nits in the center pedestal in accordance with Atlantic Aviation/Delta Engineering STC ST00717NY-D, dated May 19, 1998, replacing the GAC installed Gables Comm/Nav/ATC/ADF / TCAS Control Heads. Newly installed equipment includes: 2 Ea. Collins RTU-4210 Radio Tune Units, P/N 822-0836-005 Removed equipment includes: 2