What is one requirement for an aircraft furnished for a practical test?

The requirement concerning aircraft furnished for a practical test dictates that it must have no prescribed operating limitations that prohibit its use in any required area of operation. This is critical because, during a practical test, the applicant needs to demonstrate their proficiency across various maneuvers and operations as dictated by the testing standards. If the aircraft has limitations that prevent it from being flown in certain conditions or performing specific maneuvers, this could hinder the evaluation of the applicant's skills and understanding of the required areas of operation, potentially invalidating the examination process.

Regarding the other options, having a valid registration is necessary although it doesn't directly affect the testing process itself. While dual controls can enhance safety and teaching effectiveness, they are not an absolute requirement for all tests, since certain aircraft can be safely operated without them. Additionally, the model of the aircraft must generally be approved for flight training, but this is not a direct semblance to limitations on its operational capabilities during the test. Therefore, the integrity of the aircraft's operational capabilities is indeed the most pertinent requirement during a practical test.