Flaps 45 indicates a target airspeed of which value?

• A. 170 KIAS
• B. 150 KIAS
• C. 180 KIAS
• D. 200 KIAS

Answer: (A)

Full flaps at 45 degrees change the wing’s lift and drag so you can fly slower while still staying controllable. The speed you target with that flap setting is chosen to balance enough lift to keep you from stalling, enough energy to reach the runway, and good handling in the approach. For this configuration, about 170 KIAS is the recommended target because it provides a stable, controllable approach with a clear margin above stall.

A speed much lower than that could bring you too close to stall, especially in gusty winds, while speeds higher than that would waste energy and reduce your ability to flare smoothly for landing.