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Flight Conditions : Mixed
Light : Daylight
Ceiling.Single Value : 2800
Aircraft
Reference : X
ATC / Advisory.TRACON : C90.TRACON
Aircraft Operator : Air Carrier
Make Model Name : Regional Jet 700 ER/LR (CRJ700)
Crew Size.Number Of Crew : 2
Operating Under FAR Part : Part 121
Flight Plan : IFR
Mission : Passenger
Flight Phase : Initial Approach
Route In Use : Vectors
Airspace.Class B : ORD.B
Person
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : Air Carrier
Function.Flight Crew : Pilot Not Flying
Function.Flight Crew : First Officer
Qualification.Flight Crew : Commercial
Qualification.Flight Crew : Flight Instructor
Qualification.Flight Crew : Instrument
Qualification.Flight Crew : Multiengine
Experience.Flight Crew.Total : 740
Experience.Flight Crew.Last 90 Days : 150
Experience.Flight Crew.Type : 370
ASRS Report Number.Accession Number : 825613
Events
Anomaly.Deviation - Procedural : Clearance
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
Detector.Person : Flight Crew
Result.Flight Crew : Overrode Automation
Result.Flight Crew : Took Evasive Action
Result.Air Traffic Control : Issued Advisory / Alert
Result.Air Traffic Control : Issued New Clearance
Assessments
Contributing Factors / Situations : Human Factors
Contributing Factors / Situations : ATC Equipment / Nav Facility / Buildings
Contributing Factors / Situations : Airport
Primary Problem : Ambiguous
Narrative: 1
We were on the radio with Chicago Approach. We were assigned 330 knots about 5
minutes prior to the occurrence. We were maintaining the 300 knots. As the pilot
not flying, I was completing the 'in range checklist' when we encountered wake
turbulence. It was the first time I have experienced wake turbulence. The Captain
controlled and stabilized the aircraft. We were asked 'say speed' by approach, I
looked up from the checklist and replied '250 knots.' They reassigned us 300 knots.
We then hit turbulence again. The second time was more violent than the first, and
the Captain clicked off autopilot and hand flew the aircraft slightly above the glide
slope to alleviate encountering any further turbulence. The Captain asked me to
advise the Approach Controller of the wake turbulence we were encountering (then
we hit our third pocket of wake turbulence), however the radio was too saturated
to do so, until we were established on the approach. We then told the Controller
that we had encountered turbulence three times, eliciting no reply. Then they came
back on the radio and assigned us a number to call. The Captain told me during the
event that he was acting in what he thought was the safest manner possible. I
believe this to be the case as well. I had no prior experience with wake turbulence
and given the events, I believe his actions clearly took safety as the priority.
Synopsis
A CRJ-700 First Officer reports the Captain's desire to fly at 250 kts when
previously assigned 300 kts because of three wake turbulence encounters on
approach to ORD. This was the First Officer's first career wake turbulence
encounter.
ACN: 825124 (31 of 50)
Time / Day
Date : 200408
Local Time Of Day : 0601-1200
Place
Locale Reference.Airport : ZZZ.Airport
State Reference : US
Altitude.MSL.Single Value : 85
Environment
Flight Conditions : VMC
Weather Elements / Visibility.Visibility : 10
Light : Daylight
Ceiling.Single Value : 10000
Aircraft : 1
Reference : X
ATC / Advisory.CTAF : ZZZ
Aircraft Operator : FBO
Make Model Name : PA-28 Cherokee/Archer/Dakota/Warrior
Crew Size.Number Of Crew : 1
Operating Under FAR Part : Part 91
Flight Plan : None
Mission : Training
Flight Phase : Initial Approach
Route In Use : Visual Approach
Airspace.Class G : ZZZ.G
Aircraft : 2
Reference : Y
ATC / Advisory.CTAF : ZZZ
Aircraft Operator : FBO
Make Model Name : Skyhawk 172/Cutlass 172
Crew Size.Number Of Crew : 1
Operating Under FAR Part : Part 91
Flight Plan : None
Mission : Training
Flight Phase : Landing
Person
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : FBO
Function.Flight Crew : Single Pilot
Function.Flight Crew : Pilot Flying
Qualification.Flight Crew : Student
Experience.Flight Crew.Total : 36
Experience.Flight Crew.Last 90 Days : 21
Experience.Flight Crew.Type : 15
ASRS Report Number.Accession Number : 825124
Events
Anomaly.Conflict : Ground Conflict, Less Severe
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
　
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