Plain English Meaning

A landing approach where two radio beams from the airport guide the aircraft straight in toward the runway and down at the correct angle, so the pilot can find the runway in low visibility by following cockpit needles.

Full Definition

A precision instrument approach procedure that uses ground-based radio signals to guide an aircraft along a precise lateral path (the localizer) and a precise descent path (the glide slope) to a specific runway. The pilot follows cockpit instrument indications generated from these signals down to a published , at which the must be visually identified to the .