<< >> NASA ASRS Report 790102, June 2008

A320 flight crew reports dual FMGC failure passing FL180 on climb out and elects to return to ZZZ when function cannot be regained.

Attributes
ACN	790102
Time
Date	200806
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 18000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 180 flight time total : 9000 flight time type : 500
ASRS Report	790102
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 90 flight time total : 18000 flight time type : 2000
ASRS Report	790103
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : landed as precaution
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On normal VMC climb out from ZZZ we lost both map displays. I was PF; captain told me that both FMGC's had locked up. This was followed by cabin pressure ECAM. We completed ECAM for manual set of cabin pressurization. We were unable to get FMGC's to respond so we; upon agreement; notified ZOA that we needed vectors and would like to return to ZZZ. We made an uneventful landing after manually tuning ILS and setting speeds. Supplemental information from acn 790103: approximately FL180 in climb out of ZZZ; received following indications: map not available on both sides; please wait on both FMGC's; cabin pressure ECAM indicating manual climb altitude setting necessary; autoplt disengaged. Both FMGC's failed. We notified ATC of need to return to ZZZ and we were negative RNAV capable. Manually tuned ILS frequencys and received radar vectors to ZZZ followed by the visual. Manually set reference speed based upon fuel weight; zero fuel weight and referencing the aircraft manual landing section.

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Original NASA ASRS Text

Title: A320 FLT CREW REPORTS DUAL FMGC FAILURE PASSING FL180 ON CLIMB OUT AND ELECTS TO RETURN TO ZZZ WHEN FUNCTION CANNOT BE REGAINED.

Narrative: ON NORMAL VMC CLBOUT FROM ZZZ WE LOST BOTH MAP DISPLAYS. I WAS PF; CAPT TOLD ME THAT BOTH FMGC'S HAD LOCKED UP. THIS WAS FOLLOWED BY CABIN PRESSURE ECAM. WE COMPLETED ECAM FOR MANUAL SET OF CABIN PRESSURIZATION. WE WERE UNABLE TO GET FMGC'S TO RESPOND SO WE; UPON AGREEMENT; NOTIFIED ZOA THAT WE NEEDED VECTORS AND WOULD LIKE TO RETURN TO ZZZ. WE MADE AN UNEVENTFUL LNDG AFTER MANUALLY TUNING ILS AND SETTING SPDS. SUPPLEMENTAL INFO FROM ACN 790103: APPROX FL180 IN CLBOUT OF ZZZ; RECEIVED FOLLOWING INDICATIONS: MAP NOT AVAILABLE ON BOTH SIDES; PLEASE WAIT ON BOTH FMGC'S; CABIN PRESSURE ECAM INDICATING MANUAL CLB ALT SETTING NECESSARY; AUTOPLT DISENGAGED. BOTH FMGC'S FAILED. WE NOTIFIED ATC OF NEED TO RETURN TO ZZZ AND WE WERE NEGATIVE RNAV CAPABLE. MANUALLY TUNED ILS FREQS AND RECEIVED RADAR VECTORS TO ZZZ FOLLOWED BY THE VISUAL. MANUALLY SET REF SPD BASED UPON FUEL WT; ZERO FUEL WT AND REFING THE ACFT MANUAL LNDG SECTION.

Data retrieved from NASA's ASRS site as of May 2009 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.