Flight crew of large transport making short interval takeoff behind advanced large transport experienced wake turbulence form takeoff up to 2000' following the advanced large transport.

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Attributes
ACN	156250
Time
Date	199008
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax tower : lax
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : initial climbout : takeoff climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : takeoff climbout : intermediate altitude climbout : initial
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : atp pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 7000 flight time type : 3000
ASRS Report	156250
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We were cleared onto runway 25L at lax. The sky was clear and winds were 250 degrees at 9 KTS. An large transport advanced was on its takeoff roll. We were flying an large transport with -15 engines and relatively light at about 140000 pounds. As the large transport advc started its rotation, we were cleared for takeoff. We started our takeoff roll right after receiving the clearance, not making any allowances for the large transport advanced cockpit. Right after liftoff at about 100' AGL, we encountered the wake vortices of the large transport advanced cockpit and we were in them until about 2000' MSL. During that time we experienced very rapid roll rates, with the aircraft rolling 45 degrees left and right, and full aileron often required to keep the aircraft right side up. With no sep requirements for the large transport advanced cockpit mandated by the FAA at this time, this pilot will be requesting additional sep from large transport advanced cockpit aircraft and strongly suggests the FAA consider treating the large transport advanced cockpit as a heavy for sep requirements.

Original NASA ASRS Text

Title: FLT CREW OF LGT MAKING SHORT INTERVAL TKOF BEHIND ADVANCED LGT EXPERIENCED WAKE TURBULENCE FORM TKOF UP TO 2000' FOLLOWING THE ADVANCED LGT.

Narrative: WE WERE CLRED ONTO RWY 25L AT LAX. THE SKY WAS CLR AND WINDS WERE 250 DEGS AT 9 KTS. AN LGT ADVANCED WAS ON ITS TKOF ROLL. WE WERE FLYING AN LGT WITH -15 ENGS AND RELATIVELY LIGHT AT ABOUT 140000 LBS. AS THE LGT ADVC STARTED ITS ROTATION, WE WERE CLRED FOR TKOF. WE STARTED OUR TKOF ROLL RIGHT AFTER RECEIVING THE CLRNC, NOT MAKING ANY ALLOWANCES FOR THE LGT ADVANCED COCKPIT. RIGHT AFTER LIFTOFF AT ABOUT 100' AGL, WE ENCOUNTERED THE WAKE VORTICES OF THE LGT ADVANCED COCKPIT AND WE WERE IN THEM UNTIL ABOUT 2000' MSL. DURING THAT TIME WE EXPERIENCED VERY RAPID ROLL RATES, WITH THE ACFT ROLLING 45 DEGS LEFT AND RIGHT, AND FULL AILERON OFTEN REQUIRED TO KEEP THE ACFT RIGHT SIDE UP. WITH NO SEP REQUIREMENTS FOR THE LGT ADVANCED COCKPIT MANDATED BY THE FAA AT THIS TIME, THIS PLT WILL BE REQUESTING ADDITIONAL SEP FROM LGT ADVANCED COCKPIT ACFT AND STRONGLY SUGGESTS THE FAA CONSIDER TREATING THE LGT ADVANCED COCKPIT AS A HVY FOR SEP REQUIREMENTS.

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.