Originally Posted by
Sailvi767
If all landings were Cat3B you would need to vastly reduce the numbers of operations at most if not all airports.
You are talking in terms of the obsolescent ILS where there are concerns over multipath effects with aircraft ahead and even on the ground close to the runway. GLS, GBAS and the capabilities such as Established on RNP have no such issues. The retention of ILS is a huge hidden cost for airports. Runway acceptance rate is reduced in IFR operations and the cost of calibration of a single runway ILS exceed the cost of ownership of a GBAS that will provide GLS to every runway end at the airport. ANSPs should issue an NPRM to withdraw ILS by say 2025