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Reference : X
ATC / Advisory.TRACON : SCT
Aircraft Operator : Air Carrier
Make Model Name : B737-300
Crew Size.Number Of Crew : 2
Operating Under FAR Part : Part 121
Mission : Passenger
Nav In Use : FMS Or FMC
Flight Phase : Descent
Route In Use.STAR : SADDE SIX
Airspace.Class B : LAX
Component
Aircraft Component : Autoflight System
Aircraft Reference : X
Problem : Malfunctioning
Person : 1
Reference : 1
Location Of Person.Aircraft : X
Location In Aircraft : Flight Deck
Reporter Organization : Air Carrier
Function.Flight Crew : Captain
Qualification.Flight Crew : Air Transport Pilot (ATP)
Experience.Flight Crew.Last 90 Days : 172
Experience.Flight Crew.Type : 12000
ASRS Report Number.Accession Number : 844596
Human Factors : Human-Machine Interface
Human Factors : Situational Awareness
Person : 2
Reference : 2
Location Of Person.Aircraft : X
Location In Aircraft : Flight Deck
Reporter Organization : Air Carrier
Function.Flight Crew : First Officer
Experience.Flight Crew.Last 90 Days : 164
ASRS Report Number.Accession Number : 844590
Human Factors : Human-Machine Interface
Human Factors : Situational Awareness
Events
Anomaly.Aircraft Equipment Problem : Less Severe
Anomaly.Deviation - Track / Heading : All Types
Anomaly.Deviation - Procedural : Clearance
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.Air Traffic Control : Issued New Clearance
Assessments
Contributing Factors / Situations : Environment - Non Weather Related
Contributing Factors / Situations : Aircraft
Contributing Factors / Situations : Human Factors
Primary Problem : Environment - Non Weather Related
Narrative: 1
We were on the SADDE SIX arrival into LAX. Early on the arrival ATC advised us we
were following a heavy 757 and to be aware of wake turbulence. Between SYMON
and SADDE we experienced the wake turbulence from the preceding 757 about 20
miles ahead. We were leveling at 10,000 FT. As we were approaching SADDE from
the north, I noticed LNAV was no longer selected. No mode was selected and I told
the First Officer to come left to SMO. This occurred at .6 NM north of SADDE.
Seconds later Approach asked us if we were in a turn to SMO and further vectored
us left 050 to intercept the arrival to SMO. Our delay in the turn probably put us
closer to the Departure corridor than expected. I believe that the jolts from the
wake turbulence kicked off LNAV. I haven't experienced this phenomenon before, if
accurate. Nonetheless, I feel I should have checked systems more thoroughly and
more timely after a wake turbulence event to ensure no changes occurred.
Synopsis
The B737-300 encountered wake turbulence from a preceding B757, which
appeared to have disconnected the LNAV function of the auto flight system.
ACN: 844590 (9 of 50)
Time / Day
Date : 200907
Local Time Of Day : 1801-2400
Place
Locale Reference.Airport : LAX.Airport
State Reference : CA
Altitude.MSL.Single Value : 10000
Environment
Flight Conditions : VMC
Light : Daylight
Aircraft : 1
Reference : X
ATC / Advisory.TRACON : SCT
Aircraft Operator : Air Carrier
Make Model Name : B737-300
Crew Size.Number Of Crew : 2
Operating Under FAR Part : Part 121
Flight Plan : IFR
Mission : Passenger
Nav In Use : FMS Or FMC
Flight Phase : Descent
Route In Use.STAR : SADDE SIX
Airspace.Class B : ZZZ
Aircraft : 2
Reference : Y
ATC / Advisory.TRACON : SCT
Make Model Name : B757 Undifferentiated or Other Model
Operating Under FAR Part : Part 121
Nav In Use : FMS Or FMC
Flight Phase : Descent
Route In Use.STAR : SADDE SIX
Airspace.Class B : ZZZ
Component
Aircraft Component : Autoflight System
Aircraft Reference : X
Problem : Design
Person
Reference : 1
Location Of Person.Aircraft : x
Location In Aircraft : Flight Deck
Reporter Organization : Air Carrier
Function.Flight Crew : First Officer
Experience.Flight Crew.Last 90 Days : 164
ASRS Report Number.Accession Number : 844590
Human Factors : Workload
Human Factors : Situational Awareness
Human Factors : Human-Machine Interface
Human Factors : Distraction
Events
Anomaly.Aircraft Equipment Problem : Less Severe
Anomaly.Deviation - Track / Heading : All Types
Anomaly.Deviation - Procedural : Clearance
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