Close proximity air carrier-widebody transport air carrier-large transport on visual approach to sfo. Reporter in widebody transport was cleared to stay behind the large transport but claims they could not comply.

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Attributes
ACN	127305
Time
Date	198911
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : sfo
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent other landing other
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 170 flight time total : 8000 flight time type : 400
ASRS Report	127305
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 18000 flight time type : 2000
ASRS Report	127736
Events
Anomaly	conflict : airborne less severe non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 800 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cleared visual 28L to stay behind air carrier Y large transport for 28R. As we slowed to approach speed at about 2000' we saw the large transport slow. At approach speed we were faster than large transport. As we passed the large transport he began turning towards us on final. I informed captain and he moved to the left to stay clear. He then took radio and said for air carrier Y to stay on their own side. The problem was to follow the large transport and we were unable on short final to do so and air carrier Y large transport crossed centerline into our area on final.

Original NASA ASRS Text

Title: CLOSE PROX ACR-WDB ACR-LGT ON VISUAL APCH TO SFO. REPORTER IN WDB WAS CLEARED TO STAY BEHIND THE LGT BUT CLAIMS THEY COULD NOT COMPLY.

Narrative: CLRED VISUAL 28L TO STAY BEHIND ACR Y LGT FOR 28R. AS WE SLOWED TO APCH SPEED AT ABOUT 2000' WE SAW THE LGT SLOW. AT APCH SPEED WE WERE FASTER THAN LGT. AS WE PASSED THE LGT HE BEGAN TURNING TOWARDS US ON FINAL. I INFORMED CAPT AND HE MOVED TO THE LEFT TO STAY CLEAR. HE THEN TOOK RADIO AND SAID FOR ACR Y TO STAY ON THEIR OWN SIDE. THE PROBLEM WAS TO FOLLOW THE LGT AND WE WERE UNABLE ON SHORT FINAL TO DO SO AND ACR Y LGT CROSSED CENTERLINE INTO OUR AREA ON FINAL.

Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.