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B787 flight crew reported flight plan course deviation by inadvertently activated secondary route in the FMS.
| Attributes | |
| ACN | 1612628 |
| Time | |
| Date | 201901 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B787 Dreamliner Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 204 Flight Crew Total 21263 Flight Crew Type 3022 |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Deviation - Procedural Clearance Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
Aircraft was approaching [coordinates] in continuous moderate turbulence. First officer began to plot new turbulence report utilizing rte 2 page. Shortly afterwards; captain became aware that the aircraft was showing significantly right of course from magenta line. A turn to the left was executed in order to rejoin the established course. Shortly after turn initiated; ZZZ [ATC] contacted flight with information that it was deviating left of course and issued clearance to deviate as necessary. Captain became concerned as to the accuracy of magenta course being displayed on moving map and a direct course to [coordinates] was then executed and a new position report sent. A careful examination of flight plan was made and compared to loaded route. Waypoints; distances and courses were carefully verified. Flight proceeded to [destination] normally. It would appear that that during the plotting of the turbulence that route 2 was inadvertently activated. How this happened is not known.
Original NASA ASRS Text
Title: B787 flight crew reported flight plan course deviation by inadvertently activated secondary route in the FMS.
Narrative: Aircraft was approaching [coordinates] in continuous moderate turbulence. First Officer began to plot new turbulence report utilizing Rte 2 page. Shortly afterwards; Captain became aware that the aircraft was showing significantly RIGHT of course from magenta line. A turn to the left was executed in order to rejoin the established course. Shortly after turn initiated; ZZZ [ATC] contacted flight with information that it was deviating LEFT of course and issued clearance to deviate as necessary. Captain became concerned as to the accuracy of magenta course being displayed on moving map and a direct course to [coordinates] was then executed and a new position report sent. A careful examination of flight plan was made and compared to loaded route. Waypoints; distances and courses were carefully verified. Flight proceeded to [destination] normally. It would appear that that during the plotting of the turbulence that Route 2 was inadvertently activated. How this happened is not known.
Data retrieved from NASA's ASRS site 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.