Which flap setting corresponds to 170 knots?

Which flap setting corresponds to 170 knots?

• A. Flaps 1
• B. Flaps 8
• C. Flaps 20
• D. Flaps 45

Answer: (D)

When a flap setting is extended, there is a maximum operating speed you must not exceed, known as V_FE. The more the flaps are extended, the lower that maximum speed becomes because of the drag and lift characteristics involved. For the CRJ-550, the full-flaps configuration (flaps 45) has the placard speed of about 170 knots. So if you’re flying at 170 knots and you need to stay within the safe limit with the flaps extended, the correct choice is the full-flaps setting. The other flap settings allow higher speeds before reaching their limits, so they wouldn’t align with a 170-knot condition.

When a flap setting is extended, there is a maximum operating speed you must not exceed, known as V_FE. The more the flaps are extended, the lower that maximum speed becomes because of the drag and lift characteristics involved. For the CRJ-550, the full-flaps configuration (flaps 45) has the placard speed of about 170 knots. So if you’re flying at 170 knots and you need to stay within the safe limit with the flaps extended, the correct choice is the full-flaps setting. The other flap settings allow higher speeds before reaching their limits, so they wouldn’t align with a 170-knot condition.