FAA Sport Pilot Airplane (SPA)Aircraft Performance and SystemsHard
A pilot is analyzing the climb performance of an airplane at increasing altitudes. At the altitude where the airplane's maximum rate of climb has decreased to zero feet per minute — meaning the airplane can no longer climb regardless of airspeed or power setting — this altitude is called the
- Acritical altitude
- Bpressure altitude
- Cabsolute ceiling
- Dservice ceiling
Show answer & explanationAnswer & explanation
Correct answer: C. absolute ceiling
The absolute ceiling is the altitude at which the maximum rate of climb equals zero, meaning the airplane is theoretically unable to climb any higher under any conditions. This differs from the service ceiling, which is the altitude where maximum rate of climb has decreased to 100 feet per minute, a more practical operational limit.
Why the other options are wrong
- A. Critical altitude relates to turbocharged/supercharged engines maintaining rated power, unrelated to climb rate.
- B. Pressure altitude is a reference altitude based on standard pressure, unrelated to climb performance limits.
- D. Service ceiling is defined at 100 fpm rate of climb, not zero.
Absolute Ceiling
The altitude at which an airplane's maximum rate of climb reaches zero feet per minute, representing the theoretical maximum altitude attainable.
- Rate of climb = 0 fpm at absolute ceiling
- Service ceiling occurs at 100 fpm, below absolute ceiling
- Both decrease with increased weight, temperature, and density altitude
- Found using climb performance charts or graphs
Memory trick: Absolute ceiling = absolutely no more climb (0 fpm)