What is the VFE (maximum flap extension speed) when Flaps Full are selected?

What is the VFE (maximum flap extension speed) when Flaps Full are selected?

• A. 170 knots
• B. 175 knots
• C. 180 knots
• D. 165 knots

Answer: (B)

VFE is the maximum speed at which the flaps may be extended to a given setting. For Flaps Full, the placard limit is 175 knots, so you should not fly faster than that with the flaps fully extended. This limit protects the flap mechanism and wing structure from excessive aerodynamic and structural loads during deployment. Choices that are lower than 175 knots would unnecessarily restrict you, while the higher value exceeds the allowable limit and could cause damage if you actually have the flaps full extended. Therefore, 175 knots is the correct maximum for full flap extension.

VFE is the maximum speed at which the flaps may be extended to a given setting. For Flaps Full, the placard limit is 175 knots, so you should not fly faster than that with the flaps fully extended. This limit protects the flap mechanism and wing structure from excessive aerodynamic and structural loads during deployment.

Choices that are lower than 175 knots would unnecessarily restrict you, while the higher value exceeds the allowable limit and could cause damage if you actually have the flaps full extended. Therefore, 175 knots is the correct maximum for full flap extension.