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B737 flight crew reported encountering wake turbulence from the preceding aircraft on the DSNEE1 arrival into sna that resulted in rolls to the left and right as well as a loss of 400 ft in altitude.
| Attributes | |
| ACN | 1470751 |
| Time | |
| Date | 201708 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | SNA.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR DSNEE1 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Flight Phase | Descent |
| Route In Use | STAR DSNEE1 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 5709 |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 2486 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
Approaching dsnee intersection; we encountered two significant wake events. Descending to the crossing altitude of 8000; with autopilot engaged; the aircraft banked sharply to the right. The autopilot went to cws (control wheel steering); and lateral guidance was lost. Regained control/composure with autopilot engaged; LNAV/VNAV level at 8000 when another wake encounter banked aircraft left greater than 35 degrees with significant buffeting. Turned autopilot off and lost about 400 ft in the process of recovery.
Original NASA ASRS Text
Title: B737 flight crew reported encountering wake turbulence from the preceding aircraft on the DSNEE1 Arrival into SNA that resulted in rolls to the left and right as well as a loss of 400 ft in altitude.
Narrative: Approaching DSNEE intersection; we encountered two significant wake events. Descending to the crossing altitude of 8000; with autopilot engaged; the aircraft banked sharply to the right. The autopilot went to CWS (Control Wheel Steering); and lateral guidance was lost. Regained control/composure with autopilot engaged; LNAV/VNAV level at 8000 when another wake encounter banked aircraft left greater than 35 degrees with significant buffeting. Turned autopilot off and lost about 400 ft in the process of recovery.
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.