B727 initiates TCASII maneuver when overshooting runway 34L due to S56 vector spacing and wind conditions placing the B727 into conflict with MD90 on approach to runway 34R at slc.

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Attributes
ACN	539969
Time
Date	200203
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : slc.airport
State Reference	UT
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : s56.tracon
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : s46.tracon
Operator	common carrier : air carrier
Make Model Name	MD-90 Series (DC-9-90) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 5000
ASRS Report	539969
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical inflight encounter : weather inflight encounter other non adherence : required legal separation non adherence : clearance other anomaly other spatial deviation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 1600 vertical : 500
Supplementary
Problem Areas	ATC Human Performance Weather
Primary Problem	ATC Human Performance

Narrative:

We had flown the published 155 degree heading on downwind leg of the arrival for an expected visual approach to runway 34L. Pattern altitude winds were apparently strong from the west, since the controller gave us 3 different heading corrections on downwind. He called our traffic to follow, issued a turn to base leg and our clearance for the visual approach to runway 34L. 1/2 way through the turn, the controller advised us of traffic (the MD90) on final for the left and instructed us to 'maintain visual separation.' (the MD90 was above us and behind us and apparently closing.) this we attempted to do in spite of the fact that we were going to overshoot our assigned runway 34L centerline. We got a TCASII RA and responded accordingly. We were on a different approach control frequency and were not aware of clrncs issued to the MD90. In short, the approach controller 'flew us into a box,' at which point the TCASII RA was inevitable.

Original NASA ASRS Text

Title: B727 INITIATES TCASII MANEUVER WHEN OVERSHOOTING RWY 34L DUE TO S56 VECTOR SPACING AND WIND CONDITIONS PLACING THE B727 INTO CONFLICT WITH MD90 ON APCH TO RWY 34R AT SLC.

Narrative: WE HAD FLOWN THE PUBLISHED 155 DEG HDG ON DOWNWIND LEG OF THE ARR FOR AN EXPECTED VISUAL APCH TO RWY 34L. PATTERN ALT WINDS WERE APPARENTLY STRONG FROM THE W, SINCE THE CTLR GAVE US 3 DIFFERENT HDG CORRECTIONS ON DOWNWIND. HE CALLED OUR TFC TO FOLLOW, ISSUED A TURN TO BASE LEG AND OUR CLRNC FOR THE VISUAL APCH TO RWY 34L. 1/2 WAY THROUGH THE TURN, THE CTLR ADVISED US OF TFC (THE MD90) ON FINAL FOR THE L AND INSTRUCTED US TO 'MAINTAIN VISUAL SEPARATION.' (THE MD90 WAS ABOVE US AND BEHIND US AND APPARENTLY CLOSING.) THIS WE ATTEMPTED TO DO IN SPITE OF THE FACT THAT WE WERE GOING TO OVERSHOOT OUR ASSIGNED RWY 34L CTRLINE. WE GOT A TCASII RA AND RESPONDED ACCORDINGLY. WE WERE ON A DIFFERENT APCH CTL FREQ AND WERE NOT AWARE OF CLRNCS ISSUED TO THE MD90. IN SHORT, THE APCH CTLR 'FLEW US INTO A BOX,' AT WHICH POINT THE TCASII RA WAS INEVITABLE.

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.