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B737NG flight crew reported encountering wake turbulence at FL340 on arrival into lax that resulted in 30-40 degree bank left and right and a 500 feet loss of altitude.
| Attributes | |
| ACN | 1684040 |
| Time | |
| Date | 201909 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZLA.ARTCC |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 124.18 Flight Crew Type 3160.02 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 206.17 Flight Crew Type 1977.68 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Speed All Types Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
We were at FL340 on the ANJLL4 arrival to lax. Approaching shtnr we encountered wake turbulence from a preceding aircraft. The aircraft rolled approximately 30 degrees to the left. About 5 seconds later; we were rolled approximately 40 degrees to the right. Aircraft ap disengaged. We recovered and turned 20 degrees right to avoid additional turbulence. We lost approximately 500 feet of altitude. La center then cleared us to offset 3 nm and to descend to FL320. We were assigned .76 mach at the time of event. Later we were told to descend via anjll 4 except maintain 260 on the arrival. Later ATC asked what our airspeed was; we were doing .76 until the descent. We now think ATC wanted us to slow earlier and then descend at 260 kts.
Original NASA ASRS Text
Title: B737NG flight crew reported encountering wake turbulence at FL340 on arrival into LAX that resulted in 30-40 degree bank left and right and a 500 feet loss of altitude.
Narrative: We were at FL340 on the ANJLL4 arrival to LAX. Approaching SHTNR we encountered wake turbulence from a preceding aircraft. The aircraft rolled approximately 30 degrees to the left. About 5 seconds later; we were rolled approximately 40 degrees to the right. Aircraft AP disengaged. We recovered and turned 20 degrees right to avoid additional turbulence. We lost approximately 500 feet of altitude. LA Center then cleared us to offset 3 nm and to descend to FL320. We were assigned .76 Mach at the time of event. Later we were told to descend via ANJLL 4 except maintain 260 on the arrival. Later ATC asked what our airspeed was; we were doing .76 until the descent. We now think ATC wanted us to slow earlier and then descend at 260 Kts.
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.