A320
Flight Crew Last 90 Days 100; Flight Crew Total 13000; Flight Crew Type 7000
Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem; General Declared Emergency
Aircraft
About 2-2.5 hours into the flight we lost FMGC 1. After contacting Maintenance Control and Dispatch we followed the Flight Manual procedure and reset the FMGC 1 Circuit Breaker (CB). The reset was unsuccessful. [We] continued on to destination reviewing weather and approach capabilities. Just prior to top of descent; [we] lost FMGC 2. [We] declared an emergency and evaluated airport options and remaining fuel. Notified dispatch and the Captain flew while I handled the situation. With the QRH guidance I choose to reset FMGC 2 CB since FMGC 1 reset was unsuccessful. [We] were able to regain NAV on my side only. Reloaded the MCDU and prepared for the approach. On arrival I became the flying pilot with radar vectors to the ILS and landed uneventfully.
Loss FMCG 1 about 2 hours from takeoff then lost FMCG 2 just prior to descent. Declared an emergency; went through QRH. Contacted Dispatch for good weather to destination. Then First Officer got FMCG 2 back by recycling CB; and we continued. Since we only got back the First Officer's side; he flew and I did all non flying duties. Got vectors for ILS; landed uneventfully.
A320 flight crew experiences FMGC 1 failure in cruise and is unable to reset. FMGC 2 fails at top of descent and is successfully reset. The First Officer becomes the flying pilot and a normal approach and landing ensues.