Which types of aircraft are governed by CS 25?

CS 25 refers to the certification specifications for large passenger airplanes established by the European Union Aviation Safety Agency (EASA). This regulation primarily applies to multi-engine aircraft designed to carry a substantial number of passengers and/or cargo.

The correct answer outlines that all multi-engine jets and multi-engine turboprop aircraft with more than 9 passenger seats are governed by CS 25. This regulatory framework is crucial for ensuring that these larger aircraft meet stringent safety standards due to their design complexity, higher performance capabilities, and the number of people they carry, which necessitates thorough safety evaluations and design criteria.

Single-engine jets and gliders, military fighter jets, and light sport aircraft all have different sets of regulations that apply to their specific types and operational roles. Hence, they do not fall under the purview of CS 25, which is specific to larger transport aircraft. This understanding emphasizes the importance of knowing regulatory classifications and their applicability based on aircraft design and intended operational use.