A safety valve is installed in the hydraulic system to isolate Green system pressure from the landing gear when the airspeed exceeds 260 knots, or when the landing gear lever is UP.

A safety valve is installed in the hydraulic system to isolate Green system pressure from the landing gear when the airspeed exceeds 260 knots, or when the landing gear lever is UP.

• A. 280 Knots
• B. 240 Knots
• C. 300 Knots
• D. 260 Knots

Answer: (D)

The safety valve serves to keep the Green hydraulic pressure from acting on the landing gear under specific conditions to prevent unintended gear movement and protect the system. When the aircraft is flying fast enough, or when the gear lever is UP (gear stowed), isolating Green pressure helps ensure the gear stays in the correct position and avoids potential hydraulic-induced movement or door loading. 260 knots is the chosen threshold because it marks the speed at which aerodynamic forces and hydraulic behavior could otherwise lead to unwanted gear actions if pressure remained connected. If the speed were defined as anything else, either too low or too high, it could either unnecessarily restrict normal gear operation or fail to protect against undesired movement in high-speed flight. Therefore, the value 260 knots aligns with the system’s safety logic, making sure isolation occurs precisely when needed.

The safety valve serves to keep the Green hydraulic pressure from acting on the landing gear under specific conditions to prevent unintended gear movement and protect the system. When the aircraft is flying fast enough, or when the gear lever is UP (gear stowed), isolating Green pressure helps ensure the gear stays in the correct position and avoids potential hydraulic-induced movement or door loading.

260 knots is the chosen threshold because it marks the speed at which aerodynamic forces and hydraulic behavior could otherwise lead to unwanted gear actions if pressure remained connected. If the speed were defined as anything else, either too low or too high, it could either unnecessarily restrict normal gear operation or fail to protect against undesired movement in high-speed flight. Therefore, the value 260 knots aligns with the system’s safety logic, making sure isolation occurs precisely when needed.