What document contains specifications and data for certificated aircraft when the number of registered aircraft is 50 or fewer?

The document that contains specifications and data for certificated aircraft when the number of registered aircraft is 50 or fewer is referred to as Aircraft Listings. This document provides essential details such as design, performance attributes, and operational capabilities specifically tailored for a limited number of aircraft. When there are fewer than 50 registered aircraft, the regulatory requirements lean towards more specialized documentation like Aircraft Listings to ensure that all necessary details pertaining to safety and operation are efficiently compiled for easier access by operators, maintenance personnel, and regulatory agencies.

In contrast, Aircraft Specifications generally refer to the technical descriptions and qualities of an aircraft but may not be organized in the same style as Aircraft Listings, especially when it comes to the context of smaller registries. Airworthiness Directives are directives issued by aviation authorities related to safety issues and maintenance requirements rather than comprehensive specifications of aircraft. Manufacturer's Published Data includes information published by the manufacturer but is broader and may not always be compiled specifically for regulatory compliance in the limited scenario of fewer than 50 registered aircraft.