Signal square

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


  1. ^ 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.
  2. ^ "The Signal Square & Other Visual Signals to Aircraft".