Editing Runway (section)

==Declared distances==
<!-- Disambiguation pages and redirects link to this section. --><!-- Which ones? They need to be listed here. --><!-- Runway declared distances should ultimately be given their own separate article on wiki. It is very ineffective to make outside links to one of declared runway distances from other pages to part of this page. -->
Runway dimensions vary from as small as {{convert|245|m|abbr=on|0}} long and {{convert|8|m|abbr=on|0}} wide in smaller [[general aviation]] airports, to {{convert|5500|m|abbr=on|0}} long and {{convert|80|m|abbr=on|0}} wide at large [[international airport]]s built to accommodate the largest [[Jet airliner|jets]], to the huge {{convert|11917|x|274|m|abbr=on|0}} lake bed runway 17/35 at [[Edwards Air Force Base]] in California – developed as a landing site for the [[Space Shuttle]].<ref>{{FAA-document|00500ADROGERSLAKEBED|Edwards AFB Rogers Lakebed Airport Diagram}}. [[Federal Aviation Administration]].</ref>

Takeoff and landing distances available are given using one of the following terms:

* {{anchor|Takeoff Run Available|TORA}} '''Takeoff Run Available (TORA)'''<ref name="Contractions">{{cite web|url=http://www.faa.gov/documentLibrary/media/Order/ND/7340.1Z.pdf|title=Order JO 7340.1Z: Contractions|publisher=[[Federal Aviation Administration]]|date=March 15, 2007}}</ref><ref name=":0">{{Cite book|title=ICAO Annex 14, Aerodrome Design and Operations Vol 1.|publisher=ICAO|year=2016|isbn=978-92-9258-031-5|pages=Chapter 1-Definitions, Chapter 2.8-declared distances, Attachment A section 3}}</ref> – The length of runway declared available and suitable for the ground run of an airplane taking off.<ref name="FAR25.189(c)">{{Citation | title = Airplanes: Turbine engine powered: Takeoff limitations | url = http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgFAR.nsf/0/07C875546A87CBCD852566EF006B2242?OpenDocument | access-date =2009-10-04}}</ref>
* {{anchor|Clearway|Takeoff Distance Available|TODA}} '''Takeoff [[Distance]] Available (TODA)'''<ref name="Contractions" /><ref name=":0" /> – The length of the takeoff run available plus the length of the [[Clearway#Aviation|clearway]], if clearway is provided.<ref name="FAR25.189(c)" /> (The clearway length allowed must lie within the aerodrome or airport boundary. According to the [[Federal Aviation Regulations]] and [[Joint Aviation Requirements]] (JAR) TODA is the lesser of TORA plus clearway or 1.5 times TORA).
* {{anchor|Stopway|Accelerate-Stop Distance Available|ASDA}} '''Accelerate-Stop Distance Available (ASDA)'''<ref name="Contractions" /><ref name=":0" />{{nbsp}}– The length of the takeoff run available plus the length of the stopway, if stopway is provided.<ref name="FAR25.189(c)" />
* {{anchor|Landing Distance Available|LDA}} '''Landing Distance Available (LDA)'''<ref name="Contractions" /><ref name=":0" /> – The length of runway that is declared available and suitable for the ground run of an airplane landing.<ref>{{Citation | title = Airplanes: Turbine engine powered: Landing limitations: Destination airports | url = http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgFAR.nsf/0/4063CEA6723EAC38852566EF006B269B?OpenDocument | access-date =2009-10-04}}</ref>
* {{anchor|Emergency Distance Available|EMDA}} '''Emergency Distance Available (EMDA)'''<ref name=EMDA>{{cite book|last1=Swatton|first1=Peter J.|title=Aircraft Performance Theory for Pilots|date=2000|publisher=Blackwell Science Ltd|location=Oxford, United Kingdom|isbn=0632055693|page=vii|edition=illustrated, reprint|url=https://books.google.com/books?id=WIstCwAAQBAJ}}</ref> – LDA (or TORA) plus a stopway.