Flight management computer data base identification or date error caused confusion.

Attributes
ACN	505640
Time
Date	200103
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : rdv.airport
State Reference	NC
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Flight Phase	ground : parked ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 120 flight time total : 5000 flight time type : 2500
ASRS Report	505640
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Resolutory Action	flight crew : overcame equipment problem
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance Company
Primary Problem	Company

Narrative:

Maintenance data indicated the FMC navigation data base may have been out of date. The captain and I believe we had ascertained that the data base was up to date. We proceeded with the mission. We diligently double checked all navigation data with VOR/DME raw data and completed the sequence uneventfully. Human factor involved: confusion between the navigation data base number and the effective date listed.

Original NASA ASRS Text

Title: FLT MANAGEMENT COMPUTER DATA BASE IDENTIFICATION OR DATE ERROR CAUSED CONFUSION.

Narrative: MAINT DATA INDICATED THE FMC NAV DATA BASE MAY HAVE BEEN OUT OF DATE. THE CAPT AND I BELIEVE WE HAD ASCERTAINED THAT THE DATA BASE WAS UP TO DATE. WE PROCEEDED WITH THE MISSION. WE DILIGENTLY DOUBLE CHKED ALL NAV DATA WITH VOR/DME RAW DATA AND COMPLETED THE SEQUENCE UNEVENTFULLY. HUMAN FACTOR INVOLVED: CONFUSION BETWEEN THE NAV DATA BASE NUMBER AND THE EFFECTIVE DATE LISTED.

Data retrieved from NASA's ASRS site as of July 2007 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.