During flight, and during gear extension, what is the primary purpose of landing gear doors?

• A. During flight, landing gear doors streamline the airplane and protect the gear; they open to clear the gear path during extension and close to enclose the gear.
• B. Provide extra lift to stabilize the aircraft.
• C. Open automatically only when retracting the gear.
• D. House the landing gear when in flight.

Answer: (A)

The doors’ main job is to keep the airflow clean around the airplane and protect the gear by sealing the wheel wells. In flight they stay closed to minimize drag and shield the gear from debris. When it’s time to extend, the doors swing open to clear the path for the gear to move into place. Once the gear is down and locked, the doors close again to enclose the gear inside the wheel well, further reducing drag and protecting the mechanism. They aren’t used to add lift, and they don’t only open during retraction—their opening during extension and closing afterward are both part of how they manage aerodynamics and gear protection.