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