A bolt attachment is attached to {HEAD ~ the outer surface} of the fan case and has a composite boss with {TAIL ~ at least one threaded metallic insert} 
A bolt attachment is attached to { HEAD ~ the outer surface } of the fan case and has a composite boss with { TAIL ~ at least one threaded metallic insert }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL