Underfloor fire

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White underfloor light for runways

Inset light (Engl. Surface Lights) are almost floor-level fires on runways , taxiways and apron areas of airports .

They are mainly used where regular overrun by aircraft is to be expected. This is primarily the case on the center line of the runways and on the center line of taxiways and aprons. Since underfloor lights also have advantages for operation (for example when clearing snow), they are increasingly being used in other places.

Underground lights have to be able to withstand large loads, such as B. rolling over by an aircraft, and are therefore correspondingly more expensive than above-ground lights . They must be constructed in such a way that they cannot cause damage to aircraft wheels. The temperature between the tire of an aircraft and the fire must not exceed 160 ° C for ten minutes in order not to damage the aircraft tire.

Underground lights are usually fed by cables that are fed to the fire via cable ducts laid underground . They must always be installed horizontally. According to international guidelines Attachment (Engl. Annex ) to the Chicago Convention must not protrude than 13 millimeters from the paved surface more.

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