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- 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.It contains ground symbols to indicate visually the conditions on the aerodrome to over-flying aircraft. There are four basic signals.
* 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 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 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.
* Air traffic services reporting office.
* Closed runways or taxiways.
* Directions for landing or take off, runway in use.
* Glider flights in operation. (en)
- Il quadrato segnali, in inglese signal area o signal square, è un'area all'interno di un aerodromo sulla quale vengono disposti dei segnali per fornire specifiche informazioni agli aeromobili in volo nel circuito di traffico aeroportuale o nelle sue vicinanze. I segnali rappresentano simbolicamente delle informazioni di particolare utilità e sono adagiati sul terreno del quadrato in modo da essere ben visibili dall'alto. (it)
- Het seinenvierkant is een vierkant gebied van ten minste 12,8 bij 12,8 meter (42 voet) op de grond van een luchtvaartterrein, dat gemarkeerd wordt met een witte rand. Een dergelijk vierkant wordt gebruikt voor het optisch weergeven van grondsignalen, die leesbaar zijn vanuit overvliegende vliegtuigen. Het seinenvierkant bevat grondsymbolen om de omstandigheden op het luchtvaartterrein visueel aan te geven aan overvliegende vliegtuigen. Deze wijze van communicatie is ingevoerd in de tijd dat vliegtuigen nog geen gebruik konden maken van radiocommunicatie. Sinds de jaren '50 is het seinenvierkant geleidelijk in onbruik geraakt, en vervangen door elektronische communicatiemiddelen. (nl)
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- Il quadrato segnali, in inglese signal area o signal square, è un'area all'interno di un aerodromo sulla quale vengono disposti dei segnali per fornire specifiche informazioni agli aeromobili in volo nel circuito di traffico aeroportuale o nelle sue vicinanze. I segnali rappresentano simbolicamente delle informazioni di particolare utilità e sono adagiati sul terreno del quadrato in modo da essere ben visibili dall'alto. (it)
- 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.It contains ground symbols to indicate visually the conditions on the aerodrome to over-flying aircraft. There are four basic signals.
* 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.
*
*
*
*
* The right hand circuit indicator.
* Air traffic services reporting office.
*
*
* (en)
- Het seinenvierkant is een vierkant gebied van ten minste 12,8 bij 12,8 meter (42 voet) op de grond van een luchtvaartterrein, dat gemarkeerd wordt met een witte rand. Een dergelijk vierkant wordt gebruikt voor het optisch weergeven van grondsignalen, die leesbaar zijn vanuit overvliegende vliegtuigen. Het seinenvierkant bevat grondsymbolen om de omstandigheden op het luchtvaartterrein visueel aan te geven aan overvliegende vliegtuigen. (nl)
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- Quadrato segnali (it)
- Seinenvierkant (nl)
- Signal square (en)
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