Using 10° flaps will shorten ground run distance by which percentage?

Using 10° flaps will shorten ground run distance by which percentage?

• A. Shorten ground run distance by 10%
• B. Increase climb rate
• C. No effect on ground run distance
• D. Shorten ground run distance by 5%

Answer: (A)

Deploying flaps increases wing camber and lift at lower speeds, so you reach the lift-off condition at a lower airspeed. That lets the airplane become airborne sooner and reduces how far you must taxi down the runway. With a 10° flap setting, the extra lift at takeoff typically shortens the ground run by about 10% compared with takeoff flaps up, assuming weight, power, and runway conditions are the same. The flap drag is a factor, but the lift gain is the dominant reason for a shorter takeoff roll. The other options describe effects that aren’t about how far you roll on the ground, or they state no effect, which doesn’t align with the lift change flaps provide.

Deploying flaps increases wing camber and lift at lower speeds, so you reach the lift-off condition at a lower airspeed. That lets the airplane become airborne sooner and reduces how far you must taxi down the runway. With a 10° flap setting, the extra lift at takeoff typically shortens the ground run by about 10% compared with takeoff flaps up, assuming weight, power, and runway conditions are the same. The flap drag is a factor, but the lift gain is the dominant reason for a shorter takeoff roll. The other options describe effects that aren’t about how far you roll on the ground, or they state no effect, which doesn’t align with the lift change flaps provide.