Which statement best describes an altitude engine?

• A. A turbocharged engine that maintains power at altitude.
• B. A reciprocating engine having a rated takeoff power that is producible from sea level to an established higher altitude.
• C. An engine designed to operate only at sea level.
• D. An engine with altitude compensation.

Answer: (B)

An altitude engine is defined by its ability to deliver its rated takeoff power from sea level up to a higher, specified altitude. As air gets thinner with altitude, engine power tends to drop, but these engines are designed so that the takeoff power remains usable over that range, often through turbocharging or other altitude-compensation methods. The key point is the maintained takeoff power across a stated altitude range, not a specific mechanism or operation only at sea level. The other statements either describe a particular technology (like turbocharging) or refer to restrictions that don’t define the concept.