Constant Current Regulators, ALCMS & A-SMGCS Control installations at King Khalid International Airport (RUH)

The control-and-power brain of the airfield lighting system: Constant Current Regulators (CCRs, typically 2.5–30 kW, FAA L-828/L-829) that drive each series loop at a regulated current, plus the Airfield Lighting Control & Monitoring System (ALCMS) and individual light control & monitoring (ILCMS) that let the tower switch, dim and fault-locate every fixture. The same cluster covers FAA L-890 runway-incursion alerting, stop-bar/lead-on logic and A-SMGCS integration with the tower automation platform. Procurement here is engineering-led — specified by loop count, redundancy, monitoring granularity and CAT II/III low-visibility certification — and is usually bought alongside, but separately from, the fixtures themselves.

A sprawling 1980s-era masterplan set in desert pink sandstone, RUH was designed by HOK when Riyadh was still a secondary capital. Four decades later, the city has outgrown it. Terminals 1, 2, 3, 4 and 5 now share the load as traffic hit 37.2 million in 2024, and new carrier Riyadh Air prepares to launch before the airport itself is eclipsed by King Salman International just across town.