 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737 flight crew reported track deviation on approach to lax when the autopilot reverted to control wheel steering in response to a wake turbulence encounter.
| Attributes | |
| ACN | 1238757 |
| Time | |
| Date | 201502 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | LAX.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 130 |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 195 |
| Events | |
| Anomaly | Deviation - Procedural Clearance Deviation - Track / Heading All Types Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
Approaching sadde intersection; descending from 12;000 feet to 10;000 feet and slowing to 210 knots; we encountered moderate plus wake turbulence from heavy 777 in calm air; causing autopilot to revert to cws from LNAV/VNAV cmd mode. After arresting control from wake rolling tendency; we overshot sadde intersection and had to manually turn towards bayst intersection before re-engaging LNAV/VNAV cmd mode. We were advised at the same time by ATC to turn immediately towards bayst. Just prior to autopilot disconnect; we had advised ATC of the wake turbulence upset. Remainder of flight was uneventful after we reported heavy aircraft in sight for visual approach and remained above its glidepath.
Original NASA ASRS Text
Title: B737 flight crew reported track deviation on approach to LAX when the autopilot reverted to control wheel steering in response to a wake turbulence encounter.
Narrative: Approaching SADDE intersection; descending from 12;000 feet to 10;000 feet and slowing to 210 knots; we encountered moderate plus wake turbulence from heavy 777 in calm air; causing autopilot to revert to CWS from LNAV/VNAV CMD mode. After arresting control from wake rolling tendency; we overshot SADDE intersection and had to manually turn towards BAYST intersection before re-engaging LNAV/VNAV CMD mode. We were advised at the same time by ATC to turn immediately towards BAYST. Just prior to autopilot disconnect; we had advised ATC of the wake turbulence upset. Remainder of flight was uneventful after we reported heavy aircraft in sight for visual approach and remained above its glidepath.
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.