Final answer:
A Category II ILS limitation may be removed when the aircraft and aircrew are certified for Category II operations, the airport has the necessary certified ILS equipment, the air traffic control is trained for such operations, and all conditions are approved by the aviation authority.
Step-by-step explanation:
A Category II ILS limitation may be removed when specific criteria are met regarding both the equipment used for the Instrument Landing System (ILS) and the operational procedures in place. Category II approaches are precision approaches conducted with a decision height lower than 200 feet above touchdown but not lower than 100 feet, and a runway visual range (RVR) not less than 1,200 feet.
For the limitation to be removed, the following conditions typically need to be fulfilled: The aircraft and aircrew must be certified for Category II operations. This includes having the necessary equipment on board the aircraft that meets the required specifications for Category II ILS approaches, and the aircrew must have received specialized training and demonstrated proficiency in conducting these types of approaches.
Additionally, the airport must also meet certain standards, such as having certified ILS equipment for Category II approaches, including necessary ground infrastructure like lighting, marker beacons, and proper runway markings. Furthermore, there must be an established airport operating procedure for Category II conditions and the air traffic control must be trained to handle such operations.
Other considerations include the performance of regular maintenance and verification of the ILS equipment to ensure it is functioning correctly, as well as having appropriate weather monitoring systems to assess the RVR accurately. Once these requirements are satisfied and the regulatory body, typically the country's aviation authority or an international body such as ICAO or FAA, approves the setup, the Category II ILS limitation may be lifted, allowing for Category II approaches to be conducted at that airport.