Some aerodromes may use retroreflective markers in place of lights to mark the edges of runways or helipads. These retroreflective markers are approved for use on runways at registered aerodromes only, however, they may be used as a substitute for edge lighting on taxiways or apron areas at some certified airports. Retroreflective markers are to be positioned in the same manner as runway lighting described earlier. Therefore, when the aircraft is lined up on final approach, retroreflective markers will provide the pilot with the same visual representation given by normal runway lighting. A fixed white light or strobe light is also be installed at each end of the runway to assist pilots in locating the aerodrome and aligning the aircraft with the runway.

The approved standard for retroreflective markers requires that they be capable of reflecting the aircraft landing lights so that they are visible from a distance of 2 NM.

Preflight Planning

Pilots are cautioned that the reflective capabilities of retroreflective markers are greatly affected by the condition of the aircraft landing lights, the prevailing visibility, and other obscuring weather phenomena. Therefore, as part of pre-flight planning to an aerodrome that uses retroreflective markers, pilots should exercise extra caution in checking the serviceability of their aircraft landing lights and make provisions for an alternate airport with lighting in case of an aircraft landing light failure.

References

AIM AGA 7.15 – Retroreflective Markers

Previous Topic

Back to Lesson

Next Lesson