raadioside katkemine teatud atmosfäärikihis, ajutine nägemishäire suurtel kiirendustel lennukis või kosmoselaevas, a fadeout, due to environmental factors, of radio and telemetry transmission between ground stations and aerospace vehicles travelling at high speeds in the atmosphere, a physical condition in which vision is temporarily obscured by a blackness, accompanied by a dullness of certain other senses; it may occur when pulling out of a high-speed dive in a plane