Which option is NOT a published flap configuration speed?

Which option is NOT a published flap configuration speed?

• A. 230 kts
• B. 250 kts
• C. 300 kts
• D. 180 kts

Answer: (C)

Flap configuration speeds are the maximum speeds allowed for each specific flap setting, published in the aircraft’s flight manual to keep the wing within safe structural and aerodynamic limits when flaps are extended. For the Longitude, the published speeds corresponding to different flap positions fall in the lower to mid-chant ranges (around 180, 230, and 250 knots, depending on how much the flaps are deployed). A speed of 300 knots is not published as a flap configuration limit because, with any flaps extended, you would be outside the approved limits well before reaching that speed. You’d either fly in clean configuration at or below the airplane’s maximum operating speed or retract flaps before hitting such a high speed. Therefore, 300 knots isn’t a published flap configuration speed, while the other values are.

Flap configuration speeds are the maximum speeds allowed for each specific flap setting, published in the aircraft’s flight manual to keep the wing within safe structural and aerodynamic limits when flaps are extended. For the Longitude, the published speeds corresponding to different flap positions fall in the lower to mid-chant ranges (around 180, 230, and 250 knots, depending on how much the flaps are deployed). A speed of 300 knots is not published as a flap configuration limit because, with any flaps extended, you would be outside the approved limits well before reaching that speed. You’d either fly in clean configuration at or below the airplane’s maximum operating speed or retract flaps before hitting such a high speed. Therefore, 300 knots isn’t a published flap configuration speed, while the other values are.