Definition
A sharp, high-frequency whining or screeching noise heard through the aircraft's communication or navigation receivers, typically caused by precipitation static (P-static) — the buildup and discharge of static electricity on the airframe as the aircraft flies through precipitation, dust, or ice crystals.
Plain English
A loud, high whining sound coming through the headset or speakers, usually caused by static electricity building up on the aircraft and interfering with the radios.
Context Anchor
Seen in discussions of precipitation static, especially when flying near rain, snow, ice crystals, or dust that can create radio noise.
Why Pilots Care
It indicates precipitation static that can degrade or interrupt communications and navigation signals, requiring corrective action such as activating static dischargers.
Grounding Statement
Picture flying in rough weather and suddenly hearing a sharp squeal over the headset that covers up the controller’s voice.
Intuition Check
Do not assume the squeal always means the radio itself is broken. In this context, it may be interference from static electricity building up on the aircraft.
Example Sentence 1
Shortly after entering the snow shower, the crew heard a high-pitched audio squealing in their headsets and lost the ADF needle.
Example Sentence 2
High-pitched audio squealing in the headset prompted the crew to verify the static dischargers were functional.