Aviation Dictionary
شکم دار کردن ، برجسته کردن سرلوله بوسیله ابزار مهره زدن
Make a rounded ridge formed near the end of a piece of rigid tubing used for carrying fluids in an aircraft. A hose is slipped over the end of the tube, and a hose clamp is installed between the end of the hose and the bead. The bead keeps the tube from being pulled out of the hose.