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A B777 flight crew reports entering the holding course instead of the holding radial as cleared by ATC; for a holding pattern at bnn. The captain detects the error prior to bnn and corrects it but the FMC does not initially update and the pattern is entered in the wrong quadrant. As ATC issues vectors; the pattern on the map display flips to the correct quadrant.
| Attributes | |
| ACN | 1255492 |
| Time | |
| Date | 201504 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | EGTT.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | First Officer Relief Pilot |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
After entering holding at bnn; ATC queried our heading and gave vectors to reenter the holding pattern. During the turn we confirmed the CDU holding inputs were correct. We then noticed the holding pattern on the navigation display (nd) was drawn to the opposite quadrant. While being vectored; all pilots saw the depicted track on the nd redraw itself to the proper direction.apparently the holding inputs were initially entered erroneously; long before bnn; then corrected shortly before reaching bnn. The flight director followed the holding pattern displayed on the nd after passing bnn. The flight director updated to the correct data that was on the CDU maybe 90 seconds after passing bnn. CDU changes close to fixes must be scrutinized. There seems to be some flight computer-to display lag that needs to be accounted for.
Original NASA ASRS Text
Title: A B777 flight crew reports entering the holding course instead of the holding Radial as cleared by ATC; for a holding pattern at BNN. The Captain detects the error prior to BNN and corrects it but the FMC does not initially update and the pattern is entered in the wrong quadrant. As ATC issues vectors; the pattern on the map display flips to the correct quadrant.
Narrative: After entering holding at BNN; ATC queried our heading and gave vectors to reenter the holding pattern. During the turn we confirmed the CDU holding inputs were correct. We then noticed the holding pattern on the Navigation Display (ND) was drawn to the opposite quadrant. While being vectored; all pilots saw the depicted track on the ND redraw itself to the proper direction.Apparently the holding inputs were initially entered erroneously; long before BNN; then corrected shortly before reaching BNN. The flight director followed the holding pattern displayed on the ND after passing BNN. The flight director updated to the correct data that was on the CDU maybe 90 seconds after passing BNN. CDU changes close to fixes must be scrutinized. There seems to be some flight computer-to display lag that needs to be accounted for.
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.