Which part of the APU is bled to start the engine?

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Multiple Choice

Which part of the APU is bled to start the engine?

Explanation:
Starting an engine pneumatically requires high‑pressure bleed air, which is provided by tapping air from the APU’s compressor outlet. This bleed air is fed to the engine’s air turbine starter to spin the engine up to idle. The turbine inlet is downstream of the turbine, the combustor is where fuel burns, and the fan outlet is bypass or lower‑pressure air—none of these provide the controlled high‑pressure air needed for starting. So the compressor outlet is the source used to start the engine.

Starting an engine pneumatically requires high‑pressure bleed air, which is provided by tapping air from the APU’s compressor outlet. This bleed air is fed to the engine’s air turbine starter to spin the engine up to idle. The turbine inlet is downstream of the turbine, the combustor is where fuel burns, and the fan outlet is bypass or lower‑pressure air—none of these provide the controlled high‑pressure air needed for starting. So the compressor outlet is the source used to start the engine.

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