N1 green range is defined as which of the following?

N1 green range is defined as which of the following?

• A. 0-99.4%
• B. 0-100%
• C. 0-95%
• D. 0-98%

Answer: (A)

N1 green range represents the normal operating envelope for the engine’s N1 spool speed. It sets the speed range where operation is considered within safe, standard limits. For this aircraft, the green arc goes from idle up to 99.4% N1, not all the way to 100%. That slight shortfall provides a safety margin below the actual limit, helping to avoid hitting the redline or warnings due to measurement tolerances and transient spikes. So the defined normal range is 0 to 99.4% N1. The other options would imply pushing to 100% or using a narrower band, which isn’t how the green range is specified.

N1 green range represents the normal operating envelope for the engine’s N1 spool speed. It sets the speed range where operation is considered within safe, standard limits. For this aircraft, the green arc goes from idle up to 99.4% N1, not all the way to 100%. That slight shortfall provides a safety margin below the actual limit, helping to avoid hitting the redline or warnings due to measurement tolerances and transient spikes. So the defined normal range is 0 to 99.4% N1. The other options would imply pushing to 100% or using a narrower band, which isn’t how the green range is specified.