Definition
The process of automatically maintaining the output voltage of an aircraft generator or alternator at a constant value, regardless of changes in engine speed or electrical load. A voltage regulator senses the output voltage and adjusts the field current to keep it within design limits.
Plain English
Keeping the electrical system's voltage steady, even as the engine speed changes or as more equipment is switched on or off.
Context Anchor
Seen in aircraft electrical system discussions, especially when checking the alternator, generator, voltage regulator, battery charging, or electrical system warnings.
Derivation
From the Latin 'regula', meaning a rule or straight rod used as a standard. To regulate is to hold something to a fixed standard. Here, voltage is held to a set value rather than allowed to drift up and down.
Why Pilots Care
Prevents damage to avionics and instruments while ensuring reliable power delivery throughout the flight.
Analogy
It is like a household thermostat: the thermostat does not make the room perfect forever, but it keeps correcting the system so the temperature stays near the desired setting. Voltage regulation does the same kind of steady correction for electrical voltage.
Intuition Check
Regulation here does not mean an FAA rule. It means active control that keeps electrical voltage from going too high or too low.
Example Sentence 1
Poor voltage regulation caused the bus voltage to climb above 28 volts, triggering the over-voltage warning light.
Example Sentence 2
A pilot checks the ammeter to confirm voltage regulation is working during cruise.