What regulations govern the requirements for fuel jettisoning when maximum takeoff weight exceeds maximum landing weight?

The correct choice is tied to the specific regulations that address the operational requirements for fuel jettisoning due to the difference between maximum takeoff weight (MTOW) and maximum landing weight (MLW). The relevant regulations are found in Federal Aviation Regulation (FAR) Parts 23 and 25, which cover airworthiness standards for small and transport category airplanes, respectively.

When aircraft are required to reduce weight quickly, often due to an emergency situation or when the aircraft is significantly over its landing weight, the ability to jettison fuel safely and efficiently is essential. Part 23 and Part 25 outline the engineering standards and operational parameters that must be considered in the design and functionality of fuel jettison systems.

While other regulations, such as Part 43 and CAM 4b, pertain to maintenance and approved flight operations, they do not specifically address the requirements for fuel jettisoning in cases where the weight limits are exceeded. This focus on the weight specifications related to aircraft performance, safety standards, and systems design in Parts 23 and 25 makes this the correct answer for understanding the regulatory framework surrounding fuel jettisoning operations.