thumb|upright|Runway end identifier lights [[File:Final-Approach-Teterboro.webm|thumb|REIL installed near the runway 19 threshold at Teterboro Airport as seen from an approaching aircraft]]
'''Runway end identifier lights''' ('''REIL'''<ref>{{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>) (ICAO identifies these as Runway Threshold Identification Lights) are installed at many airports to provide rapid and positive identification of the approach end of a particular runway. The system consists of a pair of synchronized flashing lights located laterally on each side of the runway threshold. REILs may be either omnidirectional or unidirectional facing the approach area.<ref name="Airport Lighting Aids">[http://www.faa.gov/air_traffic/publications/atpubs/aim/Chap2/aim0201.html FAA Aeronautical Information Manual, Chapter 2 (Aeronautical Lighting and Other Airport Visual Aids), Section 1 (Airport Lighting Aids)] {{webarchive|url=https://web.archive.org/web/20090904034137/http://www.faa.gov/air_traffic/publications/ATpubs/AIM/Chap2/aim0201.html |date=2009-09-04 }}</ref> They are effective for:<ref name="Airport Lighting Aids" /> * Identification of a runway surrounded by a preponderance of other lighting * Identification of a runway which lacks contrast with surrounding terrain * Identification of a runway during reduced visibility
The International Civil Aviation Organization (ICAO) recommends that:<ref name="annex14e3">{{cite web |url = http://legacy.icao.int/fsix/_Library%5CManual%20Aerodrome%20Stds.pdf |title = Aerodrome Design and Operations |date = July 1999 |edition = 3 |url-status = dead |archiveurl = https://web.archive.org/web/20120723004923/http://legacy.icao.int/fsix/_Library/Manual%20Aerodrome%20Stds.pdf |archivedate = 2012-07-23 }} §5.3.8, "Runway threshold identification lights"</ref> * Runway threshold identification lights should be installed: ** at the threshold of a non-precision approach runway when additional threshold conspicuity is necessary or where it is not practicable to provide other approach lighting aids; and ** where a runway threshold is permanently displaced from the runway extremity or temporarily displaced from the normal position and additional threshold conspicuity is necessary. * Runway threshold identification lights shall be located symmetrically about the runway centre line, in line with the threshold and approximately 10 meters outside each line of runway edge lights. * Runway threshold identification lights should be flashing white lights with a flash frequency between 60 and 120 per minute. * The lights shall be visible only in the direction of approach to the runway.
==References== {{Reflist}}
==External links== * [https://web.archive.org/web/20090712031134/http://www.faa.gov/air_traffic/publications/ATpubs/AIM/ FAA Aeronautical Information Manual]
Category:Airport lighting