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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.'
| 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.