What is the minimum vertical speed allowed when climbing above FL180?

• A. 200 FPM
• B. 400 FPM
• C. 100 FPM
• D. 300 FPM

Answer: (A)

Above flight level 180, you need a climb rate that guarantees you make steady progress toward assigned altitudes and maintains safe airspace management. The minimum vertical speed you should not go below is 200 feet per minute because very shallow climbs in thin air can be inefficient and slow to reach the next clearance, increasing the risk of violating altitude constraints or encountering other traffic. This 200 FPM value provides a reliable baseline that the autopilot/flight director can sustain, even with minor disturbances, while still allowing faster climbs when needed. Rates faster than 200 FPM are permissible, but they aren’t the minimum; a rate of 100 FPM would be too slow, while 300 or 400 FPM are simply higher climb rates, not the minimum.