Commercial Fixed Wing
Maintenance Repairman; Maintenance Inspection Authority; Maintenance Avionics; Other Engineer
Maintenance Avionics 20
Troubleshooting
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Flight Crew Inflight Shutdown; Flight Crew Requested ATC Assistance / Clarification
Aircraft
On (Date); the Company Service Center in ZZZ received a report that the Fault Tolerant ADIRU had a navigation performance system failure that the pilot reported resulting in the crew and aircraft becoming lost during a recent flight. The component was returned to the United States. The US personnel reviewing the failure indicated that the failure was due to an undetected failure of a ring laser gyro resulting in drift that went undetected by the FTADIRU. This is concerning as another Aircraft X went missing having the same navigation system. A Aircraft X type; full of passengers should not 'get lost' due to a navigation system failure; but the engineers confirmed this was certainly possible upon analyzing the failure in detail.
Flight Crew reported that an ADIRU failure caused the crew and aircraft to become lost.