Which item uses the speed limit VMO/MMO?

Which item uses the speed limit VMO/MMO?

• A. RAT Deploy MAX
• B. Vb
• C. V window
• D. Vle

Answer: (A)

VMO/MMO is the ultimate speed limit for the airplane, and the Ram Air Turbine (RAT) has a dedicated deployment limit tied to that ceiling. The RAT Deploy MAX is defined so that RAT deployment must occur below or at VMO/MMO, protecting the RAT mechanism and hydraulics from excessive dynamic pressure. That’s why this item uses the VMO/MMO limit. Other speeds refer to different systems—Vb is maneuv ering speed for gusts, V window is the safe speed range for config changes, and Vle is the maximum speed with the landing gear extended—none of which govern RAT deployment.

VMO/MMO is the ultimate speed limit for the airplane, and the Ram Air Turbine (RAT) has a dedicated deployment limit tied to that ceiling. The RAT Deploy MAX is defined so that RAT deployment must occur below or at VMO/MMO, protecting the RAT mechanism and hydraulics from excessive dynamic pressure. That’s why this item uses the VMO/MMO limit.

Other speeds refer to different systems—Vb is maneuv ering speed for gusts, V window is the safe speed range for config changes, and Vle is the maximum speed with the landing gear extended—none of which govern RAT deployment.