What part of the FARs outlines the airworthiness standards for Transport Category airplanes?

The Federal Aviation Regulations (FARs) establish various standards for aviation safety and operations, and specific parts of these regulations address different types of aircraft and their respective requirements. For Transport Category airplanes, the relevant part is FAR Part 25, which outlines the airworthiness standards necessary for these larger, multi-engine commercial aircraft that are typically designed to carry passengers or cargo.

FAR Part 25 encompasses a wide range of requirements, including structural integrity, flight performance, systems and equipment, and safety features that must be met for type certification. This part is critical because it ensures that Transport Category planes are capable of operating safely under a variety of conditions and scenarios they may encounter in commercial service.

In contrast, other parts of the FARs address different categories of aircraft or operational regulations. For instance, FAR Part 23 is focused on the airworthiness standards for smaller general aviation airplanes, while FAR Part 43 outlines the maintenance and alteration requirements for all aircraft. FAR Part 91 provides rules for the operation of aircraft in general aviation, including regulations related to how pilots should operate their aircraft rather than standards for airworthiness. Therefore, Part 25 is the designated portion that specifically pertains to the airworthiness of Transport Category airplanes.