Which rotor powers the accessories in this engine design?

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Multiple Choice

Which rotor powers the accessories in this engine design?

Explanation:
The accessories are driven by the high-pressure rotor. In a typical two-spool engine, the accessory gearbox is powered from the high-pressure spool (N2) because its speed is relatively stable across different operating conditions and provides enough drive to run pumps, starters, and generators. The low-pressure rotor (N1) varies widely with throttle and fan load, which would make accessory operation inconsistent. Therefore, using the high-pressure spool ensures reliable accessory power throughout start, idle, and full thrust.

The accessories are driven by the high-pressure rotor. In a typical two-spool engine, the accessory gearbox is powered from the high-pressure spool (N2) because its speed is relatively stable across different operating conditions and provides enough drive to run pumps, starters, and generators. The low-pressure rotor (N1) varies widely with throttle and fan load, which would make accessory operation inconsistent. Therefore, using the high-pressure spool ensures reliable accessory power throughout start, idle, and full thrust.

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