Above what flight level is Long Range Cruise prohibited on the CRJ-550?

Above what flight level is Long Range Cruise prohibited on the CRJ-550?

• A. Flight Level 320
• B. Flight Level 350
• C. Flight Level 300
• D. Flight Level 340

Answer: (A)

Long-range cruise is a fuel-optimization mode that relies on staying within the aircraft’s approved performance envelope. For the CRJ-550, this envelope places a ceiling on where LRC can be used—up to and including flight level 320. Above that altitude, the engine and airframe performance margins, along with certification constraints, don’t support a safe, efficient long-range profile, so LRC is not allowed. In practice, you’d use long-range cruise at or below FL320, and switch to standard cruise if you’re planning to fly higher.

Long-range cruise is a fuel-optimization mode that relies on staying within the aircraft’s approved performance envelope. For the CRJ-550, this envelope places a ceiling on where LRC can be used—up to and including flight level 320. Above that altitude, the engine and airframe performance margins, along with certification constraints, don’t support a safe, efficient long-range profile, so LRC is not allowed. In practice, you’d use long-range cruise at or below FL320, and switch to standard cruise if you’re planning to fly higher.