The invention relates to {HEAD ~ large surface area structural components} such as an aircraft doors, aircraft body sections having an outer skin reinforced by {TAIL ~ stiffening elements} 
The invention relates to { HEAD ~ large surface area structural components } such as an aircraft doors , aircraft body sections having an outer skin reinforced by { TAIL ~ stiffening elements }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL