Which statement correctly describes how stall speed changes with flap extension, weight, and bank angle in a turn?

• A. Stall speed decreases when flaps are extended due to higher lift; it increases with weight and also increases with bank angle in a turn.
• B. Stall speed increases when flaps are extended and decreases with weight.
• C. Stall speed is independent of weight.
• D. Stall speed decreases with weight.

Answer: (A)

Stall speed is about the lift needed to support the airplane’s weight. When you stall, lift equals weight, so anything that changes required lift or available lift will change stall speed.

Extending flaps increases the wing’s lift capability at lower speeds by increasing camber and lift coefficient. That means you can fly slower before reaching the stall, so stall speed goes down with flap extension.

Increasing weight raises the wing loading, so more lift is needed to hold the same flight, which means you must fly faster to generate that lift. Thus stall speed goes up with weight.

In a turn, especially a coordinated level turn, you must generate more lift to counteract the weight component and maintain altitude. The load factor increases with bank angle, so the stall speed rises as the bank angle increases.

Putting it together, stall speed decreases with flap extension, increases with weight, and increases with bank angle in a turn. This is why the described combination is the correct statement.