What does the "N2" measurement indicate in the CRJ?

The "N2" measurement in the CRJ indicates the speed of the engine's high-pressure compressor. In turbofan engines, including those used in the CRJ, there are typically two shafts that rotate at different speeds: N1 and N2. N1 is the speed of the low-pressure turbine and its associated fan, while N2 represents the speed of the high-pressure compressor and the high-pressure turbine.

Understanding N2 is crucial for pilots, as it provides important information about engine performance and efficiency. Monitoring N2 helps ensure that the engine operates within safe limits and contributes to the overall thrust produced by the aircraft. This measurement is used in conjunction with other engine parameters to make informed decisions regarding power settings, fuel flow, and operational status.