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Instrument Landing System (ILS)

antennas flying Boeing 757 runway localizer.

Rolling into position to start the flight air verification.

The procedure to ensure the integrity of signals from the ILS and its fit within the tolerances specified by the manufacturer, also includes a continuum of preventive maintenance, land and scrutineering air.

ground verification, carried out with an ILS receiver equipment transportable by one person, can measure some parameters, but it is impossible to measure, for example, the coverage of runway locator (LOC) or the width of the path sector glide.

Learjet 35 Aircraft Squadron air verification.

Therefore, verification is the air, using an aircraft of radio check, how to know the status of ILS signals in the airspace.

The environment produces effects on system performance as reflections of the signal, "bends", "scalloping" (ripples) or obstruction of the signal (shadowing).

Thus periodically ILS signals must be checked and calibrated if necessary.

specifications and tolerances for flight inspection are regulated in the ICAO Document 8071, Vol.II. It describes the tolerances for the runway localizer and glide path.