What might cause a gear door to remain open after gear is lowered?

• A. The wheel is spinning too fast.
• B. Door interlock failure, limit switch misadjustment, or a mechanical jam preventing door closure.
• C. The gear is in perfectly retracted position.
• D. The anti-skid sensor is failed.

Answer: (B)

When the gear is lowered, the doors should move to the closed, latched position as part of the extension sequence. If a door stays open, it points to a problem in the door control system or the physical door path. A door interlock is a safety feature that ensures the doors don’t close if conditions aren’t right or if something is preventing proper closure. If that interlock fails, the system may think the door is still open and keep it from closing. A limit switch is used to sense the door’s position; if it’s misadjusted, the system may never register the door as closed and leave it open. A mechanical jam—something blocking the door or preventing it from moving along its track—will physically stop the door from reaching the closed position.

The other factors don’t fit as well. Wheel speed relates to tire and suspension behavior, not the door mechanism. The gear being in a perfectly retracted position describes the gear state, not why the door would remain open after lowering. An anti-skid sensor affects braking logic, not the door closure sequence, so it wouldn’t cause the doors to stay open.