What is a bogie in main landing gear?

• A. A hinged frame carrying multiple wheels to distribute loads and improve stability.
• B. A single wheel with a tire and hub.
• C. The protective cover over the wing landing gear.
• D. A fixed axle with two wheels on a rigid arm.

Answer: (D)

A bogie is the wheel assembly on the landing gear that carries multiple wheels on a single frame so the load is shared and stability is improved during landing and rollout. Describing it as a fixed axle with two wheels on a rigid arm captures that idea: two wheels mounted on a common axle bonded to a rigid support attached to the gear, so the load is distributed across both tires rather than through a single wheel. This shared-wheels-on-a-frame concept is the core function of a bogie. The other descriptions don’t match this idea: a single wheel lacks the multiple-wheel frame, a protective cover isn’t the wheel assembly, and a hinged frame with multiple wheels describes a somewhat different arrangement, whereas the fixed-axle two-wheel bogie aligns with the typical two-wheel bogie design used to distribute loads and enhance stability.