What should be performed after maintenance on an aircraft's landing gear system?

After maintenance on an aircraft's landing gear system, conducting a pressure test of the hydraulic system is essential to ensure that the system is functioning correctly and safely. This testing checks for any leaks, proper pressure levels, and overall functionality of the hydraulic components that are critical for the landing gear operation. It verifies that the hydraulic fluid is delivered effectively and that all hydraulic lines and components are intact, thus minimizing the risk of failure during landing or takeoff.

Other options may sound reasonable, but they do not specifically address the critical nature of checking hydraulic system integrity after maintenance. While a visual inspection is important, it does not confirm the operational status of the hydraulic systems. An operational check while on jacks is also relevant; however, it would generally follow the pressure testing to verify that the landing gear responds properly when actuated. Tire rotation is not a requirement after landing gear maintenance and does not fall under the specific integrity checks needed for hydraulic systems.