Answer :
Final answer:
Small air strips are associated with Nonprecision instrument runways, which are found at smaller airports and do not have the advanced systems of precision instrument runways. These runways cater to aircraft using visual or basic instrument flight rules.
Explanation:
the types of runways used at airports, particularly focusing on small air strips. The correct answer is b) Nonprecision instrument runways. Nonprecision instrument runways are typically found at smaller airports and lack the sophisticated approach aids and lighting systems found on precision instrument runways. These runways are designed for aircraft that are guided by visual flight rules (VFR) and basic instrument flight rules (IFR) when visibility is moderate to poor.
Visual runways, on the other hand, are primarily for use under visual flight rules with good weather conditions and visibility, while precision instrument runways are equipped with high-tech navigation aids for use in almost all weather conditions. Visual approach runways do not exist as a distinct category; instead, approaches to runways are either visual, instrument (nonprecision or precision), or a combination of both.