L1011 unable to stay behind B737 landing on parallel runway at sfo.

Attributes
ACN	404322
Time
Date	199806
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 0 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : o09
Operator	common carrier : air carrier
Make Model Name	L-1011 Tri-Star All Series
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach landing other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 160 flight time total : 8100 flight time type : 250
ASRS Report	404322
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified
Airport	procedure or policy : unspecified

Narrative:

Flight was vectored to intercept sfo 095 degree radial for runway 28R. After intercept, approach gave a heading to the left 10 degrees to intercept runway 28L localizer. After localizer capture, approach gave us another turn to the left of course. A B737 was simultaneously being vectored on an approach to runway 28R. After verifying we had the field in sight, approach asked us to call the B737 in sight. After a second query and asking for the traffic's position, we called the B737 in sight (2 O'clock high) descending out of a broken layer of clouds. We were then immediately cleared for a visual approach to runway 28L to follow the B737 landing on runway 28R. Our minimum approach speed was 141 KTS and we were at approximately 141 KTS when we called the B737 in sight. Because of the B737's slower approach speed, we gradually became a wingtip-to-wingtip approach on very short final.

Original NASA ASRS Text

Title: L1011 UNABLE TO STAY BEHIND B737 LNDG ON PARALLEL RWY AT SFO.

Narrative: FLT WAS VECTORED TO INTERCEPT SFO 095 DEG RADIAL FOR RWY 28R. AFTER INTERCEPT, APCH GAVE A HDG TO THE L 10 DEGS TO INTERCEPT RWY 28L LOC. AFTER LOC CAPTURE, APCH GAVE US ANOTHER TURN TO THE L OF COURSE. A B737 WAS SIMULTANEOUSLY BEING VECTORED ON AN APCH TO RWY 28R. AFTER VERIFYING WE HAD THE FIELD IN SIGHT, APCH ASKED US TO CALL THE B737 IN SIGHT. AFTER A SECOND QUERY AND ASKING FOR THE TFC'S POS, WE CALLED THE B737 IN SIGHT (2 O'CLOCK HIGH) DSNDING OUT OF A BROKEN LAYER OF CLOUDS. WE WERE THEN IMMEDIATELY CLRED FOR A VISUAL APCH TO RWY 28L TO FOLLOW THE B737 LNDG ON RWY 28R. OUR MINIMUM APCH SPD WAS 141 KTS AND WE WERE AT APPROX 141 KTS WHEN WE CALLED THE B737 IN SIGHT. BECAUSE OF THE B737'S SLOWER APCH SPD, WE GRADUALLY BECAME A WINGTIP-TO-WINGTIP APCH ON VERY SHORT FINAL.

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.