roved Rotorcraft Flight Manual Supplement Installation of dual TDR-94D ATC/MODE-S/ADS-B Transponders Sikorsky S-76C SECTION I SYSTEM DESCRIPTION S_PZ-7600 DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEM (DAFCS1 AIR DATA Air Data Computer Two P&G air data computers, as part of the SPZ-7600 system, are instal