on the left side of the drawing?

✅ Before You Answer

• Verify the label on the box at the end of the 8th Stage Bleed arrow (not the customer bleed) and match its wording to one of the options. • Confirm that any cooling/pressurizing air for the power turbine or its balance piston in the figure originates from a different compressor stage (e.g., 9th, 13th, or 16th). • Make sure you are not mixing up lube oil system components (sumps, air‑oil separator) with the turbine cooling passages shown on the right side of the engine.