Which term is the altitude at which a climb is no longer possible?

• A. Absolute Ceiling
• B. Service Ceiling
• C. Cruise Altitude
• D. Maximum Altitude

Answer: (A)

Climb performance drops as you go higher because the air gets thinner, giving less lift and reducing engine and propeller efficiency. There comes a point where the airplane cannot achieve any positive rate of climb—the thrust available isn’t enough to overcome weight and drag for a climb. That is the absolute ceiling: the highest altitude at which climbing is no longer possible.

This is different from the service ceiling, where you can still climb but very slowly (a small rate of climb). Cruise altitude is where you level off for efficient flight, and maximum altitude is the absolute physical limit the aircraft can reach under ideal conditions. So the term for the altitude where you can’t climb anymore is the absolute ceiling.