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