What should be accomplished before jacking an aircraft?

Before jacking an aircraft, it is crucial to install critical stress panels or plates to ensure structural integrity and safety. These components help to distribute the load and prevent undue stress on the aircraft's structure, which could occur when the aircraft is lifted off the ground. Furthermore, they provide support that is essential in maintaining the design limits of the aircraft during maintenance operations.

Installing these panels or plates is a fundamental safety step that protects the aircraft from potential damage while it is being jacked. It ensures that the aircraft can be safely lifted without compromising its structural integrity, which is critical when performing any maintenance or repairs.

Addressing the other options, removing weight from the wings or checking fuel levels are important safety practices, but they do not directly ensure that the aircraft can be safely jacked. Ensuring the aircraft is fueled does not pertain to the preparation required before jacking and can be more relevant to flight operations or before a flight check. Therefore, the installation of critical stress panels or plates is the most pertinent task to complete before beginning the jacking process.