Flight crew of air carrier A300 aircraft lost control of aircraft on ILS approach 5 mi behind and approximately 2000 ft above B757 aircraft due to wake turbulence.

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Attributes
ACN	273733
Time
Date	199406
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax tracon : bur
Operator	common carrier : air carrier
Make Model Name	A300
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 11000 flight time type : 3000
ASRS Report	273733
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 30000 vertical : 2000
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Wake turbulence 5 mi behind B757 is ferocious! Have followed many 'heavies' in my flying career on GS and closer than 5 mi. Never a problem, but now 2 times, 2 days in a row, on approach to lax 25L, our A300 rolled positively and, initially, unctlably. Seriously recommend greater spacing behind B757. (Greater than other 'heavies'). Callback conversation with reporter revealed the following information: captain said this happened 2 days in a row at lax. 757 was 7 NM in front of him on the ILS for runway 25L. Other traffic for the parallel runway, but was not a heavy, widebody transport or 757. ATC did not give a wake turbulence advisory, but did both days advise him that he was following a 757. Time of day was in period 3 both days and good VFR conditions 'for lax.' had runway in sight and doesn't know what type aircraft was ahead of the 757. First officer was flying and turbulence was 'significant' causing considerable left and right roll to the A300. Said purpose of the report was to advise ASRS of what he encountered and the effect it had on his A300.

Original NASA ASRS Text

Title: FLC OF ACR A300 ACFT LOST CTL OF ACFT ON ILS APCH 5 MI BEHIND AND APPROX 2000 FT ABOVE B757 ACFT DUE TO WAKE TURB.

Narrative: WAKE TURB 5 MI BEHIND B757 IS FEROCIOUS! HAVE FOLLOWED MANY 'HEAVIES' IN MY FLYING CAREER ON GS AND CLOSER THAN 5 MI. NEVER A PROB, BUT NOW 2 TIMES, 2 DAYS IN A ROW, ON APCH TO LAX 25L, OUR A300 ROLLED POSITIVELY AND, INITIALLY, UNCTLABLY. SERIOUSLY RECOMMEND GREATER SPACING BEHIND B757. (GREATER THAN OTHER 'HEAVIES'). CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CAPT SAID THIS HAPPENED 2 DAYS IN A ROW AT LAX. 757 WAS 7 NM IN FRONT OF HIM ON THE ILS FOR RWY 25L. OTHER TFC FOR THE PARALLEL RWY, BUT WAS NOT A HVY, WDB OR 757. ATC DID NOT GIVE A WAKE TURB ADVISORY, BUT DID BOTH DAYS ADVISE HIM THAT HE WAS FOLLOWING A 757. TIME OF DAY WAS IN PERIOD 3 BOTH DAYS AND GOOD VFR CONDITIONS 'FOR LAX.' HAD RWY IN SIGHT AND DOESN'T KNOW WHAT TYPE ACFT WAS AHEAD OF THE 757. FO WAS FLYING AND TURB WAS 'SIGNIFICANT' CAUSING CONSIDERABLE L AND R ROLL TO THE A300. SAID PURPOSE OF THE RPT WAS TO ADVISE ASRS OF WHAT HE ENCOUNTERED AND THE EFFECT IT HAD ON HIS A300.

Data retrieved from NASA's ASRS site as of July 2007 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.