Air carrier widebody transport on visual approach to runway 23L at sfo passes large transport that it was instructed to follow due to higher approach speed. Large transport drifted left as widebody transport passed causing widebody transport captain to deviate left and warn large transport pilot to move over on the radio.

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Attributes
ACN	127649
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	tracon : oak tower : sfo
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
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
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 120 flight time total : 8000 flight time type : 500
ASRS Report	127649
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Visual 28L sfo ATC clearance to follow large transport going to 28R. At bug speed after going to sfo tower captain was unable to follow large transport aircraft going to 28R. Passed large transport at inside outer marker. At that time the large transport started to move left of 28R centerline. Captain picked up microphone and said, get your ass over large transport. He did. Our web approach speed was faster because of our weight. We moved to our left of centerline until large transport moved to his centerline. Had normal approach and landing.

Original NASA ASRS Text

Title: ACR WDB ON VISUAL APCH TO RWY 23L AT SFO PASSES LGT THAT IT WAS INSTRUCTED TO FOLLOW DUE TO HIGHER APCH SPEED. LGT DRIFTED LEFT AS WDB PASSED CAUSING WDB CAPT TO DEVIATE LEFT AND WARN LGT PLT TO MOVE OVER ON THE RADIO.

Narrative: VISUAL 28L SFO ATC CLRNC TO FOLLOW LGT GOING TO 28R. AT BUG SPEED AFTER GOING TO SFO TWR CAPT WAS UNABLE TO FOLLOW LGT ACFT GOING TO 28R. PASSED LGT AT INSIDE OUTER MARKER. AT THAT TIME THE LGT STARTED TO MOVE LEFT OF 28R CENTERLINE. CAPT PICKED UP MICROPHONE AND SAID, GET YOUR ASS OVER LGT. HE DID. OUR WEB APCH SPEED WAS FASTER BECAUSE OF OUR WEIGHT. WE MOVED TO OUR LEFT OF CENTERLINE UNTIL LGT MOVED TO HIS CENTERLINE. HAD NORMAL APCH AND LNDG.

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.