CE650 FLT CREW ENCOUNTERS B777 WAKE TURB ON APCH TO LAX.

2006-06 · NASA ASRS report 700509

Date: 2006-06 · Aircraft: Citation III; VI; VII (C650) · Phase: approach

Anomalies: inflight-event-encounter-loss-of-aircraft-control|inflight-event-encounter-weather-turbulence

Synopsis

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.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

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