What needs to be done before manually folding the wings?

Before manually folding the wings, it is crucial to remove the wing pins and set the breakers. This process ensures safety and proper functioning when folding the wings. The wing pins are hardware that locks the wings in place during flight, and if they are not removed, the wings cannot be folded without risking damage to the aircraft or causing an accident. Setting the breakers, which involves configuring the aircraft's electrical system to allow for wing operations, is equally important. This ensures that the wing folding mechanism can operate without any electrical interference or potential hazards.

Addressing the other options provides clarity on their significance but demonstrates why they are not prerequisites for folding the wings. Checking fuel levels is important for overall safety and operational readiness but does not directly relate to the wing folding process. Securing cargo is crucial for flight stability but is not specifically tied to wing operations. Inspecting the landing gear is essential for pre-flight checks and safety, yet it does not affect the ability to fold the wings manually. Thus, the correct action directly associated with wing folding preparation involves the removal of pins and appropriate electrical configurations.