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A B767-300 first officer reported a course deviation on an overwater flight when their non-GPS aircraft apparently experienced a map shift.
| Attributes | |
| ACN | 891439 |
| Time | |
| Date | 201005 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZHU.ARTCC |
| State Reference | TX |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Navigational Equipment and Processing |
| Person 1 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Upon initial radar contact with center; we were informed by the controller that our position was 5-6 miles east of course. Our navigation data did not concur and showed us on course; in LNAV with autopilot on and cross-track error 0.0. Upon receiving VOR stations; our navigation system updated and performed a map shift where the aircraft began a left turn to try to stay on the magenta line now in motion to the west. We could only suspect an equipment malfunction and a log entry to maintenance was made. To the best of my knowledge there were no errors on the part of the flight crew; therefore more information regarding the equipment malfunction would be required to make a suggested resolution.
Original NASA ASRS Text
Title: A B767-300 First Officer reported a course deviation on an overwater flight when their non-GPS aircraft apparently experienced a map shift.
Narrative: Upon initial radar contact with Center; we were informed by the controller that our position was 5-6 miles east of course. Our navigation data did not concur and showed us on course; in LNAV with autopilot on and cross-track error 0.0. Upon receiving VOR stations; our navigation system updated and performed a map shift where the aircraft began a left turn to try to stay on the magenta line now in motion to the west. We could only suspect an equipment malfunction and a log entry to maintenance was made. To the best of my knowledge there were no errors on the part of the flight crew; therefore more information regarding the equipment malfunction would be required to make a suggested resolution.
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.