| 词条 | Signal square |
| 释义 |
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] References1. ^{{cite book |title=Aerodromes : international standards and recommended practices |volume=Volume I — Aerodrome Design and Operations |author=International Civil Aviation Organization. Council. |publisher=International Civil Aviation Organization |location=Montréal |series=Annex ... to the Convention on International Civil Aviation |edition=5th |url=http://www.icao.int/icao/en/sales/cat_2009_2010_revised_edition_en.pdf |date=July 2009 |isbn=978-92-9231-332-6}} {{aviation-stub}}2. ^{{cite web |url=http://www.airwaysmuseum.com/Signal%20Square.htm |title=The Signal Square & Other Visual Signals to Aircraft}} 1 : Air traffic control |
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