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Captain reported the aircraft was unable to fly the jfrye STAR in VNAV to dal with a 70 knot tailwind.
| Attributes | |
| ACN | 1218188 |
| Time | |
| Date | 201411 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | DAL.Airport |
| State Reference | TX |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Medium Large Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR JFRYE |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 71 |
| Events | |
| Anomaly | Inflight Event / Encounter Weather / Turbulence |
Narrative:
No deviation occurred on this flight but the jfrye STAR was found not flyable with a 70-knot tailwind. During cruise the FMC generated two steep descent messages; one for zorda and the second was for gummp. After crossing zorda; the aircraft went into VNAV speed and was 400 feet on the path. The vertical path was recovered by using speedbrakes. Crossing gummp; the aircraft once again went into VNAV speed and was 800 feet high on the vertical path. We had to change autopilot modes after guump in an attempt to meet the altitude and speed restrictions at gregs. Full speedbrake extension could not maintain a speed of 280 knots in the descent and re-establish the aircraft back on the vertical path to gregs. Only using vertical speed; full speedbrake extension; and a speed of greater than 280 knots could we meet the altitude restriction at gregs. This STAR must be redesigned to meet aircraft capability with moderate to strong tailwind components.
Original NASA ASRS Text
Title: Captain reported the aircraft was unable to fly the JFRYE STAR in VNAV to DAL with a 70 knot tailwind.
Narrative: No deviation occurred on this flight but the JFRYE STAR was found not flyable with a 70-knot tailwind. During cruise the FMC generated two STEEP DESCENT messages; one for ZORDA and the second was for GUMMP. After crossing ZORDA; the aircraft went into VNAV SPD and was 400 feet on the path. The vertical path was recovered by using speedbrakes. Crossing GUMMP; the aircraft once again went into VNAV SPD and was 800 feet high on the vertical path. We had to change autopilot modes after GUUMP in an attempt to meet the altitude and speed restrictions at GREGS. Full speedbrake extension could not maintain a speed of 280 knots in the descent and re-establish the aircraft back on the vertical path to GREGS. Only using Vertical Speed; full speedbrake extension; and a speed of greater than 280 knots could we meet the altitude restriction at GREGS. This STAR must be redesigned to meet aircraft capability with moderate to strong tailwind components.
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.