What defines the required climb rate in order to reach a specified obstacle clearance height?

• A. The climb gradient and rate
• B. The fuel flow
• C. The cabin altitude
• D. The number of engines

Answer: (A)

To reach an obstacle clearance height, you must follow a climb path with a specific gradient—the vertical distance gained per horizontal distance. That gradient tells you how steep the climb needs to be to get over the obstacle in the available distance. The actual climb rate you need to maintain is simply this gradient applied to your current speed: climb rate equals the gradient times groundspeed. So the required rate is set by the climb gradient and how fast you are moving along the flight path. Factors such as fuel flow, cabin altitude, or the number of engines influence performance, but they don’t define the geometric requirement itself.