Will the alternate flap extension switch move the slats and flaps while flying faster than 230 KIAS?

Will the alternate flap extension switch move the slats and flaps while flying faster than 230 KIAS?

• A. Yes
• B. No
• C. Only Slats
• D. Only Flaps

Answer: (B)

The alternate flap extension switch is a back‑up control for extending the wing surfaces, and it is intentionally limited by airspeed to protect the wing and handling. Above 230 KIAS, the alternate system is inhibited, so pulling the switch will not move the slats or flaps. You must slow to 230 knots or below to deploy, and when you do, the system acts to extend the wing surfaces together. In this design, it doesn’t selectively move only one surface at the allowed speed, so it won’t operate above the speed limit.

The alternate flap extension switch is a back‑up control for extending the wing surfaces, and it is intentionally limited by airspeed to protect the wing and handling. Above 230 KIAS, the alternate system is inhibited, so pulling the switch will not move the slats or flaps. You must slow to 230 knots or below to deploy, and when you do, the system acts to extend the wing surfaces together. In this design, it doesn’t selectively move only one surface at the allowed speed, so it won’t operate above the speed limit.