Which system supplies the air for starting the gas turbine?

Which system supplies the air for starting the gas turbine?

• A. Bleed air system
• B. Coolant system
• C. Fuel system
• D. Hydraulic system

Answer: (A)

Starting a gas turbine requires a burst of high‑pressure air to drive the compressor through a pneumatic starter until the engine can sustain itself on fuel. That air is supplied by the bleed air system, which provides conditioned air from the engine’s own compressor stages (or an auxiliary source such as an APU) to the starting device. The air must be clean and at the right pressure to spin up the compressor without damaging components. The other systems don’t provide starting air: the coolant system moves heat away from engine parts, the fuel system delivers fuel for combustion, and the hydraulic system powers actuators—none of which are used to start the turbine.

Starting a gas turbine requires a burst of high‑pressure air to drive the compressor through a pneumatic starter until the engine can sustain itself on fuel. That air is supplied by the bleed air system, which provides conditioned air from the engine’s own compressor stages (or an auxiliary source such as an APU) to the starting device. The air must be clean and at the right pressure to spin up the compressor without damaging components. The other systems don’t provide starting air: the coolant system moves heat away from engine parts, the fuel system delivers fuel for combustion, and the hydraulic system powers actuators—none of which are used to start the turbine.