Runway End Identifier Lights (REIL)These lights are a system of two synchronized, unidirectional flashing lights placed on each corner of the runway end. These are used to aid pilots in identifying the end of the runway.
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The FAR that deals specifically with aircraft lights, § 91.209(b), provides that no person may “operate an aircraft that is equipped with an anticollision light system, unless it has lighted anticollision lights.” There is an exception allowing the pilot-in-command to determine that, “in the interest of safety,” ...
A threshold marking consists of eight white stripes arranged evenly on the runway centerline and start twenty-feet from the runway threshold. These markings identify the beginning of the runway that is suitable for landing. As you get closer to the gate there are yellow numbers that identify the number of the gate.
In VFR conditions, no there is no restriction against landing in an airport where runway edge lighting or other airport lighting is not lit at night. That being said, without any visual references, it may be very difficult to locate where runway is or judge or hide above the runway in order to land.