<< >> NASA ASRS Report 1438755, April 2017

A319 flight crew reported an 'aggressive' roll resulted after encountering wake turbulence at FL320 from a crossing A300. A flight attendant hit her head during the encounter.

Attributes
ACN	1438755
Time
Date	201704
Local Time Of Day	1801-2400
Place
Locale Reference	ZLC.ARTCC
State Reference	UT
Environment
Light	Night
Aircraft 1
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Aircraft 2
Make Model Name	A300
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 160 Flight Crew Type 4185
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 70 Flight Crew Type 710
Events
Anomaly	ATC Issue All Types Flight Deck / Cabin / Aircraft Event Illness Inflight Event / Encounter Wake Vortex Encounter

Narrative:

While at FL320 in completely smooth air we encountered a jolt of moderate turbulence lasting approximately 2 seconds. This was followed by another jolt of turbulence lasting 2-3 seconds that was moderate to more than moderate; but not fitting of the definition of severe in intensity (fom); and about 3-5 seconds after the first encounter. In our vicinity an airplane had just passed in front and above us and was abeam our aircraft when the turbulence was encountered. I immediately suspected a wake encounter. This occurred about 100 miles south-southeast of bil. We asked ATC what kind of aircraft it was and he said his designation was a heavy airbus A300. A flight attendant in the rear of the aircraft reported bumping her head. No other injuries to passengers and crew.

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Original NASA ASRS Text

Title: A319 flight crew reported an 'aggressive' roll resulted after encountering wake turbulence at FL320 from a crossing A300. A Flight Attendant hit her head during the encounter.

Narrative: While at FL320 in completely smooth air we encountered a jolt of moderate turbulence lasting approximately 2 seconds. This was followed by another jolt of turbulence lasting 2-3 seconds that was moderate to more than moderate; but not fitting of the definition of severe in intensity (FOM); and about 3-5 seconds after the first encounter. In our vicinity an airplane had just passed in front and above us and was abeam our aircraft when the turbulence was encountered. I immediately suspected a wake encounter. This occurred about 100 miles south-southeast of BIL. We asked ATC what kind of aircraft it was and he said his designation was a Heavy Airbus A300. A flight attendant in the rear of the aircraft reported bumping her head. No other injuries to passengers and crew.

Data retrieved from NASA's ASRS site 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.