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