Important parts of our national airspace system (NAS) are the precision landing systems which allow aircraft equipped with the necessary electronic hardware (avionics) to land in conditions of limited visibility,thereby increasing the time an airport can operate during poor weather.
The current precision landing system, the instrument landing system(US), is scheduled to be replaced with the microwave landing system(MLS) as part of the Federal Aviation Administration’s (FAA) ambitious effort to modernize the nation’s air traffic control system-known as the MS plan.