Light transport had near midair collision with another aircraft in mia TCA.

Attributes
ACN	143775
Time
Date	199004
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mia
State Reference	FL
Altitude	msl bound lower : 3000 msl bound upper : 3200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 80 flight time total : 2500 flight time type : 80
ASRS Report	143775
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 250 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were level at 3000' inbound to mia's 9R. We were assigned a heading of 360. Were then told about traffic, an mdt, at 1 O'clock, that we were going to follow to 9R. My first officer was flying and I was looking out for the traffic. We were approximately 10-12 mi southwest of the airport. When I saw traffic at about our 1-1:30 position at first I thought he was the traffic we were to follow. After watching him for a while he was heading nwbnd and appeared to be slightly higher than us. He wasn't changing altitude or heading. We were getting a little too close and told my first officer to turn left and descend. When we had crossed paths he was about 100' higher and about 200-300' behind us. At that time we had deviated 20 degree left and about 200' down. I tried to ask about the traffic to mia approach, but kept getting stepped on. Finally able to get through. I told the controller about the traffic. The controller said he had just popped up and was indicating an altitude of 3200' and asked if that looked accurate. I had told him that he had just passed behind us and above us by 100'.

Original NASA ASRS Text

Title: LTT HAD NMAC WITH ANOTHER ACFT IN MIA TCA.

Narrative: WE WERE LEVEL AT 3000' INBND TO MIA'S 9R. WE WERE ASSIGNED A HDG OF 360. WERE THEN TOLD ABOUT TFC, AN MDT, AT 1 O'CLOCK, THAT WE WERE GOING TO FOLLOW TO 9R. MY F/O WAS FLYING AND I WAS LOOKING OUT FOR THE TFC. WE WERE APPROX 10-12 MI SW OF THE ARPT. WHEN I SAW TFC AT ABOUT OUR 1-1:30 POSITION AT FIRST I THOUGHT HE WAS THE TFC WE WERE TO FOLLOW. AFTER WATCHING HIM FOR A WHILE HE WAS HDG NWBND AND APPEARED TO BE SLIGHTLY HIGHER THAN US. HE WASN'T CHANGING ALT OR HDG. WE WERE GETTING A LITTLE TOO CLOSE AND TOLD MY F/O TO TURN LEFT AND DSND. WHEN WE HAD CROSSED PATHS HE WAS ABOUT 100' HIGHER AND ABOUT 200-300' BEHIND US. AT THAT TIME WE HAD DEVIATED 20 DEG LEFT AND ABOUT 200' DOWN. I TRIED TO ASK ABOUT THE TFC TO MIA APCH, BUT KEPT GETTING STEPPED ON. FINALLY ABLE TO GET THROUGH. I TOLD THE CTLR ABOUT THE TFC. THE CTLR SAID HE HAD JUST POPPED UP AND WAS INDICATING AN ALT OF 3200' AND ASKED IF THAT LOOKED ACCURATE. I HAD TOLD HIM THAT HE HAD JUST PASSED BEHIND US AND ABOVE US BY 100'.

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.