Regional Jet 900 (CRJ900)
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface
Aircraft Equipment Problem Critical; Inflight Event / Encounter Loss Of Aircraft Control
Flight Crew Exited Penetrated Airspace; Flight Crew Regained Aircraft Control; Flight Crew FLC Overrode Automation; General Declared Emergency; General Maintenance Action
Aircraft
While enroute and climbing to FL330 the First Officer (pilot flying) reported a PIT flag on his Attitude indicator. Flight information was quickly cross checked with my side and with the standby instruments which indicated discrepancies on the First Officer's flight information. All of his information was unreliable including attitude; heading; and altitude. At that time I assumed control of the aircraft and became the flying pilot. ATC was informed of the loss of the First Officer's instruments and the autopilot. The problem was also complicated with incorrect flight director information on both sides of the aircraft. The flight director was cancelled and I flew the aircraft in raw data. We requested lower to vacate RSVM altitudes. Approximately 10 minutes into hand flying the aircraft we received an uncommanded rudder deflection full left; which then returned back to normal trim on its own. The autopilot was still off. At this time we declared an emergency as a precaution and asked for a lower altitude. At this time we had approximately 25 remaining to our destination. A second uncommanded rudder deflection occurred on descent 15 minutes after the initial one. It was less pronounced and was to the right. All checklist and company procedures were followed as outlined in the flight manual and the QRH. The company was notified via ACARS. The flight attendants were [briefed regarding the anomalies. The flight was completed without further incident. Maintenance and dispatch were contacted via telephone upon arrival at the gate. Two maintenance write-ups were completed at the gate. [I suspect they may need to] replace the IRS.
Following the loss of the First Officer's flight instruments and the autoflight systems the flight crew of a CRJ-900 later experienced uncommanded full or near full rudder deflections to both the left and right. They descended and landed without further incident at their destination.