🔍 Key Concepts

• Basic start sequence of a gas turbine engine • Role of the gas generator/compressor versus the power turbine (PT) section • Which component provides the initial rotational energy before the engine can run on its own

💭 Think About

• Ask yourself: which part of the system is responsible for getting the compressor turning before there is enough combustion to be self‑sustaining? • Which listed component is designed specifically to operate only during the start sequence, not during normal continuous operation? • Which shafts in the options normally transmit power after the engine is running, rather than to get it started?

✅ Before You Answer

• Identify which component is used only during engine start and not for continuous power transmission • Distinguish between gas generator/compressor drive and power turbine/output drive functions • Confirm which shafts in the options are normally driven by the engine (after it’s running) instead of driving the engine to get it started