Which statement is true about N1 and N2 ranges?

Which statement is true about N1 and N2 ranges?

• A. N1 minimum is 60%
• B. N1 continuous operation begins at 60% and ends at 100.1%
• C. N2 takeoff/max is 103% max
• D. N1 transient is 103.8% (30 sec)

Answer: (B)

The main idea is how N1 limits are divided into bands for safe operation: continuous, transient, and takeoff. For N1, the continuous operation range is designed for normal flight and is defined from about 60% up to just above 100% (100.1%). This means you can run N1 in that window without special restrictions, and only brief excursions beyond 100% are allowed if they stay within transient limits. That’s why the statement about N1 continuous operation beginning at 60% and ending at 100.1% is the true one. The other options mix up the limits or state values that aren’t universally fixed across engines, so they aren’t the correct description of the standard ranges.

The main idea is how N1 limits are divided into bands for safe operation: continuous, transient, and takeoff. For N1, the continuous operation range is designed for normal flight and is defined from about 60% up to just above 100% (100.1%). This means you can run N1 in that window without special restrictions, and only brief excursions beyond 100% are allowed if they stay within transient limits.

That’s why the statement about N1 continuous operation beginning at 60% and ending at 100.1% is the true one. The other options mix up the limits or state values that aren’t universally fixed across engines, so they aren’t the correct description of the standard ranges.