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A B757 crossed the active waypoint; kurse; and instead of the FMC sequencing to the next waypoint; it began a right turn back to kurse which remained the active waypoint. The legs page skipped the next flight plan waypoint and a magenta track line was drawn to FOD. The HSI map had the correct track fixes but retained kurse; then onl and FOD.
| Attributes | |
| ACN | 1099966 |
| Time | |
| Date | 201307 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZDV.ARTCC |
| State Reference | CO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 250 Flight Crew Total 26500 Flight Crew Type 15000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
While cruising at FL370 the aircraft crossed the active waypoint; kurse; and then made a hard right turn back to it. The subsequent waypoint; onl; remained inactive on the HSI and disappeared from the FMC legs page; with the following waypoint; FOD; appearing at 1L. We used heading select and direct intercept to onl to get back on course. ATC was notified. The position report page showed crossing kurse nine minutes later than we actually did. Actual time xx:01; on position rep page it was xx:10. Anomaly appears similar to that indicated in the pegasus bulletin.
Original NASA ASRS Text
Title: A B757 crossed the active waypoint; KURSE; and instead of the FMC sequencing to the next waypoint; it began a right turn back to KURSE which remained the active waypoint. The LEGS page skipped the next flight plan waypoint and a magenta track line was drawn to FOD. The HSI Map had the correct track fixes but retained KURSE; then ONL and FOD.
Narrative: While cruising at FL370 the aircraft crossed the active waypoint; KURSE; and then made a hard right turn back to it. The subsequent waypoint; ONL; remained inactive on the HSI and disappeared from the FMC legs page; with the following waypoint; FOD; appearing at 1L. We used heading select and direct intercept to ONL to get back on course. ATC was notified. The POS REPORT page showed crossing KURSE nine minutes later than we actually did. Actual time XX:01; on POS REP page it was XX:10. Anomaly appears similar to that indicated in the Pegasus Bulletin.
Data retrieved from NASA's ASRS site as of July 2013 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.