Both A320 new series fmgcs blanked and both nd's showed map unavailable as the first officer was seq...

Narrative:

While setting up for an approach to 16C at sea; passing thru about 5;000 ft; the captain asked me to sequence the box. There were about 3-4 points to delete. While I was deleting the points the mcdu froze up and would not allow any input. Seconds later we lost all data in the mcdu; lost both map displays; lost ILS signal. We still showed 1fd2 on the pfd so I guess the FMGC's were working. We both tried to do a lateral revision from a fix to get the 'new destination' prompt but the box would not accept this. We figured out how to manually enter the ILS frequency with the standby nav technique (this is something we never do and stumbled to remember how to do it). This all happened within minutes of landing at a very inconvenient time. We broke out of the clouds and could make a visual approach thankfully. The box was trying to reinitialize itself but we landed before it fixed itself. We wanted to make a record of this incase there was a trend with the new box. Once again; it all happened when we were sequencing the box for final intercept.

Original NASA ASRS Text

Title: Both A320 new series FMGCs blanked and both ND's showed MAP UNAVAILABLE as the First Officer was sequencing waypoints on final approach to SEA. The ILS was manually turned to complete the approach.

Narrative: While setting up for an approach to 16C at SEA; passing thru about 5;000 FT; the Captain asked me to sequence the box. There were about 3-4 points to delete. While I was deleting the points the MCDU froze up and would not allow any input. Seconds later we lost all data in the MCDU; lost both map displays; lost ILS signal. We still showed 1FD2 on the PFD so I guess the FMGC's were working. We both tried to do a lateral revision from a fix to get the 'New Destination' prompt but the box would not accept this. We figured out how to manually enter the ILS frequency with the standby nav technique (this is something we never do and stumbled to remember how to do it). This all happened within minutes of landing at a very inconvenient time. We broke out of the clouds and could make a visual approach thankfully. The box was trying to reinitialize itself but we landed before it fixed itself. We wanted to make a record of this incase there was a trend with the new box. Once again; it all happened when we were sequencing the box for final intercept.

Data retrieved from NASA's ASRS site as of April 2012 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	957494
Time
Date	201106
Local Time Of Day	0601-1200
Place
Locale Reference	SEA.Airport
State Reference	WA
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Pilot Not Flying First Officer
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Both A320 new series fmgcs blanked and both nd's showed map unavailable as the first officer was sequencing waypoints on final approach to sea. The ILS was manually turned to complete the approach.