A transponder testing apparatus is integrated into the transponder and verifies that the transponders are operating in {HEAD ~ accordance} to {TAIL ~ Federal Aviation Regulations} 
to
A transponder testing apparatus is integrated into the transponder and verifies that the transponders are operating in { HEAD ~ accordance } to { TAIL ~ Federal Aviation Regulations }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL