Non reported traffic sighted and evasive action taken.

Attributes
ACN	90748
Time
Date	198807
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zqa
State Reference	FO
Altitude	msl bound lower : 12500 msl bound upper : 12500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute airway : zma
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 1000
ASRS Report	90748
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 6500 flight time type : 1700
ASRS Report	90556
Events
Anomaly	conflict : airborne less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 2000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

This near midair collision event occurred while descending into nassau, bahamas, on BR55V. ZMA cleared our flight to descend from FL230 to cross prune intersection (30 DME NAS VOR) at 10000'. While passing through 12500' the first officer saw an aircraft at our 12 O'clock position, opp direction, on a direct collision course with our flight path. I was hand flying the aircraft at the time and immediately initiated a 30 degree left bank and descent to avoid a collision. The opposing aircraft passed just to our right side with 0' vertical clearance and an estimated 2000' horizontal. An immediate attempt was made to ask ZMA if they were controling the subject aircraft. After as many as 5 attempts, the ZMA controller did advised that he did indeed have the aircraft on radar, VFR at 12500' mode C. He apologized for not advising us of his position and explained that he had been working 2 frequencys and had been preoccupied with other aircraft. Supplemental information from acn 90556: they were working 2 frequencys and had become involved on the other frequency. They had been too busy to inform us of the VFR traffic.

Original NASA ASRS Text

Title: NON REPORTED TRAFFIC SIGHTED AND EVASIVE ACTION TAKEN.

Narrative: THIS NMAC EVENT OCCURRED WHILE DSNDING INTO NASSAU, BAHAMAS, ON BR55V. ZMA CLRED OUR FLT TO DSND FROM FL230 TO CROSS PRUNE INTXN (30 DME NAS VOR) AT 10000'. WHILE PASSING THROUGH 12500' THE F/O SAW AN ACFT AT OUR 12 O'CLOCK POS, OPP DIRECTION, ON A DIRECT COLLISION COURSE WITH OUR FLT PATH. I WAS HAND FLYING THE ACFT AT THE TIME AND IMMEDIATELY INITIATED A 30 DEG LEFT BANK AND DSCNT TO AVOID A COLLISION. THE OPPOSING ACFT PASSED JUST TO OUR RIGHT SIDE WITH 0' VERT CLRNC AND AN ESTIMATED 2000' HORIZ. AN IMMEDIATE ATTEMPT WAS MADE TO ASK ZMA IF THEY WERE CTLING THE SUBJECT ACFT. AFTER AS MANY AS 5 ATTEMPTS, THE ZMA CTLR DID ADVISED THAT HE DID INDEED HAVE THE ACFT ON RADAR, VFR AT 12500' MODE C. HE APOLOGIZED FOR NOT ADVISING US OF HIS POS AND EXPLAINED THAT HE HAD BEEN WORKING 2 FREQS AND HAD BEEN PREOCCUPIED WITH OTHER ACFT. SUPPLEMENTAL INFO FROM ACN 90556: THEY WERE WORKING 2 FREQS AND HAD BECOME INVOLVED ON THE OTHER FREQ. THEY HAD BEEN TOO BUSY TO INFORM US OF THE VFR TFC.

Data retrieved from NASA's ASRS site as of August 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.