What drives the accessory gear box?

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Prepare for the GoJet Airlines CRJ-550 Test. Use flashcards, multiple choice questions, and detailed explanations to ace your exam!

Multiple Choice

What drives the accessory gear box?

Explanation:
The accessory gear box is driven by the high-pressure compressor spool (N2). This spool is powered by the high-pressure turbine, so it provides a stable, reliable drive for the gearbox across the engine’s operating range. Inside the accessory gear box live the pumps and systems the engine needs—fuel pumps, oil pump, hydraulic pump, start motor, and similar accessories—so they can operate regardless of fan speed. The N1 fan is the low-pressure path and isn’t used to drive the AGB, and the FADEC is an electronic controller that uses electrical power rather than providing the mechanical drive. The engine oil pump is one of the items powered by the AGB, not what drives it.

The accessory gear box is driven by the high-pressure compressor spool (N2). This spool is powered by the high-pressure turbine, so it provides a stable, reliable drive for the gearbox across the engine’s operating range. Inside the accessory gear box live the pumps and systems the engine needs—fuel pumps, oil pump, hydraulic pump, start motor, and similar accessories—so they can operate regardless of fan speed. The N1 fan is the low-pressure path and isn’t used to drive the AGB, and the FADEC is an electronic controller that uses electrical power rather than providing the mechanical drive. The engine oil pump is one of the items powered by the AGB, not what drives it.

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