A320 flight crew experiences FMGC 1 failure in cruise and is unable to reset. FMGC 2 fails at top of...

Attributes
ACN	1149122
Time
Date	201402
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Descent
Component
Aircraft Component	FMS/FMC
Person 1
Function	Pilot Not Flying First Officer
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 13000 Flight Crew Type 7000
Person 2
Function	Pilot Flying Captain
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 30000
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

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 (circuit breaker). 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 circuit breaker since FMGC 1 reset was unsuccessful. [We] were able to regain navigation 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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

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.