Ω type composites stiffened panel has been widely used in large civil aircraft due to its structural advantage. But some difficulties exist in how to pressurize these Ω type stiffened panels during the co-curing process. Especially there are strict airworthiness compliance review requirements in the field of civil aviation products manufacturing

thereby further increasing the manufacturing difficulty. After a number of tests

the group decided to adopt thin-walled rubber balloon forming method to manufacture the Ω type stiffened panel in order to meet design requirements and airworthiness requirements finally.