UNSPSC 25173115: Instrument Landing System (ILS)

In aviation, the instrument landing system (ILS) is a radio navigation system that provides short-range guidance to aircraft to allow them to approach a runway at night or in bad weather. In its original form, it allows an aircraft to approach until it is 200 feet (61 m) over the ground, within a 1?2 mile of the runway. At that point the runway should be visible to the pilot; if it is not, they perform a missed approach. Bringing the aircraft this close to the runway dramatically improves the weather conditions in which a safe landing can be made.

Later versions of the system, or "categories", have further reduced the minimum altitudes.

UNSPSC 25173115 Instrument Landing System (ILS), a Commodity code, shows no recent state and local procurement activity aligned with its nominal scope. The recent opportunities tagged to this code span water utility testing and laboratory services, wastewater equipment, electrical components, and various vendor networking events—none involve instrument landing systems, aviation ground support, or related aeronautical infrastructure.

The mismatch between code and actual procurement content indicates that 25173115 does not currently reflect active state and local buying patterns. State and local issuing bodies—counties, cities, water utilities, and transit authorities across Florida, Texas, Arizona, Connecticut, California, New Mexico, Kansas, Illinois, and other states—are posting opportunities in laboratory services, SCADA upgrades, predictive maintenance, personal protective equipment, and specialized monitoring systems, but none under the ILS taxonomy. Unless there is a consistent tagging error in the source system, this code warrants monitoring rather than active pursuit at this time.