hat transponder was already existing. Table 3 Equipment by Aircraft Aircraft Transponder Installed/Retained/Replaced GPS Installed/Replaced , Antenna Installed • I Learjet 60 TDR-94s or 94Ds GPS-1203C or GPS- 40005 CI 429-200 Gulfstream Aerospace 1125 Westwind Astra, Astra SPX, Gulfstream