A regional airline flight crew reported encountering the wake from a B757 on final approach at lax. ...

Narrative:

I was the pilot flying to lax. We were following a B-757 from the north arrival and encountered wake turbulence on numerous occasions. We altered our descent to avoid it and stayed above the flight path of the 757. We were vectored to follow the 757 for an ILS to runway 24 right and complied with all airspeed and altitude instructions. We were cleared down to 2;500 ft and told to turn right and intercept the localizer. The B-757 was about 4 miles ahead of us for the same runway and about 1;000 ft higher than us. We were slowed to 180 KTS and began to encounter wake from the B-757. We were VMC and had a visual on the plane. The only way to escape the wake was to turn right and parallel the localizer. They were conducting simultaneous ILS approaches and the weather was VMC ahead of us. We were about one-half deflection on the localizer needle in the heading mode. ATC advised us that we could not parallel the course and to return to the localizer. I turned the aircraft towards the localizer but before we could get there he told us to turn right and vectored us back around for another approach. Upon landing we were told to copy ATC phone number.

Original NASA ASRS Text

Title: A regional airline Flight Crew reported encountering the wake from a B757 on final approach at LAX. They chose to avoid the wake by flying an offset; but when ATC noticed they were sent around.

Narrative: I was the pilot flying to LAX. We were following a B-757 from the North arrival and encountered wake turbulence on numerous occasions. We altered our descent to avoid it and stayed above the flight path of the 757. We were vectored to follow the 757 for an ILS to Runway 24 Right and complied with all airspeed and altitude instructions. We were cleared down to 2;500 FT and told to turn right and intercept the localizer. The B-757 was about 4 miles ahead of us for the same runway and about 1;000 FT higher than us. We were slowed to 180 KTS and began to encounter wake from the B-757. We were VMC and had a visual on the plane. The only way to escape the wake was to turn right and parallel the localizer. They were conducting simultaneous ILS approaches and the weather was VMC ahead of us. We were about one-half deflection on the localizer needle in the heading mode. ATC advised us that we could not parallel the course and to return to the localizer. I turned the aircraft towards the localizer but before we could get there he told us to turn right and vectored us back around for another approach. Upon landing we were told to copy ATC phone number.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	896594
Time
Date	201007
Local Time Of Day	1201-1800
Place
Locale Reference	SCT.TRACON
State Reference	CA
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types Inflight Event / Encounter Wake Vortex Encounter

A regional airline flight crew reported encountering the wake from a B757 on final approach at lax. They chose to avoid the wake by flying an offset; but when ATC noticed they were sent around.