Landing threshold

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Landing threshold at the beginning of the runway without separate marking (white crossbar).
Relocated landing threshold in Dubai, the marking (white crossbar) can hardly be seen here.

A landing threshold or threshold , ( English threshold , THR ) is the point on a runway at which the route available for a landing begins. The landing threshold is usually at the start of the runway. Your position can be separately marked in white as a continuous crossbar on the runway. In cases where the landing threshold from the beginning of the start was further added runway backwards / ( English displaced threshold ), is one such marking required.

The conspicuous “Threshold Marking” (a zebra crossing-like marking), which is also required for certain runways, can be used as an additional marking for the landing threshold. This marking is then six meters behind the landing threshold. In the dark , the landing threshold is specially illuminated (fired).

The landing threshold is not identical to the touchdown point .

Offset threshold

Offset landing threshold with corresponding crossbar marking.

As a rule, the landing threshold is at the beginning of the concrete area of ​​the runway. But there are also runway with a displaced threshold ( English displaced threshold ). A landing aircraft produced in landing a very high pressure on the runway, which must be for well designed. For obstacle reasons (approach area is penetrated by aviation obstacles ) the threshold is moved inward. The threshold can also be temporarily offset due to construction work. Staggered thresholds can be recognized particularly well by the outdoor fire chain (green lighting), if one is available.

The pilots of the aircraft can also use the section of the runway in front of the landing threshold for take-off, unless otherwise regulated locally. A landing threshold is only relevant for landing, not for take-off. Only the part of the runway behind the landing threshold may be used for landing.

See also

literature

  • Ashford, Norman; HP Martin Stanton; Clifton A. Moore - Airport Operations , McGraw-Hill (1997). ISBN 0-070-03077-4
  • Bachmann, P. - International Airports in Europe: Plans - Data - Facts , Stuttgart: Motorbuch (1997). ISBN 3-613-01649-4
  • Fecker, Andreas: Airports , GeraMond Verlag, Munich. ISBN 3765472379
  • Kühr, Wolfgang: The private aircraft pilot , aviation law, air traffic and air traffic control regulations, Volume 5 (1983). ISBN 3-921-270-13-8