Which of the following is NOT a type of non-precision approach?

The correct option identifies ILS (Instrument Landing System) as a type that does not belong in the category of non-precision approaches. Non-precision approaches are typically characterized by the use of navigational aids that provide lateral guidance only, without the vertical guidance that is crucial for accurately determining altitude during descent.

ILS, on the other hand, is a precision approach system that offers both lateral and vertical guidance, significantly enhancing the accuracy of the aircraft’s approach and landing procedures. This system utilizes a localizer for lateral position information and a glide slope for vertical information, allowing pilots to align the aircraft with the runway and descend safely.

LOC (Localizer), NDB (Non-Directional Beacon), and VOR (VHF Omnidirectional Range) approaches provide only lateral guidance without any vertical reference, categorizing them as non-precision approaches. Each of these makes use of ground-based navigational aids to assist with the approach but does not include the necessary components to facilitate a precision descent. This distinction is vital in understanding the differences in approach types and their operational implications in aviation.