Definition
A condition in which the engine-driven generator stops producing electrical power, leaving the aircraft's electrical system dependent on the battery alone. Once the generator fails, the battery is no longer being recharged in flight and will deplete over time, progressively losing power to radios, instruments, lights, and other electrical equipment.
Plain English
The part of the engine that makes electricity has stopped working. The aircraft is now running on battery power only, and that battery will eventually run down.
Context Anchor
Seen in instrument flying discussions, emergency checklists, and cockpit warning indications for electrical system problems.
Derivation
Generator comes from the Latin idea of “bringing forth” or “producing.” In aviation, it means a device that produces electrical power for the aircraft while the engine is running.
Why Pilots Care
Without prompt load management the battery will discharge, causing loss of navigation, communication, and flight instruments in instrument conditions.
Intuition Check
A generator failure does not mean the engine has failed. It means the aircraft’s normal electrical power source has stopped supplying electricity.
Example Sentence 1
After noticing the ammeter showing a steady discharge, the pilot identified a generator failure and began shedding non-essential electrical loads to preserve the battery.
Example Sentence 2
During the IFR approach the pilot monitored battery voltage closely following the generator failure to ensure the attitude indicator remained powered.