A B733 crew, on final to sfo, initiated a go around due to an aircraft being on the runway.

Attributes
ACN	519483
Time
Date	200107
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	agl single value : 100
Aircraft 1
Controlling Facilities	tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : sfo.tower
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	ground : position and hold
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 10000 flight time type : 8000
ASRS Report	519483
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 35 flight time total : 3000 flight time type : 200
ASRS Report	519482
Events
Anomaly	incursion : runway non adherence : required legal separation
Independent Detector	other flight crewa other flight crewb
Consequence	faa : reviewed incident with flight crew other
Supplementary
Problem Areas	ATC Human Performance Airport
Primary Problem	ATC Human Performance

Narrative:

Possible runway incursion runway 28R sfo. At 100 ft noticed small aircraft opposite end of runway. Inquired with tower about go around and did a tower initiated go around. Subsequent approach and landing uneventful. Supplemental information from acn 519482: possible runway incursion. At 100 ft AGL on visual approach to runway 28R, a small aircraft was still on the runway. We inquired with tower about a go around. Aircraft still on runway, initiated a go around about simultaneously with tower directed go around. Go around uneventful and subsequent approach and landing also uneventful.

Original NASA ASRS Text

Title: A B733 CREW, ON FINAL TO SFO, INITIATED A GAR DUE TO AN ACFT BEING ON THE RWY.

Narrative: POSSIBLE RWY INCURSION RWY 28R SFO. AT 100 FT NOTICED SMALL ACFT OPPOSITE END OF RWY. INQUIRED WITH TWR ABOUT GAR AND DID A TWR INITIATED GAR. SUBSEQUENT APCH AND LNDG UNEVENTFUL. SUPPLEMENTAL INFO FROM ACN 519482: POSSIBLE RWY INCURSION. AT 100 FT AGL ON VISUAL APCH TO RWY 28R, A SMALL ACFT WAS STILL ON THE RWY. WE INQUIRED WITH TWR ABOUT A GAR. ACFT STILL ON RWY, INITIATED A GAR ABOUT SIMULTANEOUSLY WITH TWR DIRECTED GAR. GAR UNEVENTFUL AND SUBSEQUENT APCH AND LNDG ALSO UNEVENTFUL.

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.