What is V window?

What is V window?

• A. 160
• B. 230
• C. 250
• D. 195

Answer: (A)

The speed window (V window) is the approved range of indicated airspeeds within which the airplane is certified to operate for a specific configuration. It isn’t just a single speed like stall or a maximum speed; it defines a safe band where the airframe and flight controls behave within their tested limits. For the ERJ 175 in the typical limits/test configuration used here, the lower edge of that window sits around 160 knots. Speeds below this would push the airplane toward stall margins or other control issues, while speeds above the window could approach structural or certification limits. The other numbers shown are outside that allowable envelope for the given configuration, so 160 knots represents the lower limit of the V window.

The speed window (V window) is the approved range of indicated airspeeds within which the airplane is certified to operate for a specific configuration. It isn’t just a single speed like stall or a maximum speed; it defines a safe band where the airframe and flight controls behave within their tested limits. For the ERJ 175 in the typical limits/test configuration used here, the lower edge of that window sits around 160 knots. Speeds below this would push the airplane toward stall margins or other control issues, while speeds above the window could approach structural or certification limits. The other numbers shown are outside that allowable envelope for the given configuration, so 160 knots represents the lower limit of the V window.