N2 green range is defined as which of the following?

N2 green range is defined as which of the following?

• A. 0-99.3%
• B. 0-100%
• C. 0-95%
• D. 0-90%

Answer: (A)

The N2 green range shows the normal, safe operating band for the high‑pressure compressor spool. It runs from idle up to just below the engine’s maximum speed. The upper end is 99.3% because 100% would reach the redline, leaving a small margin to prevent overspeed and potential damage. So the green range is 0 to 99.3%. The other options would either imply you can safely hold at 100% or shorten the upper limit, which isn’t how the gauge’s green band is defined. In practice, stay within the green arc for normal operation, and beware of yellow or red if you approach the upper limit.

The N2 green range shows the normal, safe operating band for the high‑pressure compressor spool. It runs from idle up to just below the engine’s maximum speed. The upper end is 99.3% because 100% would reach the redline, leaving a small margin to prevent overspeed and potential damage. So the green range is 0 to 99.3%. The other options would either imply you can safely hold at 100% or shorten the upper limit, which isn’t how the gauge’s green band is defined. In practice, stay within the green arc for normal operation, and beware of yellow or red if you approach the upper limit.