Under an FAA cost-cutting proposal, certain ILS approaches, localizer-type directional aids, microwave landing systems and nondirectional beacons at some 25 U.S. airports would no longer be monitored by ATC or FSS due to their low annual activity or because they are not authorized for alternate airport filing when the control tower is closed. It will therefore be up to pilots to report signal discrepancies to the FAA. The agency said unmonitored navaids will be annotated as such on navigation charts.