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Crew Size.Number Of Crew : 2
Operating Under FAR Part : Part 91
Flight Plan : IFR
Mission : Passenger
Flight Phase : Initial Approach
Route In Use.STAR : RIIVR
Airspace.Class B : LAX.B
Person
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : Air Carrier
Function.Flight Crew : Pilot Flying
Function.Flight Crew : First Officer
Qualification.Flight Crew : Air Transport Pilot (ATP)
Experience.Flight Crew.Total : 5500
Experience.Flight Crew.Last 90 Days : 100
Experience.Flight Crew.Type : 400
ASRS Report Number.Accession Number : 824822
Events
Anomaly.Inflight Event / Encounter : Loss Of Aircraft Control
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
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
Cleared for RIIVR2 arrival, ILS Runway 25L at LAX, SOCAL approach cautioned that
there was a B757 10NM in front going to same runway. Had B757 lights in sight. I
was flying with a HUD and kept the flight path marker (FPM) above the B757. We
normally fly our descents using an FMS provided 2.5 degree descent angle until
established on the ILS glide slope. The 2.5 degree descent angle was keeping the
FPM above the B757 traffic. Our aircraft was on autopilot. We felt and commented
on the 'nibbles' of wake turbulence. Captain was implying I should take preemptive,
evasive action. We had a 25 knot headwind and I momentarily was trying
to figure out an alternative source of the 'nibbles' when we entered the wake and
were rocked and yawed noticeably. I disconnected autopilot and flew above the
FMS provided flight path. Captain and I discussed that placing the FPM above the
B757 is not enough, one must reference the B757 glide path defined by the B757
and the landing area and stay above this line (assuming the 757 is flying a constant
GP). No further wake was encountered on this approach. Time, altitude and
distance from LAX are all approximate to the best of my recollection.
Synopsis
An FA2000 encountered a B757 wake vortex at about 9000 ft on the LAX RIIVR to
Runway 25L. The reporter was using a HUD to remain above the traffic.
ACN: 824609 (35 of 50)
Time / Day
Date : 200902
Local Time Of Day : 1801-2400
Place
Locale Reference.Airport : VNY.Airport
State Reference : CA
Relative Position.Distance.Nautical Miles : 1.5
Altitude.AGL.Single Value : 350
Environment
Flight Conditions : VMC
Weather Elements / Visibility.Visibility : 10
Light : Night
Ceiling.Single Value : 20000
Aircraft
Reference : X
ATC / Advisory.Tower : VNY.Tower
Aircraft Operator : FBO
Make Model Name : Skylane 182/RG Turbo Skylane/RG
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
Route In Use.Other
Airspace.Class D : VNY.D
Person
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : FBO
Function.Flight Crew : Pilot Flying
Function.Flight Crew : Single Pilot
Qualification.Flight Crew : Private
Qualification.Flight Crew : Instrument
Experience.Flight Crew.Total : 724
Experience.Flight Crew.Last 90 Days : 8
Experience.Flight Crew.Type : 400
ASRS Report Number.Accession Number : 824609
Events
Anomaly.Inflight Event / Encounter : Loss Of Aircraft Control
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
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
I was about final for Runway 16R at VNY. A corporate jet (I believe it was a
Citation) had preceded me. Upon receiving my landing clearance while on
downwind (including 'follow the Citation for whatever, you're number two),' I
remember having received the obligatory 'caution wake turbulence' from the tower.
I waited until the jet was well past my '45' before turning base. I did so
approximately at the VA hospital, which is a frequent location referenced during
pattern or approach work at VNY. I was at a deliberately slow 70KIAS. I asked the
tower for a wind check when I was about 4 miles out, and heard, 'wind calm.' I did
notice that I needed a very slight left crab on final. At about 1.5 miles out, I
experienced a left-wing-lifting, rolling encounter I assumed was from the previous
　
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