Which hydraulic system normally extends and retracts the landing gear?

The hydraulic system that typically extends and retracts the landing gear is the left hydraulic system. This is standard in many aircraft designs, where the left hydraulic system is dedicated to critical functions, including landing gear operation. The left system is often prioritized for tasks that demand reliability and effectiveness due to the importance of landing gear during takeoff and landing phases.

In the context of aircraft hydraulic systems, each system has specific functions. The left hydraulic system, while primarily responsible for landing gear, may also handle other essential operations, such as flight control surfaces and brakes. Knowing which system operates the landing gear is crucial for pilots and maintenance crews when performing pre-flight checks or troubleshooting hydraulic issues.

The right hydraulic system, center hydraulic system, and auxiliary hydraulic system also contribute to the overall functionality of the aircraft but do not normally handle the landing gear operation. Understanding each hydraulic system's designated responsibilities is key to ensuring the proper functioning of the aircraft's systems during operation.