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CE650 flight crew encounters B777 wake turbulence on approach to lax.
| Attributes | |
| ACN | 700509 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lax.airport |
| State Reference | CA |
| Altitude | msl single value : 3500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sct.tracon |
| Operator | common carrier : charter |
| Make Model Name | Citation III VI VII |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | ils localizer & glide slope : 25l |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : sct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : charter |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 90 flight time total : 3400 flight time type : 400 |
| ASRS Report | 700509 |
| Person 2 | |
| Affiliation | company : charter |
| Function | flight crew : first officer |
| Events | |
| Anomaly | inflight encounter : weather other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
We were given a heading and told to maintain 3500 ft and we were cleared for the approach to the runway 25L ILS. We were also told that we were following a B777 and given a wake turbulence warning. I intercepted the localizer and was approaching the GS when we encountered some minor turbulence. After a few minor bumps we encountered the wake of the B777. The aircraft was banked sharply to the right; approximately 90 degrees; I countered the bank with opposite aileron. After a few seconds I regained control of the aircraft and recovered from the uncommanded bank. After the encounter we were still established on the localizer; however; we were 1 1/2 dots right of center. I referenced the GS to check for altitude changes; and found we were approximately 1 DOT above the GS. I then re-intercepted the localizer then flew the remainder of the approach 1 DOT above the GS and landed normally. We were given a clearance to intercept the ILS below the flight path of the preceding B777 which brought us into its wake. In the future I may deviate slightly to the left or right (after considering terrain and parallel traffic; etc) until I am above the GS and able to descend to the runway 1 DOT above. There were no adverse effects to the aircraft or passenger as a result of this encounter. I will research and refresh my knowledge of wake turbulence and avoidance procedures.
Original NASA ASRS Text
Title: CE650 FLT CREW ENCOUNTERS B777 WAKE TURB ON APCH TO LAX.
Narrative: WE WERE GIVEN A HDG AND TOLD TO MAINTAIN 3500 FT AND WE WERE CLRED FOR THE APCH TO THE RWY 25L ILS. WE WERE ALSO TOLD THAT WE WERE FOLLOWING A B777 AND GIVEN A WAKE TURB WARNING. I INTERCEPTED THE LOC AND WAS APCHING THE GS WHEN WE ENCOUNTERED SOME MINOR TURB. AFTER A FEW MINOR BUMPS WE ENCOUNTERED THE WAKE OF THE B777. THE ACFT WAS BANKED SHARPLY TO THE R; APPROX 90 DEGS; I COUNTERED THE BANK WITH OPPOSITE AILERON. AFTER A FEW SECONDS I REGAINED CTL OF THE ACFT AND RECOVERED FROM THE UNCOMMANDED BANK. AFTER THE ENCOUNTER WE WERE STILL ESTABLISHED ON THE LOC; HOWEVER; WE WERE 1 1/2 DOTS R OF CTR. I REFED THE GS TO CHK FOR ALT CHANGES; AND FOUND WE WERE APPROX 1 DOT ABOVE THE GS. I THEN RE-INTERCEPTED THE LOC THEN FLEW THE REMAINDER OF THE APCH 1 DOT ABOVE THE GS AND LANDED NORMALLY. WE WERE GIVEN A CLRNC TO INTERCEPT THE ILS BELOW THE FLT PATH OF THE PRECEDING B777 WHICH BROUGHT US INTO ITS WAKE. IN THE FUTURE I MAY DEVIATE SLIGHTLY TO THE L OR R (AFTER CONSIDERING TERRAIN AND PARALLEL TFC; ETC) UNTIL I AM ABOVE THE GS AND ABLE TO DSND TO THE RWY 1 DOT ABOVE. THERE WERE NO ADVERSE EFFECTS TO THE ACFT OR PAX AS A RESULT OF THIS ENCOUNTER. I WILL RESEARCH AND REFRESH MY KNOWLEDGE OF WAKE TURB AND AVOIDANCE PROCS.
Data retrieved from NASA's ASRS site as of January 2009 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.