<< >> NASA ASRS Report 867297, December 2009

A B737-800 encountered wake turbulence five miles in trail of a heavy four engine jet on approach to lax runway 25L.

Attributes
ACN	867297
Time
Date	200912
Local Time Of Day	0601-1200
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Person 2
Function	First Officer Pilot Flying
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

Cleared for the visual approach to runway 25L at lax. At about 2500 ft AGL with autopilot engaged we were 5 miles in trail of a heavy B747-400 aircraft when we encountered wake turbulence. The airplane rolled to the left resulting in one bank angle alert. The captain (pilot flying) disconnected the autopilot and performed the upset recovery procedure. With the bank angle normal I notified approach control of the wake turbulence encounter and were cleared to continue the approach left of the localizer as needed. Switched to tower and landed without further incident.

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Original NASA ASRS Text

Title: A B737-800 encountered wake turbulence five miles in trail of a heavy four engine jet on approach to LAX Runway 25L.

Narrative: Cleared for the visual approach to Runway 25L at LAX. At about 2500 FT AGL with autopilot engaged we were 5 miles in trail of a heavy B747-400 aircraft when we encountered wake turbulence. The airplane rolled to the left resulting in one bank angle alert. The Captain (pilot flying) disconnected the autopilot and performed the upset recovery procedure. With the bank angle normal I notified Approach Control of the wake turbulence encounter and were cleared to continue the approach left of the localizer as needed. Switched to Tower and landed without further incident.

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.