Red Runway End Light

A Red Runway End Light is a critical runway lighting fixture that provides red visual guidance to pilots approaching the end of the runway. These lights are installed at the runway end and are part of the runway lighting system. The red colour indicates to pilots that they are approaching the end of the runway and that the runway surface is about to end. Red runway end lights are an essential safety component, clearly marking the runway terminus and providing a definitive visual cue that the runway surface is ending.

The red colour of this fixture exists to give pilots a terminal warning that is impossible to confuse with any other signal on the airfield: red is reserved specifically for "runway ends here" across the lighting system, so its meaning is unambiguous the moment it comes into view. This matters most during rollout after landing, when a pilot needs an immediate, reliable cue of how much stopping distance remains, and during takeoff, where it marks the absolute limit of usable pavement if the takeoff must be rejected. Because judging the physical end of a runway visually is difficult at night or in poor visibility, this dedicated red marker removes the guesswork from what is otherwise a critical safety margin.

Red runway end lights are installed at the runway end on all paved runways that support night operations. They are used on:

• All paved runways supporting night operations
• Precision approach runways (CAT I, II, and III)
• Non-precision runways where night operations are conducted
• Runways with displaced thresholds requiring end identification
• Military airfields requiring clear runway terminus identification

Fixtures are installed in a row across the full width of the runway at the runway end, spaced evenly on each side of the centreline in line with the runway edge lights, so the row reads as a continuous red bar marking the end of the usable pavement. Each light mounts on an L-868 base can recessed flush with the pavement or shoulder (or on a frangible elevated stem where the end abuts a soft surface), sealed against surface water, with cabling run in pavement ducting or shoulder trenching back to the isolating transformer serving the runway end circuit. Fixtures are unidirectional, angled so the red beam faces back along the runway toward an aircraft on its landing or take-off roll, with the reverse face blanked or fitted with a green lens where the same base can also serves as the opposite runway's threshold. Setting-out is tied to the runway end survey mark so the light line remains square to the centreline and coincides exactly with the edge of the usable landing surface.

Red runway end lights operate as part of the runway lighting system:

• Installation: Red runway end lights are installed at the runway end, typically in a row across the runway width, with spacing not exceeding 3 metres between lights.
• Lighting: The lights are red and project a uni-directional beam towards the approaching aircraft, providing a clear visual reference of the runway end.
• Guidance: The red lights indicate to the pilot that they are approaching the end of the runway and that the runway surface is about to end.
• Integration: Red runway end lights are integrated with threshold lights, edge lights, and other runway lighting components.

Red runway end lights sit on the same constant current series circuit as the runway edge lights, and control is exercised at exactly the same loop level: the ALCMS or tower selects a brightness step, the CCR regulates the whole loop to that fixed current, and every fixture — edge lights and end lights alike — burns at the same intensity simultaneously. There is no switch that energises the red lens independently of the loop. Where the same base can also serves as the opposite runway's threshold, colour separation is done optically rather than electrically: a single lamp or LED source sits behind a two-way lens, red facing back along the runway and green facing the opposite direction, so both colours are lit together whenever the loop is energised — there is no separate drive circuit per lens face. This has a direct consequence for fault diagnosis: because a shared fixture has one lamp element and one isolating transformer, a lamp or transformer failure darkens both the red and green faces at once, and the CCR sees it as the same loop-voltage-rise fault it would report for a plain edge light, with no way to tell which lens face has actually failed without a physical inspection.

The fixture body is a die-cast aluminium alloy housing, machined and anodised or powder-coated for corrosion resistance against runway de-icing fluids, fuel spillage, and UV exposure. A red-filtered borosilicate glass or high-strength polycarbonate lens sits over the optical assembly, gasket-sealed to the housing with an O-ring or silicone seal to achieve an IP67/IP68 rating against water and dust ingress, and internally baffled so the beam is visible only from the approach side. Elevated units bolt to a frangible coupling engineered to shear cleanly under aircraft impact loads, seating on an L-867 base can flush with the surrounding grade; inset (flush) units instead seat directly into an L-868 base can recessed into the pavement, with the top surface load-rated for aircraft wheel loading. Internal wiring terminates at L-823 primary connectors, sealed splice connectors rated for direct burial and continuous immersion, which mate to the secondary leads of the isolating transformer housed in its own nearby base can. Stainless-steel fasteners are used throughout, and the base can assembly includes a drainage provision to prevent water pooling around the transformer and cable entry points.