What is the purpose of verifying REILs during airfield NAVAID inspections?

The purpose of verifying REILs (Runway End Identifier Lights) during airfield NAVAID (Navigational Aids) inspections is primarily to confirm they are operationally timed. REILs are crucial for providing visual cues to pilots, especially during the approach and landing phases of flight.

Operational timing ensures that the lights are flashing at the correct intervals, which helps pilots to identify the runway and enhances the safety of landings, particularly in low visibility conditions. If the lights are not functioning properly or are out of sync, it could lead to confusion or misjudgment by the pilots.

While assessing their visibility during daylight is an important factor, the specific timing of the lights is vital for their effectiveness regardless of day or night conditions. Thus, confirming that REILs are operationally timed is a key element in ensuring that they serve their intended purpose effectively for aviation safety.