Aircraft equipment problem. Error in IRU's. Radar controller alerted flight crew to the off course. When aircraft was receiving vors it displayed 'verify position.'

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Attributes
ACN	338700
Time
Date	199606
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : eggx
State Reference	FO
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : atlantic enroute airway : eggx
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	338700
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	338598
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

ATC facility: shanwick ATC. Location: 5215N. Upon initial contact with shanwick, they advised that we were 14 NM south of track. All IRU's were close to each other, but the FMC position was about 13 mi from the average IRS position. When we received our first VOR update a verify message 'verify position' message on the FMC was displayed.

Original NASA ASRS Text

Title: ACFT EQUIP PROB. ERROR IN IRU'S. RADAR CTLR ALERTED FLC TO THE OFF COURSE. WHEN ACFT WAS RECEIVING VORS IT DISPLAYED 'VERIFY POS.'

Narrative: ATC FACILITY: SHANWICK ATC. LOCATION: 5215N. UPON INITIAL CONTACT WITH SHANWICK, THEY ADVISED THAT WE WERE 14 NM S OF TRACK. ALL IRU'S WERE CLOSE TO EACH OTHER, BUT THE FMC POS WAS ABOUT 13 MI FROM THE AVERAGE IRS POS. WHEN WE RECEIVED OUR FIRST VOR UPDATE A VERIFY MESSAGE 'VERIFY POS' MESSAGE ON THE FMC WAS DISPLAYED.

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.