What are the five N2 idle settings?

What are the five N2 idle settings?

• A. Flight, Landing, Approach, Ground, Reverse
• B. Idle, Run, Takeoff, Descent
• C. First, Last, After, Return
• D. Fly, Land, Approach, Ground, Stop

Answer: (A)

N2 idle settings are tied to how the engine is operating in different phases of flight and ground operation, not to arbitrary labels. The five idle conditions are used to keep the engine stable and controllable as the aircraft moves through its typical phases, including when thrust is being reversed for deceleration. Flight idle is the idle state used in the air during level flight, approach idle supports stable control as you descend and prepare for landing, landing idle governs idle throttle during the approach-to-landing sequence and touchdown, ground idle is used when the aircraft is on the ground for taxi and systems operation, and reverse idle refers to the idle condition when thrust reversers are deployed to help slow the aircraft after touchdown. The other options mix terms that aren’t standard idle states, so they don’t reflect how N2 idle is managed across the flight and ground phases.

N2 idle settings are tied to how the engine is operating in different phases of flight and ground operation, not to arbitrary labels. The five idle conditions are used to keep the engine stable and controllable as the aircraft moves through its typical phases, including when thrust is being reversed for deceleration. Flight idle is the idle state used in the air during level flight, approach idle supports stable control as you descend and prepare for landing, landing idle governs idle throttle during the approach-to-landing sequence and touchdown, ground idle is used when the aircraft is on the ground for taxi and systems operation, and reverse idle refers to the idle condition when thrust reversers are deployed to help slow the aircraft after touchdown. The other options mix terms that aren’t standard idle states, so they don’t reflect how N2 idle is managed across the flight and ground phases.