Which FAR outlines the rules for aircraft operations in controlled airspace?

Part 91 of the Federal Aviation Regulations (FARs) outlines the general operating and flight rules for all aircraft operating in the United States, which includes operations in controlled airspace. This part establishes the baseline requirements for pilots, aircraft operators, and aviation-related activities, including how to behave and function within different classifications of airspace, particularly controlled airspace.

Understanding Part 91 is crucial for pilots, as it covers essential aspects such as aircraft operations, maintenance requirements, and pilot certification. When flying in controlled airspace, which is designated for various reasons including air traffic control and safety, adherence to Part 91 is especially important to ensure orderly and safe operations.

In contrast, the other parts mentioned—Part 23, Part 135, and Part 145—deal with different aspects of aviation. Part 23 refers to airworthiness standards for normal, utility, acrobatic, and commuter category airplanes. Part 135 outlines the operating requirements for commuter and on-demand operations, focusing more on commercial and charter services. Part 145 relates to repair stations and the maintenance of aircraft, rather than the operation of aircraft in various airspace categories. Therefore, while they address important areas of aviation regulation, they do not specifically cover the operational rules