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Boeing 787 captain reported difficulty in meeting crossing restrictions on arrival due to the aircraft's increased glide ratio.
| Attributes | |
| ACN | 1495214 |
| Time | |
| Date | 201711 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | PCT.TRACON |
| State Reference | VA |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B787 Dreamliner Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR GIBBZ |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Total 17085 Flight Crew Type 0 |
| Events | |
| Anomaly | Flight Deck / Cabin / Aircraft Event Other / Unknown |
Narrative:
I'm getting checked out on the 787. We were flying the gibbz 2 RNAV arrival hvq transition into iad. While flying the arrival between ottto and rypin; the aircraft (787) required full speed brake extension to make the crossing restriction at maaay which we just made. This [report] is being sent to highlight the fact that the 787 has a high probability of missing the crossing restraints on the gibbz 2 arrival if the tailwind is stronger or if the plane is slower (closer to max lift over drag speed). For planning purposes the 787 flies closer to a 4 to 1 ratio verses 3 to 1 on other aircraft. Distance from ottto to maaay is 7.1 miles in which the plane has to descend 2000 ft. Additional distance is also required for the auto flight system to transition from level flight into the descent phase and back. I strongly suggest changing the distance between the points or the amount of altitude between these points.
Original NASA ASRS Text
Title: Boeing 787 Captain reported difficulty in meeting crossing restrictions on arrival due to the aircraft's increased glide ratio.
Narrative: I'm getting checked out on the 787. We were flying the GIBBZ 2 RNAV arrival HVQ transition into IAD. While flying the arrival between OTTTO and RYPIN; the aircraft (787) required full speed brake extension to make the crossing restriction at MAAAY which we just made. This [report] is being sent to highlight the fact that the 787 has a high probability of missing the crossing restraints on the GIBBZ 2 arrival if the tailwind is stronger or if the plane is slower (closer to max lift over drag speed). For planning purposes the 787 flies closer to a 4 to 1 ratio verses 3 to 1 on other aircraft. Distance from OTTTO to MAAAY is 7.1 miles in which the plane has to descend 2000 ft. Additional distance is also required for the auto flight system to transition from level flight into the descent phase and back. I strongly suggest changing the distance between the points or the amount of altitude between these points.
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.