instrument landing system (ILS)

instrument landing system (ILS): 1. A radio-navigation system which provides aircraft with horizontal and vertical guidance just before and during landing and, at certain fixed points, indicates the distance to the reference point of landing. [NTIA] [RR] 2. A system of radio navigation intended to assist aircraft in landing which provides lateral and vertical guidance, which may include indications of distance from the optimum point of landing. [JP1]

This HTML version of FS-1037C was last generated on Fri Aug 23 00:22:38 MDT 1996