longitudinally spaced apart metallic frame members spaced from the skins and defining {HEAD ~ a latitudinal section} of {TAIL ~ an aircraft fuselage section} 
of
longitudinally spaced apart metallic frame members spaced from the skins and defining { HEAD ~ a latitudinal section } of { TAIL ~ an aircraft fuselage section }
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 TAIL