Abstract: A door release mechanism includes a drop wheel coupled to a holding brake sprocket; a brake drive sprocket fixed to a drop wheel coupled with a governor; and a drop arm having a tooth to mesh with the drop wheel. The drop arm has an engaged position and a disengaged position. In the engaged position, the drop arm prevents rotation of the brake drive sprocket; in the disengaged position, the drop arm allows rotation of the brake drive sprocket. The door release mechanism includes a second brake having a brake sprocket rotationally coupled to the brake drive sprocket. The second brake is configured to provide resistance to rotation of the brake sprocket in response to rotation of the brake sprocket exceeding a predetermined braking speed.