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Signal square

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Signal square
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A signal square is aerodrome equipment defined internationally at annex 14 of the Convention on International Civil Aviation by the International Civil Aviation Organization.[1]

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Signal square at Manchester Barton Aerodrome in England (23 June 2024) showing the landing direction, right hand circuit, and ground conditions (grass runways and taxiways)

It contains ground symbols that visually indicate aerodrome conditions to over-flying aircraft.[2] There are four basic signals.[3]

In the UK, the internal sides of the square should measure 12 metres, "bordered by a white strip 30 centimetres wide"[4] and "so located on the aerodrome that it is visible from all approach directions."[5] According to Schedule 1, Section 9 of the Rules of the Air Regulations 2007, further illustrates the dimensions of each particular signal, e.g. both arms of the landing T should be 4 metres long and 40cm thick, and the dumbbell sign should consist of three sections, each 1.5m long. The sides of the red panel with the yellow cross should be 3m, with the crossing lines being 50cm wide. All dimensions shall be "subject to a tolerance of 10 per cent, plus or minus."[4] The same documents include the H sign, which indicates a landing area for helicopters, commonly used on a helipad (but not a circle around the letter H), and this should be displayed in the Signals Area.[5][4] According to the UK Civil Aviation Authority, these visual aids can be used at aerodromes with significant general aviation movements.[5]

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