What does the nose landing gear require before it can be retracted?

The nose landing gear requires centering of the nose wheel before it can be retracted. This process ensures that the wheel is positioned properly for retraction, which is crucial for safe and efficient operation of the aircraft. If the nose wheel is not centered, it could lead to mechanical issues during the retraction process, potentially causing damage to the landing gear system or leading to unsafe flight conditions. Centering allows the gear mechanism to function correctly and minimizes the risk of misalignment as the landing gear is stowed in the aircraft’s fuselage.

The other options do not address the specific requirement for retraction. Manual adjustment may be needed under certain circumstances, but it is not a standard prerequisite for retraction. A landing check typically involves a series of inspections and verifications to ensure the aircraft is ready for takeoff, but isn’t specifically focused on the landing gear's positioning. Temperature reduction, while important for various mechanical systems, does not directly relate to the retraction process of the nose landing gear.