Which of the following is NOT a type of runway approach?

A runway approach typically refers to the methods used to align and guide an aircraft towards landing. There are various types of approaches, each with specific requirements and capabilities based on visibility, equipment, and procedure.

Visual approaches are used when pilots can see the runway and are able to navigate visually to land, often requiring good weather conditions. Non-precision approaches utilize navigational aids that do not provide the same level of guidance as precision approaches; these often include specific altitudes and lateral positioning without vertical guidance. Precision approaches, on the other hand, provide both lateral and vertical guidance, typically through an Instrument Landing System (ILS), allowing for more accurate landings in lower visibility.

The term "complex" does not refer to a standard type of runway approach. Instead, it may be used informally or in other contexts to describe situations or approaches that involve multiple components or challenges, but it is not recognized as a formal category of runway approach in aviation terminology. Thus, identifying "complex" as not a type of runway approach is based on the established definitions and classifications used in aviation.