{HEAD ~ longitudinally oriented non metallic stringers} having a lower flange joined to the skins and an upper flange joined to {TAIL ~ an upper part} of the frame members 
{ HEAD ~ longitudinally oriented non metallic stringers } having a lower flange joined to the skins and an upper flange joined to { TAIL ~ an upper part } of the frame members
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH