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