Definition
Unwanted electrical noise heard in a radio receiver, caused by atmospheric electrical activity such as lightning, precipitation striking the airframe, or charged particles building up on the aircraft. It appears in the audio as crackling, hissing, or popping sounds that obscure voice transmissions and navigation signals.
Plain English
Crackling or hissing in the radio caused by electrical activity in the air around the aircraft, which can drown out what you are trying to hear.
Context Anchor
Pilots may notice static interference during radio communication, when using radio navigation equipment, or when flying near storms, heavy rain, snow, dust, or other conditions that build electrical charge.
Derivation
From Latin staticus, meaning 'standing' or 'at rest,' referring originally to electricity that builds up on a stationary surface rather than flowing through a wire. In radio use it came to describe the noise produced when that built-up electrical energy discharges and disrupts the signal.
Why Pilots Care
It can make ATC communications unintelligible and mask important navigation signals, requiring pilots to use alternative frequencies or wait for conditions to change.
Analogy
It is like trying to listen to a station on a car radio while loud crackling covers the words. The message may still be there, but the noise makes it harder to pick out.
Intuition Check
Static does not mean “not moving” here, and it does not refer to the aircraft static port. In this term, static means electrical charge that creates unwanted radio noise.
Example Sentence 1
As they flew closer to the line of thunderstorms, static interference made the controller's instructions almost impossible to understand.
Example Sentence 2
The pilot switched to a higher frequency to reduce the effects of static interference during the thunderstorm.