What visibility changes are made on ILS RWY 27 for an aircraft approaching at 120 knots with ILS inoperative?

In the context of an Instrument Landing System (ILS) approach, visibility requirements can differ based on whether the ILS is operational or inoperative. When an aircraft is approaching a runway with an inoperative ILS, the visibility criteria are often set within specific limits to ensure safety during the approach, especially for low visibility conditions.

For ILS RWY 27, if the ILS is not functioning and an aircraft is approaching at a speed of 120 knots, requiring a specific minimum visibility is essential. The standard visibility requirement in this scenario is typically represented as Runway Visual Range (RVR).

The correct choice indicates a visibility of RVR 4000. This standard may apply to operations under certain conditions, typically where pilots need to rely on visual references rather than ILS guidance. When the ILS is inoperative, pilots are trained to rely on RVR figures that ensure they can safely approach and land the aircraft. An RVR of 4000 is a reasonable minimum, allowing the approach and landing to be conducted safely, given the circumstances of the ILS outage.

Therefore, this adequately reflects a reasonable expectation of visibility for safe operations under the given conditions, ensuring that the pilots maintain visual control for a safe landing even without