Where are Runway End Identifier Lights (REIL) located?

Where are Runway End Identifier Lights (REIL) located?

• A. On each side of the runway threshold at the approach end.
• B. At the far end of the runway.
• C. Along the taxiway.
• D. On the runway mid-point.

Answer: (A)

Runway End Identifier Lights provide a quick, positive cue of where the runway begins by flashing on each side of the threshold at the approach end. This placement ensures pilots can clearly identify the threshold and align with the runway during the final approach, even in low visibility. If the lights were at the far end, along a taxiway, or at the midpoint, they wouldn’t reliably mark the threshold the way REIL are designed to do. The setup of flashing lights on both sides of the threshold at the approach end is exactly how REIL function to aid threshold identification.

Runway End Identifier Lights provide a quick, positive cue of where the runway begins by flashing on each side of the threshold at the approach end. This placement ensures pilots can clearly identify the threshold and align with the runway during the final approach, even in low visibility. If the lights were at the far end, along a taxiway, or at the midpoint, they wouldn’t reliably mark the threshold the way REIL are designed to do. The setup of flashing lights on both sides of the threshold at the approach end is exactly how REIL function to aid threshold identification.