Definition
A strong electromagnetic field produced by powerful ground-based or airborne transmitters, such as radar installations, broadcast towers, and military emitters, that can induce unwanted electrical currents in an aircraft's wiring and electronic systems. Aircraft must be designed and tested to ensure their avionics, flight controls, and other electrical systems continue to function correctly when exposed to these fields.
Plain English
An area of strong invisible radio energy, usually near things like radar dishes or big transmitters, that can interfere with an aircraft's electronics if the aircraft isn't built to handle it.
Context Anchor
Seen in aircraft certification, avionics protection, and operating near powerful transmitters such as radar sites or high-power communication antennas.
Derivation
From 'high-intensity' (strong in level) and 'radiated field' (an electromagnetic field spreading outward from a transmitter). The phrase describes exactly what it is: a strong field of radiated energy.
Why Pilots Care
These fields can cause navigation, communication, or flight control systems to malfunction if the aircraft lacks adequate shielding.
Analogy
It is similar to a very loud noise overpowering a conversation. The aircraft electronics are not hearing sound, but a strong outside energy source can still overwhelm or disturb sensitive equipment.
Grounding Statement
Picture an aircraft passing near a powerful radar antenna and being exposed to strong invisible electrical energy in the air around it.
Intuition Check
“Field” does not mean a grass field or airport area here. It means a region of invisible electrical and magnetic energy around a transmitting source.
Example Sentence 1
The avionics suite was certified to operate normally within a high-intensity radiated field environment, including exposure to military radar emissions.
Example Sentence 2
Maintenance crews checked the shielding after the plane flew close to a high-intensity radiated field from a broadcast tower.