Air carrier has near midair collision with small aircraft on vectors to approach.

Attributes
ACN	191573
Time
Date	199110
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mia
State Reference	FL
Altitude	msl bound lower : 9800 msl bound upper : 10400
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other descent other
Route In Use	enroute : on vectors enroute airway : zma
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : private pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3500 flight time type : 700
ASRS Report	191523
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 20000 flight time type : 500
ASRS Report	191340
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 200 vertical : 500
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation other

Narrative:

In descent to miami during radar vectors at 10000 ft mia center called traffic 12 O'clock and 9000 ft. I called 'TCASII contact'. Traffic showed climbing and TCASII called 'traffic, traffic'. TCASII showed decreasing separation -900 ft/- 800 ft. At -400 ft captain began climb. I spotted traffic and called it at same time TCASII called 'climb, climb'. Traffic passed below and to our left. As captain returned to 10000 ft (from 10400 ft) autoplt remained off as we sorted out the situation and we descended through 9800 ft before correcting to 10000 ft again. Controller helped by calling traffic early and TCASII worked. Recommend vigilance in confirming autoplt on after evasive action.

Original NASA ASRS Text

Title: ACR HAS NMAC WITH SMA ON VECTORS TO APCH.

Narrative: IN DSCNT TO MIAMI DURING RADAR VECTORS AT 10000 FT MIA CENTER CALLED TFC 12 O'CLOCK AND 9000 FT. I CALLED 'TCASII CONTACT'. TFC SHOWED CLBING AND TCASII CALLED 'TFC, TFC'. TCASII SHOWED DECREASING SEPARATION -900 FT/- 800 FT. AT -400 FT CAPT BEGAN CLB. I SPOTTED TFC AND CALLED IT AT SAME TIME TCASII CALLED 'CLB, CLB'. TFC PASSED BELOW AND TO OUR L. AS CAPT RETURNED TO 10000 FT (FROM 10400 FT) AUTOPLT REMAINED OFF AS WE SORTED OUT THE SITUATION AND WE DSNDED THROUGH 9800 FT BEFORE CORRECTING TO 10000 FT AGAIN. CTLR HELPED BY CALLING TFC EARLY AND TCASII WORKED. RECOMMEND VIGILANCE IN CONFIRMING AUTOPLT ON AFTER EVASIVE ACTION.

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.