ATC AP Characteristics Practice Test

REIL may be configured in which orientation toward the approach area?

Omnidirectional Unidirectional facing the approach area Both omnidirectional and unidirectional Neither

Correct Answer:

Both omnidirectional and unidirectional

Explanation:

Runway End Identifier Lights are designed to help pilots quickly identify the threshold and can be set to flash toward the approach area in either of two ways. They can be oriented unidirectionally, facing the approach path so the signal is directed at arriving aircraft, or they can be omnidirectional, flashing in all directions so they’re visible from a wider range of angles. The choice depends on the airport’s layout and approach geometry; some installations favor omnidirectional to ensure visibility from multiple approach angles, while others use unidirectional to concentrate the signal along the intended approach and reduce glare for other traffic. Because REILs can be configured in either orientation toward the approach area, both options are possible.

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