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Experience.Flight Crew.Total : 6500
Experience.Flight Crew.Last 90 Days : 120
Experience.Flight Crew.Type : 900
ASRS Report Number.Accession Number : 836708
Human Factors : Communication Breakdown
Communication Breakdown.Party1 : Flight Crew
Communication Breakdown.Party2 : ATC
Events
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
Detector.Person : Flight Crew
When Detected : In-flight
Result.General : None Reported / Taken
Assessments
Contributing Factors / Situations : Human Factors
Contributing Factors / Situations : Environment - Non Weather Related
Primary Problem : Human Factors
Narrative: 1
Our aircraft was in level cruise flight @ 16,000 FT approaching the VOR with direct
routing after. I noticed an aircraft turning to a westerly heading and climbing below
our altitude to 14,000FT. I was able to determine from ATC communications that
the other aircraft was a B737 departing. The Approach Controller contacted us and
asked if we saw the other aircraft and could maintain a visual separation. We
replied affirmative and the B737 was issued a climb through our altitude. It became
quickly apparent that the B737 was continuing on a common course, which was not
explained by the Controller. I observed the B737 climbing through our altitude and
immediately asked ATC for a 1NM offset to the right of course. From the FMS
display, I determined that direction was slightly to the upwind side of our course,
although the wind direction at our altitude was essentially a direct headwind. We
were immediately cleared, I entered the command into the FMS and the aircraft
began a right turn to fly the offset. At that point we encountered the wake, which
rolled the aircraft to the right (left wing vortex from the generator aircraft). We
quickly flew out of it, and while the encounter created a non-standard roll, it did not
disengage the autopilot. I felt like we were set up for this encounter by not being
advised by the Controller of the common course the other aircraft was to fly. Had
we been advised of the common course, I would not have accepted the "visual
separation" between the aircraft. The in-trail spacing was approximately 3-4NM at
the time of the visual clearance, and approximately 5-6NM at point of encounter.
We advised ATC of the encounter, by which she replied "roger."
Synopsis
A CE560XL First Officer reported a wake encounter with a B737 that rolled the
aircraft to the right. The reporter stated the incident could have been avoided if
ATC had been clearer about the relative tracks of the aircraft involved.
ACN: 835675 (24 of 50)
Time / Day
Date : 200905
Local Time Of Day : 0601-1200
Place
Locale Reference.Airport : LAX.Airport
State Reference : CA
Relative Position.Distance.Nautical Miles : 65
Altitude.MSL.Single Value : 14000
Environment
Flight Conditions : VMC
Light : Daylight
Aircraft
Reference : X
ATC / Advisory.TRACON : SCT
Aircraft Operator : Air Carrier
Make Model Name : Medium Large Transport, Low Wing, 2 Turbojet Eng
Crew Size.Number Of Crew : 2
Operating Under FAR Part : Part 121
Flight Plan : IFR
Mission : Passenger
Flight Phase : Descent
Route In Use.STAR : RIIVR 2
Airspace.Class B : LAX
Component
Aircraft Component : Autoflight System
Aircraft Reference : X
Problem : Failed
Person : 1
Reference : 1
Location Of Person.Aircraft : X
Location In Aircraft : Flight Deck
Reporter Organization : Air Carrier
Function.Flight Crew : Captain
Function.Flight Crew : Pilot Not Flying
Qualification.Flight Crew : Air Transport Pilot (ATP)
Experience.Flight Crew.Last 90 Days : 152
ASRS Report Number.Accession Number : 835675
Human Factors : Distraction
Human Factors : Workload
Person : 2
Reference : 2
Location Of Person.Aircraft : X
Location In Aircraft : Flight Deck
Reporter Organization : Air Carrier
Function.Flight Crew : First Officer
Function.Flight Crew : Pilot Flying
Experience.Flight Crew.Last 90 Days : 228
Experience.Flight Crew.Type : 4300
Human Factors : Workload
Human Factors : Distraction
Events
Anomaly.Aircraft Equipment Problem : Less Severe
Anomaly.Conflict : Airborne Conflict
Anomaly.Deviation - Track / Heading : All Types
Anomaly.Deviation - Procedural : Clearance
Anomaly.Deviation - Procedural : Published Material / Policy
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
Detector.Person : Flight Crew
Detector.Person : Air Traffic Control
Were Passengers Involved In Event : N
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