What are Runway End Identifier Lights (REIL) and what are they used for?
Answer
REILs are a pair of synchronized flashing lights located on each side of the runway threshold. They are used to rapidly identify the approach end of a runway, particularly when the runway is surrounded by other lighting, lacks contrast with surrounding terrain, or when visibility is reduced.
AIM 2-1-3
Read the full regulation — AIM 2-1-3
2-1-3. Runway End Identifier Lights (REIL) REILs are installed at many airfields 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. They are effective for: a. Identification of a runway surrounded by a preponderance of other lighting. b. Identification of a runway which lacks contrast with surrounding terrain. c. Identification of a runway during reduced visibility.
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