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When Detected : In-flight
Result.Air Traffic Control : Issued New Clearance
Result.Air Traffic Control : Issued Advisory / Alert
Assessments
Contributing Factors / Situations : Procedure
Contributing Factors / Situations : Human Factors
Contributing Factors / Situations : Aircraft
Primary Problem : Procedure
Narrative: 1
We were on the RIIVR 2 Arrival just outside of the GRAMM fix. Our previous
clearance was for a 25L arrival. Approach Control was clearing us to transition to a
24R arrival. I was the pilot not flying and had to read back the clearance two or
three times. I was not sure what I might have read back that was in question so I
was being as deliberate and clear as possible. The pilot flying had the FMC loaded
and was waiting for me to verify the transition to 24R before executing. It was at
that time that we encountered jet wash and the aircraft rolled 20 to 30 degrees to
the left. My focus immediately went to what was causing it, to what extent we had
been upset, and if we needed to take any action to avoid further upset. After a few
seconds of scanning, the airplane settled down and I returned my focus to our
navigation. We were now tracking about 15 degrees left of what we had been
before the upset. I then checked the magenta navigation line and it appeared to be
slightly to the right of the aircraft track. I checked the panel and realized that the
LNAV had disengaged but the autopilot had not. Therefore there had been no
warning horn. I instructed the pilot flying to correct to the right. He began a
general correction to the right immediately. Of course he was still waiting for me to
verify the transition change. When I then looked at the LEGS page we had passed
the fix which had been loaded several seconds earlier while I was communicating
with Approach Control. I believe that was GRAMM. I tried to select RUSTT which is
the next fix but we were so close the FMC would not take that change. We selected
RIIVR, which is further ahead, and the FMC took that. Meanwhile SoCal had noticed
our track was off and called us several times to verify that we were making the
transition to 24R. The Controller's first call was slightly casual and simply asked if
we were making the change. I answered in the affirmative. He immediately called
back and informed us of traffic at our 7 o'clock position that would be tracking in
for 25L. I acknowledged that traffic. He immediately called again and restricted our
descent to 12,000 feet. After he saw that we were tracking to 24R, he released us
for the approach. We were never told that separation was compromised. It is
important to note that the entire event occurred in about a minute. At least six
radio transmissions; aircraft upset and recovery; navigation disengagement,
recognition and correction. I thought later that I should have told the Controller
that we had temporarily lost our lateral navigation and I think I would have but I
am not sure I could have fit it in before he noticed we were not making the turn for
24L.
Synopsis
Medium large transport flight crew suffers track deviation when a wake encounter
coincided with a runway change on the RIIVR 2 STAR to LAX.
ACN: 833422 (25 of 50)
Time / Day
Date : 200904
Local Time Of Day : 0601-1200
Place
Locale Reference.Airport : SFO.Airport
State Reference : CA
Altitude.MSL.Single Value : 5000
Environment
Flight Conditions : VMC
Ceiling : CLR
Aircraft : 1
Reference : X
ATC / Advisory.TRACON : NCT.TRACON
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
Nav In Use : FMS Or FMC
Nav In Use.Localizer/Glideslope/ILS : 28R
Flight Phase : Initial Approach
Route In Use : Visual Approach
Route In Use.Other
Airspace.Class B : SFO.B
Aircraft : 2
Reference : Y
ATC / Advisory.TRACON : NCT.TRACON
Aircraft Operator : Air Carrier
Make Model Name : B747 Undifferentiated or Other Model
Flight Phase : Initial Approach
Airspace.Class B : SFO.B
Person : 1
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : Air Carrier
Function.Flight Crew : Pilot Not Flying
Function.Flight Crew : First Officer
Experience.Flight Crew.Total : 6800
Experience.Flight Crew.Last 90 Days : 240
Experience.Flight Crew.Type : 300
ASRS Report Number.Accession Number : 833422
Person : 2
Reference : 2
Location Of Person.Aircraft : X
Reporter Organization : Air Carrier
Function.Flight Crew : Pilot Flying
Function.Flight Crew : Captain
　
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