noise zone

permanent noise zone

grid zone / grid-zone

zone standard time (zone time) (ZST)

killing zone / kill zone

grid zone designation / Grid Zone Designator

grey-zone / grey zone (international relations)

hundred-per-cent zone (one-hundred-per-cent zone)

no-fire zone / no fire zone

flight restriction zone / flight restricted zone (FRZ)

background noise

impulse noise

mock battle noise

signal-to-noise ratio (SNR; S/N)

noise suppression device

noise suppression system

acoustic noise

aircraft noise production program

balanced program of noise control

calculated noise level

current certified noise level

jet noise prediction technique

landing noise

turbulence-induced noise

atmospheric noise

attenuate noise

augmented lift system noise

environment control system noise

equivalent noise resistance

reduce noise

reference noise measurement point

reverse thrust noise

working group on aircraft noise