ual Collins DME -40 DIE system. . . _. ' . . .. - . s. Dual Collins TDR -90 transponder system . . • ' l i, c Dual Collins DF-206 kW system Collins FPC -75 ground proximity warning Systel‘we -.. . ... ...-...„„, ..- . Collins 54W1C comparator warning system . . . • Collins 512-4 marker beacon s