A C550 encountered wake turbulence from a B757 and rolled sharply 90-100 degree. After conferring with dispatch and maintenance the flight crew diverted to another airport.

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Attributes
ACN	795623
Time
Date	200807
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : las.airport
State Reference	NV
Altitude	msl single value : 34500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Aircraft 2
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5000 flight time type : 1700
ASRS Report	795623
Events
Anomaly	inflight encounter : wake turbulence
Independent Detector	other flight crewa
Resolutory Action	flight crew : diverted to another airport flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Environmental Factor ATC Human Performance
Primary Problem	Environmental Factor

Narrative:

We were much lower than expected and were issued step climbs in order to facilitate eastbound traffic out of the la area. We were east of las by 20 NM heading towards norra intersection at 33000 ft. We were issued a climb to FL350 by ATC. During the climb at FL345; we entered the wake of a 757 (ATC said they were 8 miles ahead) and the aircraft snapped sharply to the right (approximately 90-100 degrees); the autoplt kicked off and we righted the aircraft. Captain was PNF; first officer was PF. After letting ATC know what happened; we were given a heading off the airway and then given a 'direct to' further down our filed route. After calling dispatch and maintenance; we decided to divert to a service center in order to have the aircraft looked at. Large indentations appeared in the wing upper surface on each wing -- 1 foot forward of the trailing edge and 3 to 4 ft from the fuselage. There was also a smaller set of indentations on the underside of each wing 6 ft from the tip and 6 to 8 inches back from the leading edge.

Original NASA ASRS Text

Title: A C550 ENCOUNTERED WAKE TURBULENCE FROM A B757 AND ROLLED SHARPLY 90-100 DEG. AFTER CONFERRING WITH DISPATCH AND MAINT THE FLT CREW DIVERTED TO ANOTHER ARPT.

Narrative: WE WERE MUCH LOWER THAN EXPECTED AND WERE ISSUED STEP CLBS IN ORDER TO FACILITATE EASTBOUND TFC OUT OF THE LA AREA. WE WERE EAST OF LAS BY 20 NM HEADING TOWARDS NORRA INTXN AT 33000 FT. WE WERE ISSUED A CLB TO FL350 BY ATC. DURING THE CLB AT FL345; WE ENTERED THE WAKE OF A 757 (ATC SAID THEY WERE 8 MILES AHEAD) AND THE ACFT SNAPPED SHARPLY TO THE RIGHT (APPROX 90-100 DEGS); THE AUTOPLT KICKED OFF AND WE RIGHTED THE ACFT. CAPT WAS PNF; FO WAS PF. AFTER LETTING ATC KNOW WHAT HAPPENED; WE WERE GIVEN A HEADING OFF THE AIRWAY AND THEN GIVEN A 'DIRECT TO' FURTHER DOWN OUR FILED RTE. AFTER CALLING DISPATCH AND MAINT; WE DECIDED TO DIVERT TO A SVC CENTER IN ORDER TO HAVE THE ACFT LOOKED AT. LARGE INDENTATIONS APPEARED IN THE WING UPPER SURFACE ON EACH WING -- 1 FOOT FORWARD OF THE TRAILING EDGE AND 3 TO 4 FT FROM THE FUSELAGE. THERE WAS ALSO A SMALLER SET OF INDENTATIONS ON THE UNDERSIDE OF EACH WING 6 FT FROM THE TIP AND 6 TO 8 INCHES BACK FROM THE LEADING EDGE.

Data retrieved from NASA's ASRS site as of May 2009 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.