Reporter encounters L-1011 wake turbulence.

Attributes
ACN	316546
Time
Date	199509
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sli airport : lax
State Reference	CA
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax tower : phl
Operator	common carrier : air carrier
Make Model Name	Jetstream 32
Operating Under FAR Part	Part 135
Flight Phase	cruise other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	L-1011 Tri-Star All Series
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 150 flight time total : 7000 flight time type : 3500
ASRS Report	315646
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	inflight encounter other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : exited adverse environment flight crew : regained aircraft control
Consequence	faa : reviewed incident with flight crew Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

While flying at 7000 ft in cruise condition about 20 mi south of seal beach VOR, I saw an L-1011 pass us at 8000 ft heading the same direction (north). I heard approach control clear the L-1011 to 7000 ft (our altitude) and slow. At 2 mi south of seal beach we encountered severe wake turbulence. Our airplane went into a rapid roll to the left and the plane pitched down. After recovery I asked ATC what the distance was between us and the L-1011. They would not answer me until I asked 3 times. Then they said current distance 8 1/4 mi.

Original NASA ASRS Text

Title: RPTR ENCOUNTERS L-1011 WAKE TURB.

Narrative: WHILE FLYING AT 7000 FT IN CRUISE CONDITION ABOUT 20 MI S OF SEAL BEACH VOR, I SAW AN L-1011 PASS US AT 8000 FT HEADING THE SAME DIRECTION (N). I HEARD APCH CTL CLR THE L-1011 TO 7000 FT (OUR ALT) AND SLOW. AT 2 MI S OF SEAL BEACH WE ENCOUNTERED SEVERE WAKE TURB. OUR AIRPLANE WENT INTO A RAPID ROLL TO THE L AND THE PLANE PITCHED DOWN. AFTER RECOVERY I ASKED ATC WHAT THE DISTANCE WAS BTWN US AND THE L-1011. THEY WOULD NOT ANSWER ME UNTIL I ASKED 3 TIMES. THEN THEY SAID CURRENT DISTANCE 8 1/4 MI.

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.