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Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
Detector.Person : Flight Crew
Detector.Person : Air Traffic Control
When Detected : In-flight
Result.Flight Crew : Returned To Clearance
Result.Flight Crew : Became Reoriented
Result.Air Traffic Control : Issued New Clearance
Assessments
Contributing Factors / Situations : Environment - Non Weather Related
Contributing Factors / Situations : ATC Equipment / Nav Facility / Buildings
Contributing Factors / Situations : Aircraft
Primary Problem : Ambiguous
Narrative: 1
On the SADDE SIX Arrival into LAX, the Approach Control told us we would be
following a heavy 757. Shortly thereafter we encountered some wake that rolled us
left and right about 15 degrees. We were in LNAV descending to 10,000' MSL and
slowing to 250 knots. About the time we were to turn from SADDE to BAYST, the
instruments showed the turn but the plane did not start turning. The Captain
noticed the LNAV was not engaged anymore and at the same time SoCal asked if
we were in our turn to which we replied yes because we had just noticed it. He
gave us a heading of 050 direct to Santa Monica. We were about a half of mile from
SADDE when this occurred. We complied and that was the end of the event. I think
this was something that would have been hard to prevent unless there was a
flashing light or a sound that indicated LNAV had disengaged such as when the
autopilot is turned off. The event was handled as well as it could have been and as
quickly as it could have been.
Synopsis
A B737 encountered B757 wake vortices on the LAX SADDE SIX arrival. LNAV
disconnected during the wake event without a crew alert causing a track deviation
when the aircraft did not intercept the SMO 261.
ACN: 844444 (10 of 50)
Time / Day
Date : 200907
Local Time Of Day : 0601-1200
Place
Locale Reference.Airport : ZZZ.Airport
State Reference : US
Altitude.MSL.Single Value : 700
Environment
Light : Daylight
Aircraft
Reference : X
ATC / Advisory.TRACON : ZZZ
Aircraft Operator : Air Carrier
Make Model Name : A320
Crew Size.Number Of Crew : 2
Operating Under FAR Part : Part 121
Flight Plan : IFR
Mission : Passenger
Flight Phase : Climb
Airspace.Class B : ZZZ
Component
Aircraft Component : Turbine Engine
Aircraft Reference : X
Problem : Malfunctioning
Person
Reference : 1
Location Of Person.Aircraft : X
Location In Aircraft : Flight Deck
Reporter Organization : Air Carrier
Function.Flight Crew : Captain
Function.Flight Crew : Pilot Flying
Qualification.Flight Crew : Air Transport Pilot (ATP)
ASRS Report Number.Accession Number : 844444
Events
Anomaly.Aircraft Equipment Problem : Critical
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
Detector.Person : Flight Crew
When Detected : In-flight
Result.Flight Crew : Diverted
Result.Flight Crew : Returned To Departure Airport
Result.Flight Crew : Landed As Precaution
Assessments
Contributing Factors / Situations : Environment - Non Weather Related
Contributing Factors / Situations : Airspace Structure
Contributing Factors / Situations : Aircraft
Primary Problem : Environment - Non Weather Related
Narrative: 1
During takeoff encountered light turbulence from aircraft departing ahead. Heard
loud bang, loss of number 2 eng power about 50%. ECAM number 2 eng stall. Went
through QRH/emergency procedures. Engine restarted itself. Contacted Dispatch
and Maintenance Control. Advised to return to our departure airport for inspection.
Advised flight attendants and passengers whenever possible of what was happening.
Returned to overweight landing at 139,700 LBS at 100-200 FT per min at touch
down. Suspect airflow disruption from aircraft, which departed ahead of us.
Synopsis
A320 Captain reports encountering wake vortex from preceding aircraft that caused
compressor stall and restart. Crew elected to return to departure airport for
maintenance inspection.
ACN: 842039 (11 of 50)
Time / Day
Date : 200907
Local Time Of Day : 0601-1200
Place
Locale Reference.Airport : ZZZ.Airport
State Reference : US
Altitude.AGL.Single Value : 0
Person
Reference : 1
Location Of Person.Aircraft : X
Location In Aircraft : Flight Deck
Reporter Organization : Personal
Function.Flight Crew : Pilot Flying
Function.Flight Crew : Single Pilot
Qualification.Flight Crew : Private
Experience.Flight Crew.Total : 69.0
Experience.Flight Crew.Last 90 Days : 1.5
Experience.Flight Crew.Type : 60.6
　
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