What type of approach is indicated when an ILS frequency is available?

When an ILS (Instrument Landing System) frequency is available, it indicates a precision approach. An ILS provides precise lateral and vertical guidance to aircraft during the landing phase, allowing them to approach the runway with a high degree of accuracy. This system includes both localizer and glideslope components, enabling pilots to align properly with the runway and descend at the correct angle.

In contrast, other types of approaches do not offer the same level of precision. A visual approach relies on pilots using their own visual references to land, while standard instrument departures are procedures for departing an airport. Non-precision approaches, such as VOR or NDB approaches, provide lateral guidance but lack the vertiginous guidance that ILS offers, making them less accurate compared to precision approaches like an ILS. Thus, the availability of an ILS frequency clearly indicates that a precision approach is appropriate.