Less than standard separation occurred between 2 aircraft being vectored to final approach course. TCASII alarm interferes with controller's instructions to turn.

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Attributes
ACN	321693
Time
Date	199511
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mia
State Reference	FL
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	enroute : on vectors
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 : 8000 flight time type : 1500
ASRS Report	321693
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure other anomaly other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	none taken : unable
Consequence	Other
Miss Distance	horizontal : 500 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were on radar vector with mia approach. Our heading was 360 degrees, and we were within 2 mi of the final course for runway 9R. We observed on TCASII an aircraft approaching head-on, 500 ft below us. The TCASII initially went into TA mode, then an RA mode of climb. At that point we saw the target, a DC9, on a south heading about 500 ft below us, off to our left. Due to the volume of the RA we were unable to hear mia approach issue a heading, and approach clearance to runway 9R.

Original NASA ASRS Text

Title: LTSS OCCURRED BTWN 2 ACFT BEING VECTORED TO FINAL APCH COURSE. TCASII ALARM INTERFERES WITH CTLR'S INSTRUCTIONS TO TURN.

Narrative: WE WERE ON RADAR VECTOR WITH MIA APCH. OUR HDG WAS 360 DEGS, AND WE WERE WITHIN 2 MI OF THE FINAL COURSE FOR RWY 9R. WE OBSERVED ON TCASII AN ACFT APCHING HEAD-ON, 500 FT BELOW US. THE TCASII INITIALLY WENT INTO TA MODE, THEN AN RA MODE OF CLB. AT THAT POINT WE SAW THE TARGET, A DC9, ON A S HDG ABOUT 500 FT BELOW US, OFF TO OUR L. DUE TO THE VOLUME OF THE RA WE WERE UNABLE TO HEAR MIA APCH ISSUE A HDG, AND APCH CLRNC TO RWY 9R.

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.