Which option lists only the engine idle states that are actually used on the CRJ-550?

Which option lists only the engine idle states that are actually used on the CRJ-550?

• A. Flight, Approach, Landing, Reverse, Ground
• B. Flight, Approach, Landing, Idle, Ground
• C. Flight, Landing, Reverse, Ground, Cruise
• D. Flight, Approach, Ground, Reverse, Takeoff

Answer: (A)

Engine idle states on the CRJ-550 are the predefined low-power engine configurations used during different phases of flight and ground operations. These states are chosen to keep the engines stable and ready for transitions while optimizing fuel use and control during each phase. The states actually used are for when the aircraft is airborne (flight idle), during approach (approach idle), during the landing rollout (landing idle), whentaxiing on the ground (ground idle), and when thrust reversers are employed after touchdown (reverse). So the set that lists Flight idle, Approach idle, Landing idle, Reverse, and Ground matches the real idle-state usage. Options that include states associated with takeoff or cruise, or omit one of these idle states, don’t reflect how the CRJ-550 manages engine power in normal operations.

Engine idle states on the CRJ-550 are the predefined low-power engine configurations used during different phases of flight and ground operations. These states are chosen to keep the engines stable and ready for transitions while optimizing fuel use and control during each phase. The states actually used are for when the aircraft is airborne (flight idle), during approach (approach idle), during the landing rollout (landing idle), whentaxiing on the ground (ground idle), and when thrust reversers are employed after touchdown (reverse). So the set that lists Flight idle, Approach idle, Landing idle, Reverse, and Ground matches the real idle-state usage. Options that include states associated with takeoff or cruise, or omit one of these idle states, don’t reflect how the CRJ-550 manages engine power in normal operations.