The abbreviation GLS stands for Glide Slope in the military field, especially in the US. You can find more abbreviations starting with GL here. Also take a look at our list with military acronyms.
What does GLS mean in detail?
The glide slope is the ideal descent path of an aircraft during an instrument approach. It is usually inclined at 3 degrees and leads the aircraft from the final approach fix safely to the runway threshold.
How the glide slope works
Instrument landing systems transmit radio beams that define the glide slope. The aircraft’s receivers measure the deviation from the ideal path and display it to the pilot, while the flight director and autopilot can track it automatically. Visual aids such as the glide angle indicator light complement the instruments.
Operational importance
Staying on the glide slope is essential for safe landings: too high means the landing cannot be completed, too low carries the risk of obstacles. Deviations are therefore corrected immediately, and in case of a persistently unstable approach the crew decides on a go-around.
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