B737-800 at FL350 encounters wake turbulence 13 mi in trail of a B757 that had climbed to FL370.

Attributes
ACN	665933
Time
Date	200507
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : drk.vortac
State Reference	AZ
Altitude	msl single value : 35000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	665933
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	665934
Events
Anomaly	conflict : airborne less severe inflight encounter : wake turbulence
Independent Detector	other flight crewa other flight crewb
Consequence	other
Supplementary
Problem Areas	Airspace Structure Environmental Factor
Primary Problem	Airspace Structure

Narrative:

We encountered wake turbulence at 35000 ft. We rolled left 30 degrees followed by a roll to the right of 30 degrees followed by a roll of 45 to 55 degrees of bank to the left. It took full opposite aileron to right the aircraft. After informing center of the encounter; we asked about traffic in our area. The only aircraft along our route of flight was a B757 at 37000 ft. Seat belt sign was still on; and the flight attendants reported no injuries to themselves or to the passenger. Dispatch was notified as well (thru dispatcher). An entry was made for a possible turbulence inspection. Flight landed uneventfully at dfw. Im my opinion; this was caused by the rvsm program. Supplemental information from acn 665934: following a B757 who had climbed up to FL370; our airspeed was .79; we were about 13 mi in trail of the B757; the winds were very light at our altitude.

Original NASA ASRS Text

Title: B737-800 AT FL350 ENCOUNTERS WAKE TURB 13 MI IN TRAIL OF A B757 THAT HAD CLBED TO FL370.

Narrative: WE ENCOUNTERED WAKE TURB AT 35000 FT. WE ROLLED L 30 DEGS FOLLOWED BY A ROLL TO THE R OF 30 DEGS FOLLOWED BY A ROLL OF 45 TO 55 DEGS OF BANK TO THE L. IT TOOK FULL OPPOSITE AILERON TO RIGHT THE ACFT. AFTER INFORMING CTR OF THE ENCOUNTER; WE ASKED ABOUT TFC IN OUR AREA. THE ONLY ACFT ALONG OUR RTE OF FLT WAS A B757 AT 37000 FT. SEAT BELT SIGN WAS STILL ON; AND THE FLT ATTENDANTS RPTED NO INJURIES TO THEMSELVES OR TO THE PAX. DISPATCH WAS NOTIFIED AS WELL (THRU DISPATCHER). AN ENTRY WAS MADE FOR A POSSIBLE TURB INSPECTION. FLT LANDED UNEVENTFULLY AT DFW. IM MY OPINION; THIS WAS CAUSED BY THE RVSM PROGRAM. SUPPLEMENTAL INFO FROM ACN 665934: FOLLOWING A B757 WHO HAD CLBED UP TO FL370; OUR AIRSPEED WAS .79; WE WERE ABOUT 13 MI IN TRAIL OF THE B757; THE WINDS WERE VERY LIGHT AT OUR ALT.

Data retrieved from NASA's ASRS site as of January 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.