B767 flight crew descended in response to a TCASII RA and subsequently instructed by approach controller to turn to avoid traffic when the crew advised ATC of their response to TCASII.

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Attributes
ACN	545295
Time
Date	200204
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	msl bound lower : 6200 msl bound upper : 7000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 28r other
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 2543
ASRS Report	545295
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical inflight encounter : weather non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action other
Consequence	other
Miss Distance	horizontal : 3000 vertical : 300
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

While being vectored to join the localizer for runway 28R at sfo, level at 7000 ft, a plane appeared on TCASII climbing at us from below. It continued through about 6200 ft when the TCASII commanded us to descend. I began the descent through the intruder's altitude. As the TCASII started to command the descent, ATC contacted us with a routine radio call. The captain advised ATC we were responding to an RA. ATC then also saw the conflict and issued us a right turn away from the other plane. I started a right turn as we were descending. When the TCASII stopped commanding the descent, we were at 6500 ft and on a northwest heading. ATC then gave us a climb back to 7000 ft and a heading to join the localizer. I am not sure how close we were to the other plane, but estimate it was 1/2 - 2 mi. We were solid IMC and never saw the other plane. The other plane was climbing rapidly, so it was probably turbine pwred. Either ATC or the other plane was in error, I don't know which.

Original NASA ASRS Text

Title: B767 FLC DSNDED IN RESPONSE TO A TCASII RA AND SUBSEQUENTLY INSTRUCTED BY APCH CTLR TO TURN TO AVOID TFC WHEN THE CREW ADVISED ATC OF THEIR RESPONSE TO TCASII.

Narrative: WHILE BEING VECTORED TO JOIN THE LOC FOR RWY 28R AT SFO, LEVEL AT 7000 FT, A PLANE APPEARED ON TCASII CLBING AT US FROM BELOW. IT CONTINUED THROUGH ABOUT 6200 FT WHEN THE TCASII COMMANDED US TO DSND. I BEGAN THE DSCNT THROUGH THE INTRUDER'S ALT. AS THE TCASII STARTED TO COMMAND THE DSCNT, ATC CONTACTED US WITH A ROUTINE RADIO CALL. THE CAPT ADVISED ATC WE WERE RESPONDING TO AN RA. ATC THEN ALSO SAW THE CONFLICT AND ISSUED US A R TURN AWAY FROM THE OTHER PLANE. I STARTED A R TURN AS WE WERE DSNDING. WHEN THE TCASII STOPPED COMMANDING THE DSCNT, WE WERE AT 6500 FT AND ON A NW HDG. ATC THEN GAVE US A CLB BACK TO 7000 FT AND A HDG TO JOIN THE LOC. I AM NOT SURE HOW CLOSE WE WERE TO THE OTHER PLANE, BUT ESTIMATE IT WAS 1/2 - 2 MI. WE WERE SOLID IMC AND NEVER SAW THE OTHER PLANE. THE OTHER PLANE WAS CLBING RAPIDLY, SO IT WAS PROBABLY TURBINE PWRED. EITHER ATC OR THE OTHER PLANE WAS IN ERROR, I DON'T KNOW WHICH.

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.