Both fmgcs on an A320 failed in flight and would not completely reset so the flight descended out of...

Narrative:

While cruising at FL360; [we had the] number 1 FMGC failed. Approximately 15 minutes later; the number 2 FMGC failed while we were running through the QRH in accordance with maintenance's directions. Number 1 FMGC failed to reset after performing the circuit breaker reset procedures and it made the no FMGC condition worst while following the QRH. Number 2 was still having navigation engaged and number 2 autopilot still engaged. We advised maintenance and elected not to continue with the reset till we are closer to our destination airport for fear of losing number 2 system completely with no auto flight capabilities. (We did reset number 2 FMGC as we were less than a 100 NM from our filed destination in accordance with the QRH and number 2 failed to reset also.) [we] notified ATC of unable rvsm as well as unable RNAV. [We] descended to FL280 per ATC instructions. [We] reverted to standby navigation remainder of the flight. [We] advised dispatch of our problems. Uneventful approach and landing runway 25L.

Original NASA ASRS Text

Title: Both FMGCs on an A320 failed in flight and would not completely reset so the flight descended out of RVSM and continued to their destination in Standby NAV.

Narrative: While cruising at FL360; [we had the] Number 1 FMGC failed. Approximately 15 minutes later; the Number 2 FMGC failed while we were running through the QRH in accordance with Maintenance's directions. Number 1 FMGC failed to reset after performing the Circuit Breaker reset procedures and it made the no FMGC condition worst while following the QRH. Number 2 was still having NAV engaged and Number 2 autopilot still engaged. We advised Maintenance and elected not to continue with the reset till we are closer to our destination airport for fear of losing Number 2 System completely with no Auto Flight capabilities. (We did reset Number 2 FMGC as we were less than a 100 NM from our filed destination in accordance with the QRH and Number 2 failed to reset also.) [We] notified ATC of Unable RVSM as well as Unable RNAV. [We] descended to FL280 per ATC instructions. [We] reverted to Standby NAV remainder of the flight. [We] advised Dispatch of our problems. Uneventful approach and landing Runway 25L.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1123959
Time
Date	201310
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Captain Pilot Not Flying
Experience	Flight Crew Last 90 Days 125 Flight Crew Total 21800 Flight Crew Type 4200
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Both fmgcs on an A320 failed in flight and would not completely reset so the flight descended out of rvsm and continued to their destination in standby navigation.