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An air carrier aircraft's inertial reference units (irus) were reported off by 5 miles after an atlantic crossing.
| Attributes | |
| ACN | 841617 |
| Time | |
| Date | 200906 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZZ.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | INS / IRS / IRU |
| Person 1 | |
| Function | Relief Pilot |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Flight Engineer |
| Experience | Flight Crew Last 90 Days 220 Flight Crew Total 10500 Flight Crew Type 4500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
Taxi out. Extensive delay. Aircraft/IRU position shown to drift so pilots performed alignment and operations normal. After departure captain and first officer performed a navigation accuracy check and were successful and within limits. Upon track exit at point: shannon control advised that aircraft was approximately 5 miles north of point. Indicated on course. No conflict involved. Upon flight termination; irus indicated excessive drift.
Original NASA ASRS Text
Title: An air carrier aircraft's inertial reference units (IRUs) were reported off by 5 miles after an Atlantic crossing.
Narrative: Taxi out. Extensive delay. Aircraft/IRU position shown to drift so pilots performed alignment and operations normal. After departure Captain and First Officer performed a navigation accuracy check and were successful and within limits. Upon track exit at point: Shannon Control advised that aircraft was approximately 5 miles north of point. Indicated on course. No conflict involved. Upon flight termination; IRUs indicated excessive drift.
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.