TOGA N2 limit is what percentage?

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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

TOGA N2 limit is what percentage?

Explanation:
The value tests the maximum high‑pressure spool speed allowed when the thrust levers are in TOGA. This limit on N2 is set to protect the engine from overspeed during the aggressive acceleration TOGA commands, while still delivering full thrust. For the CRJ-550 with these engines, that limit is 99.4% N2. The FADEC will push toward full TOGA thrust but stay below this fixed ceiling, providing a safe margin before the actual redline at 100% N2. Choosing a higher figure like 99.5% would leave less margin to absorb transients and measurement tolerances, risking occasional overspeed; opting for 98% or 97% would unnecessarily restrict TOGA performance.

The value tests the maximum high‑pressure spool speed allowed when the thrust levers are in TOGA. This limit on N2 is set to protect the engine from overspeed during the aggressive acceleration TOGA commands, while still delivering full thrust. For the CRJ-550 with these engines, that limit is 99.4% N2. The FADEC will push toward full TOGA thrust but stay below this fixed ceiling, providing a safe margin before the actual redline at 100% N2.

Choosing a higher figure like 99.5% would leave less margin to absorb transients and measurement tolerances, risking occasional overspeed; opting for 98% or 97% would unnecessarily restrict TOGA performance.

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