Plain English Meaning

It is a gauge reading that tells the pilot how hard the engine is working. A higher reading means more power; a lower reading means less power.

Full Definition

The absolute pressure of the fuel/air mixture inside the engine's intake manifold, measured in inches of mercury (in. Hg). In a piston aircraft engine, manifold pressure indicates how much air is being delivered to the cylinders and is the primary indication of engine power output in airplanes equipped with a constant-speed propeller.

Context Anchor

Seen when setting climb power, cruise power, or other in airplanes equipped with a , especially those with .