Plain English Meaning

The part driven by the engine that makes electricity for the aircraft and keeps the battery charged while flying. Alternators and generators do the same job in slightly different ways, with alternators being the more common modern choice.

Full Definition

An engine-driven electrical component that converts mechanical energy from the engine into electrical energy to power the aircraft's electrical system and recharge the battery during flight. An alternator produces alternating current that is then rectified to direct current, while a generator produces direct current directly. Most modern light aircraft use alternators because they produce useful output at lower engine speeds and weigh less than equivalent generators.

Context Anchor

Seen during discussions of the electrical system, checks, , and .