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Experience.Flight Crew.Total : 17300
Experience.Flight Crew.Last 90 Days : 150
Experience.Flight Crew.Type : 5330
ASRS Report Number.Accession Number : 833428
Events
Anomaly.Deviation - Procedural : Published Material / Policy
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
Detector.Person : Flight Crew
Result.General : None Reported / Taken
Result.Air Traffic Control : Issued New Clearance
Assessments
Contributing Factors / Situations : Human Factors
Contributing Factors / Situations : Environment - Non Weather Related
Primary Problem : Human Factors
Narrative: 1
Shortly after being cleared for the LDA PRM 28R to SFO we noticed that we were
not receiving the required LDA DME. We advised ATC of this and that we had the
proceeding aircraft on the ILS Runway 28L and the SFO runways in sight. We were
subsequently cleared for the visual approach to Runway 28R, to maintain 180 KTS
until the bridge and to not pass the aircraft on the ILS approach to Runway 28L.
We continued to fly the LDA PRM localizer and glideslope for ground track and
altitude guidance to DARNE. Prior to the bridge when the other aircraft lowered
their gear we noticed it was a heavy B747. ATC had not advised us. After DARNE
we maneuvered to intercept the centerline of Runway 28R and encountered some
wake turbulence on short final. Reviewing the approach later we noted FOM which
requires 5 miles separation between large aircraft following heavy aircraft to the
same runway or parallel runways separated by less than 2500 FT. Runways 28L
and 28R are separated by 750 FT. The procedure also requires the pilot to maintain
wake turbulence avoidance between DARNE and Runway 28R. What we learned.
The A319/320 flight manual says nothing about tuning the LDA PRM DME manually
in the FMGC when conducting an LDA with glideslope information. We realized later
after reviewing the back course procedures in the FM that this is also necessary for
this approach. Second we question how it is physically possible for the pilot to
maintain wake turbulence separation inside of DARNE if ATC spacing of aircraft
pairs on the ILS Runway 28L and LDA PRM Runway 28R is less than 5 miles outside
of DARNE by normal ATC procedure. 5 mile separation would have been possible
for us if ATC had advised us to slow earlier due to heavy aircraft to Runway 28L.
Our other option was to miss approach when we realized the uncorrectable
separation during the approach.
Synopsis
A320 flight crew reports being cleared for the LDA PRM 28R at SFO and switching
to visual when DME appears inoperative. The visual is behind a B747 landing
Runway 28L. After landing the crew discovers the spacing did not satisfy flight
manual requirements for approach and landing on closely spaced runways.
ACN: 833154 (26 of 50)
Time / Day
Date : 200904
Local Time Of Day : 0601-1200
Place
Locale Reference.Airport : ZZZ.Airport
State Reference : US
Altitude.AGL.Single Value : 50
Environment
Flight Conditions : VMC
Light : Daylight
Aircraft : 1
Reference : X
ATC / Advisory.CTAF : zzz
Aircraft Operator : Personal
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 : Passenger
Flight Phase : Initial Approach
Route In Use.Other
Airspace.Class G : ZZZ.G
Aircraft : 2
Reference : Y
Aircraft Operator : Government
Make Model Name : Helicopter
Operating Under FAR Part : Part 91
Flight Phase : Initial Approach
Airspace.Class G : ZZZ.G
Person
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : Personal
Function.Flight Crew : Pilot Not Flying
Function.Other
Qualification.Flight Crew : Private
Experience.Flight Crew.Total : 1200
Experience.Flight Crew.Last 90 Days : 30
Experience.Flight Crew.Type : 400
ASRS Report Number.Accession Number : 833154
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
Result.Flight Crew : Executed Go Around / Missed Approach
Assessments
Contributing Factors / Situations : Aircraft
Contributing Factors / Situations : Environment - Non Weather Related
Contributing Factors / Situations : Airport
Primary Problem : Environment - Non Weather Related
Narrative: 1
My son (a new pilot) flew me in a PA28-180, so that I could pick my up airplane
that had been serviced by the local FBO. I am a 1,200 hour pilot and have been
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