What must be checked on the cross shaft of the landing gear?

The cross shaft of the landing gear plays a crucial role in the overall functionality and safety of the mechanism. Checking for integrity and movement is essential because it ensures that the cross shaft is structurally sound and is functioning as intended without any obstructions or issues that could impair landing gear operation.

If the cross shaft is compromised in terms of integrity, such as having cracks or signs of wear, this can lead to failures during landing gear deployment or retraction. Additionally, assessing movement ensures that the cross shaft can rotate or pivot smoothly, allowing for the proper operation of the landing gear system, which is critical for safe takeoffs and landings.

While the other options mention important factors, they do not directly pertain to the most critical assessment needed for maintaining the performance and safety of the landing gear. For instance, weight capacity is relevant but is not specific to the cross shaft itself, and while paint condition can indicate overall maintenance, it does not assess functionality. Connection to the crank handle, while vital for the operation, does not provide a comprehensive view of the cross shaft's overall condition. Thus, focusing on the integrity and movement of the cross shaft is paramount in the inspection process.