Citation X (C750)
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Procedure; Aircraft
We had a dual IRS failure immediately after takeoff. The nav database was updated that morning. We got no indications in the cockpit until the dual failure. The system logged 3 pages of faults and codes; starting when we left [departure airport]; but we got no EICAS messages in the cockpit. We navigated visually to [destination]. Navigation was reduced to only the standby magnetic compass and dead reckoning on the short flight. All navigation ability was lost. I have many reasons to suspect that Maintenance loaded the wrong database that morning. A different database was loaded at [destination] and their narrative was that no failures were noted; even after simulated flight parameters were entered. Luckily we were VMC on the short flight and we were able to complete the flight without further incident. No emergency was declared because it was roughly a 20 mile flight; and VMC prevailed.I would like to know why a Citation X lost all navigational ability in flight. Obviously this was a very serious issue and could have been exponentially worse in IMC conditions. How can a dual IRS aircraft; with a split bus electrical system fail at the same time? I believe the wrong database information was entered that morning. A detailed follow up is needed for this potentially serious condition.
Citation X Captain reported loss of all nav capability except standby compass shortly after takeoff. Captain suspects anomaly was related to improper nav database software load.