B727-200 reporter experienced wake turbulence from a B747 on a visual approach to lax runway 25.

Attributes
ACN	345532
Time
Date	199608
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 5100 msl bound upper : 5100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual arrival other
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 : 10000 flight time type : 3000
ASRS Report	345532
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	inflight encounter other other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Air Traffic Incident	other

Narrative:

On aug/xx/96 while arriving on the civet 1 arrival into lax runway 25L approach, flaps were set at 15 degrees descending from 6000 ft and arriving close to 5100 ft. Our aircraft, a B727-200 series, was cleared to land behind a heavy B747 leaving 7000 ft on base to final. The controller confirmed we were 5.1 NM behind the traffic. As the B747 rolled out in front of us at 5100 ft our B727 went in a violent roll to the right. I applied full opposite aileron, rudder and power. The B727 was still on its way on its back when all of a sudden the controls took effect. We tried to stay above the GS, but this didn't work either. I broke the approach off to the dismay of the approach controller. On the ground in lax I was advised to contact approach control supervisor. We had some words, and I hope the matter is settled. If I didn't have a setting of flaps down, so I could use my outboard ailerons, the inboard ailerons wouldn't have been enough to counter the roll. We would have been on our back with no recovery. Callback conversation with reporter revealed the following information: reporter participated in the wake turbulence callback program. The reporter was very helpful and answered all of the questionnaire items.

Original NASA ASRS Text

Title: B727-200 RPTR EXPERIENCED WAKE TURB FROM A B747 ON A VISUAL APCH TO LAX RWY 25.

Narrative: ON AUG/XX/96 WHILE ARRIVING ON THE CIVET 1 ARR INTO LAX RWY 25L APCH, FLAPS WERE SET AT 15 DEGS DSNDING FROM 6000 FT AND ARRIVING CLOSE TO 5100 FT. OUR ACFT, A B727-200 SERIES, WAS CLRED TO LAND BEHIND A HVY B747 LEAVING 7000 FT ON BASE TO FINAL. THE CTLR CONFIRMED WE WERE 5.1 NM BEHIND THE TFC. AS THE B747 ROLLED OUT IN FRONT OF US AT 5100 FT OUR B727 WENT IN A VIOLENT ROLL TO THE R. I APPLIED FULL OPPOSITE AILERON, RUDDER AND PWR. THE B727 WAS STILL ON ITS WAY ON ITS BACK WHEN ALL OF A SUDDEN THE CTLS TOOK EFFECT. WE TRIED TO STAY ABOVE THE GS, BUT THIS DIDN'T WORK EITHER. I BROKE THE APCH OFF TO THE DISMAY OF THE APCH CTLR. ON THE GND IN LAX I WAS ADVISED TO CONTACT APCH CTL SUPVR. WE HAD SOME WORDS, AND I HOPE THE MATTER IS SETTLED. IF I DIDN'T HAVE A SETTING OF FLAPS DOWN, SO I COULD USE MY OUTBOARD AILERONS, THE INBOARD AILERONS WOULDN'T HAVE BEEN ENOUGH TO COUNTER THE ROLL. WE WOULD HAVE BEEN ON OUR BACK WITH NO RECOVERY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR PARTICIPATED IN THE WAKE TURB CALLBACK PROGRAM. THE RPTR WAS VERY HELPFUL AND ANSWERED ALL OF THE QUESTIONNAIRE ITEMS.

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.