Signal square

A signal square is an aerodrome equipment internationally defined at the annex 14 of the Convention on International Civil Aviation by the International Civil Aviation Organization.[1] It contains ground symbols to indicate visually the conditions on the aerodrome to over-flying aircraft. There are four basic signals.[2]

  • A horizontal red square panel with yellow diagonals when displayed in a signal area indicates that landings are prohibited and that the prohibition is liable to be prolonged.
    A horizontal red square panel with yellow diagonals when displayed in a signal area indicates that landings are prohibited and that the prohibition is liable to be prolonged.
  • A horizontal red square panel with one yellow diagonal when displayed in a signal area indicates that owing to the bad state of the manoeuvring area, or for any other reason, special precautions must be observed in approaching to land or in landing.
    A horizontal red square panel with one yellow diagonal when displayed in a signal area indicates that owing to the bad state of the manoeuvring area, or for any other reason, special precautions must be observed in approaching to land or in landing.
  • A horizontal white dumb-bell when displayed in a signal area indicates that aircraft are required to land, take off and taxi on runways and taxiways only.
    A horizontal white dumb-bell when displayed in a signal area indicates that aircraft are required to land, take off and taxi on runways and taxiways only.
  • The horizontal white dumb-bell but with a black bar placed perpendicular to the shaft across each circular portion of the dumb-bell when displayed in a signal area indicates that aircraft are required to land and take off on runways only, but other manoeuvres need not be confined to runways and taxiways.
    The horizontal white dumb-bell but with a black bar placed perpendicular to the shaft across each circular portion of the dumb-bell when displayed in a signal area indicates that aircraft are required to land and take off on runways only, but other manoeuvres need not be confined to runways and taxiways.
  • The landing T, showing the wind direction on an all-over landing field with the tail of the T pointing downwind. On airfields with runways it indicates the landing and take-off direction.
    The landing T, showing the wind direction on an all-over landing field with the tail of the T pointing downwind. On airfields with runways it indicates the landing and take-off direction.
  • The right hand circuit indicator.
    The right hand circuit indicator.
  • Air traffic services reporting office.
    Air traffic services reporting office.
  • Closed runways or taxiways.
    Closed runways or taxiways.
  • Directions for landing or take off, runway in use.
    Directions for landing or take off, runway in use.
  • Glider flights in operation.
    Glider flights in operation.

See also

References
  1. International Civil Aviation Organization. Council. (July 2009). Aerodromes : international standards and recommended practices (PDF). Annex ... to the Convention on International Civil Aviation. Vol. I — Aerodrome Design and Operations (5th ed.). Montréal: International Civil Aviation Organization. ISBN 978-92-9231-332-6.
  2. "The Signal Square & Other Visual Signals to Aircraft".
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