Which of the following is NOT a type of operating equipment list referenced in aviation regulations?

The reasoning for identifying the ATC clearance as the correct answer lies in understanding the purpose of the other options, which are specifically tied to aviation regulations and equipment requirements.

The first option, 91.205, outlines the equipment that must be onboard for certain types of operations under Part 91 of the Federal Aviation Regulations. It serves as a critical reference for pilots to understand what equipment is mandated for specific flight conditions.

The second option, 91.213(d), deals with the use of inoperative equipment and outlines the conditions under which a flight can be conducted with certain equipment not functioning, as long as the necessary regulations and procedures are followed. This is also a regulatory form focused on equipment status.

In contrast, the VFR day type certificate refers to a classification that establishes what type of operations can be conducted under Visual Flight Rules during the day, but it is not a list of operating equipment itself.

An ATC clearance, however, is simply an authorization given by air traffic control for a pilot to proceed under specific conditions or routes, wholly separate from equipment lists. It does not pertain directly to equipment requirements related to flight operations and therefore fits as the element that is not a type of operating equipment list referenced in aviation regulations.