Wake turbulence encounter from a B757 at FL290.

Attributes
ACN	479235
Time
Date	200007
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : las.airport
State Reference	NV
Altitude	msl single value : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
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
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8500 flight time type : 500
ASRS Report	479235
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter : wake turbulence
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Environmental Factor
Primary Problem	Environmental Factor

Narrative:

In cruise at FL290, smooth air, VMC, clear, 40 KT direct tailwind. We suddenly got some moderate chop, followed by light turbulence and an abrupt 30 degree roll to the right. The autoplt recovered to level flight in about 3 seconds and it became smooth again. Upon querying ZLA, we learned that a B757 was climbing through our altitude on the way up to FL350. The B757 was 10 NM in front of our A319 when it climbed through our altitude. No injuries, but the wake encounter was quite sudden and violent. Just another example of a B757 wake, but this time at cruise altitude.

Original NASA ASRS Text

Title: WAKE TURB ENCOUNTER FROM A B757 AT FL290.

Narrative: IN CRUISE AT FL290, SMOOTH AIR, VMC, CLR, 40 KT DIRECT TAILWIND. WE SUDDENLY GOT SOME MODERATE CHOP, FOLLOWED BY LIGHT TURB AND AN ABRUPT 30 DEG ROLL TO THE R. THE AUTOPLT RECOVERED TO LEVEL FLT IN ABOUT 3 SECONDS AND IT BECAME SMOOTH AGAIN. UPON QUERYING ZLA, WE LEARNED THAT A B757 WAS CLBING THROUGH OUR ALT ON THE WAY UP TO FL350. THE B757 WAS 10 NM IN FRONT OF OUR A319 WHEN IT CLBED THROUGH OUR ALT. NO INJURIES, BUT THE WAKE ENCOUNTER WAS QUITE SUDDEN AND VIOLENT. JUST ANOTHER EXAMPLE OF A B757 WAKE, BUT THIS TIME AT CRUISE ALT.

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.