Gulfstream IV / G350 / G450
Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 75; Flight Crew Total 5000; Flight Crew Type 1100
Workload; Distraction; Troubleshooting
Aircraft Equipment Problem Critical
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Landed in Emergency Condition
Aircraft
During cruise flight at FL450 about one hour prior to decent we experienced a DADC (Digital Air Data Computer) fault. A DADC Miscompare CAS Message was displayed and the appropriate AFM Quick Reference Handbook procedure was accomplished. We continued the flight with both Captain and First Officer operating with a single DADC. As we commenced our decent into ZZZZ; the Air Data information displayed by the remaining DADC did not agree with the Standby Flight Instruments; all automation was disengaged and the remainder of the flight was conducted by reference to the Standby Flight Instruments. We [advised ATC] and continued to land on Runway XX.
[Report narrative contained no additional information.]
G-IV flight crew reported an air data computer failure and the arrival flown using standby instruments.