B777 considers evasive maneuver observing an air carrier turn in front while aligning at sfo.

Attributes
ACN	511803
Time
Date	200105
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : brijj
State Reference	CA
Altitude	msl single value : 2000
Aircraft 1
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time type : 1039
ASRS Report	511803
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical non adherence : published procedure non adherence : required legal separation other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Consequence	other
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance Airspace Structure Airport
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X on high diagonal to runway 28R. Since ATC did not inform air carrier xx, when air carrier xx had visual air carrier X, air carrier xx believed that air carrier X on final for oak. Shortly afterwards, air carrier X did large s-turns while paralleling runway 28R. When air carrier xx finally realized air carrier X intended to land at sfo, air carrier X darted across air carrier xx's flight path approximately 2 NM from our nose. Still no ATC advisories. As I prepared to go around, ATC cleared air carrier X to land on runway 28L. I then elected to land and do so on runway 28R.

Original NASA ASRS Text

Title: B777 CONSIDERS EVASIVE MANEUVER OBSERVING AN ACR TURN IN FRONT WHILE ALIGNING AT SFO.

Narrative: ACR X ON HIGH DIAGONAL TO RWY 28R. SINCE ATC DID NOT INFORM ACR XX, WHEN ACR XX HAD VISUAL ACR X, ACR XX BELIEVED THAT ACR X ON FINAL FOR OAK. SHORTLY AFTERWARDS, ACR X DID LARGE S-TURNS WHILE PARALLELING RWY 28R. WHEN ACR XX FINALLY REALIZED ACR X INTENDED TO LAND AT SFO, ACR X DARTED ACROSS ACR XX'S FLT PATH APPROX 2 NM FROM OUR NOSE. STILL NO ATC ADVISORIES. AS I PREPARED TO GO AROUND, ATC CLRED ACR X TO LAND ON RWY 28L. I THEN ELECTED TO LAND AND DO SO ON RWY 28R.

Data retrieved from NASA's ASRS site as of July 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.