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Operating Under FAR Part : Part 121
Flight Plan : IFR
Mission : Passenger
Flight Phase : Descent
Route In Use.STAR : WATSN
Airspace.Class A : ZAU.A
Aircraft : 2
Reference : Y
Make Model Name : B767 Undifferentiated or Other Model
Flight Plan : IFR
Flight Phase : Descent
Airspace.Class A : ZAU.A
Person
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : Air Carrier
Function.Flight Crew : Pilot Not Flying
Function.Flight Crew : Captain
Qualification.Flight Crew : Air Transport Pilot (ATP)
Experience.Flight Crew.Total : 7000
Experience.Flight Crew.Last 90 Days : 40
Experience.Flight Crew.Type : 3000
ASRS Report Number.Accession Number : 820992
Events
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
Detector.Person : Flight Crew
Result.Flight Crew : Took Evasive Action
Assessments
Contributing Factors / Situations : Environment - Non Weather Related
Primary Problem : Environment - Non Weather Related
Narrative: 1
Flight to ORD, on the WATSN 1 arrival, we encountered wake turbulence on three
occasions. We were just outside HAUPO at FL240. The winds aloft were on the nose
at 85 KTS. The jet rolled up to 25 degrees left and right and the First Officer
disconnected the autopilot and flew manually. We did not diverge from altitude. I
asked what type of aircraft we were following and was told by ATC that we were
following a B757. On the approach we touch the turbulence again and also on final.
I requested that we were going to displace right of course on the localizer for
Runway 27L. I asked if we could side step to Runway 27R but were told that we
would have to go around and re-enter the pattern. We decided to continue the
approach. I asked what type of aircraft and the final controller stated that it was a
heavy B767. Callback conversation with reporter revealed the following
information: The reporter states that they were in trail of the preceding aircraft
approximately 20 miles. The second incident was at about 12000 FT and the one on
final occurred around 4000 FT. During the final approach they elected to offset from
the localizer upwind and flew the glide slope one dot high. The same aircraft was
followed throughout the arrival. It was reported erroneously to be a B757 initially
and corrected to a B767 during approach.
Synopsis
A B737 encounters wake turbulence several times during arrival in trail of a B767
beginning at FL240 and ending at 4000 ft.
ACN: 820952 (38 of 50)
Time / Day
Date : 200901
Local Time Of Day : 1201-1800
Place
Locale Reference.Airport : SNA.Airport
State Reference : CA
Altitude.MSL.Single Value : 2000
Environment
Flight Conditions : VMC
Light : Daylight
Aircraft : 1
Reference : X
Aircraft Operator : Air Carrier
Make Model Name : B737-700
Crew Size.Number Of Crew : 2
Operating Under FAR Part : Part 121
Flight Plan : IFR
Mission : Passenger
Flight Phase : Initial Climb
Route In Use.SID : MUSEL
Airspace.Class C : SNA.C
Aircraft : 2
Reference : Y
Aircraft Operator : Air Carrier
Make Model Name : Airbus Industrie Undifferentiated or Other Model
Operating Under FAR Part : Part 121
Flight Plan : IFR
Mission : Passenger
Flight Phase : Initial Climb
Airspace.Class C : SNA.C
Person
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : Air Carrier
Function.Flight Crew : First Officer
Function.Flight Crew : Pilot Not Flying
Experience.Flight Crew.Last 90 Days : 216
Experience.Flight Crew.Type : 2100
ASRS Report Number.Accession Number : 820952
Events
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
Anomaly.Inflight Event / Encounter : Loss Of Aircraft Control
Detector.Person : Flight Crew
Result.Flight Crew : Regained Aircraft Control
Assessments
Contributing Factors / Situations : Environment - Non Weather Related
Primary Problem : Environment - Non Weather Related
Narrative: 1
Tower was working hard to clear aircraft ahead of us and around us to ensure we
would make our flow time. Another carrier Airbus that was ahead of us had delayed
their first takeoff clearance I think because of lack of takeoff data. Finally, they
were ready for takeoff . Tower cleared us into position and hold and then for
takeoff. I estimate that they were about 1000-1500 ft in the air when we started
our takeoff roll. The Captain was established on the 175 heading on the MUSEL
departure with the power in the cutback position when he turned on the autopilot.
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