Traffic conflict in the nassau area between 2 aircraft on different frequencys controled by different agencies. TCASII provided resolution of conflict.

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Attributes
ACN	496050
Time
Date	200012
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : nas.vor
State Reference	FO
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : myna.tracon tower : hnl.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : vacating altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zma.artcc
Operator	general aviation : corporate
Make Model Name	Small Transport
Operating Under FAR Part	Part 91
Flight Phase	cruise : level descent : intermediate altitude
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 22000 flight time type : 13000
ASRS Report	496050
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	conflict : airborne critical
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 3000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Inter Facility Coordination Failure Operational Error

Narrative:

Climbing out of NAS, cleared to 12000 ft, heading 310 degrees. TCASII alert 'reduce climb.' target initially level at 11000 ft, then initiated descent. At range 3 mi, 1 O'clock position, first officer acquired target visually while initiating leveloff. White twin passed within 1 mi right, at approximately our altitude. Notified nassau departure of the incident. They responded 'roger.' no indication they knew the aircraft was there. Upon switching to ZMA, we overheard another aircraft advising center that they had just had an encounter with a large aircraft. They advised ZMA that they were astonished at what they saw. Given the fact that we were on different frequencys, under control of the 2 different agencies, it appears that they had a breakdown in communication.

Original NASA ASRS Text

Title: TFC CONFLICT IN THE NASSAU AREA BTWN 2 ACFT ON DIFFERENT FREQS CTLED BY DIFFERENT AGENCIES. TCASII PROVIDED RESOLUTION OF CONFLICT.

Narrative: CLBING OUT OF NAS, CLRED TO 12000 FT, HDG 310 DEGS. TCASII ALERT 'REDUCE CLB.' TARGET INITIALLY LEVEL AT 11000 FT, THEN INITIATED DSCNT. AT RANGE 3 MI, 1 O'CLOCK POS, FO ACQUIRED TARGET VISUALLY WHILE INITIATING LEVELOFF. WHITE TWIN PASSED WITHIN 1 MI R, AT APPROX OUR ALT. NOTIFIED NASSAU DEP OF THE INCIDENT. THEY RESPONDED 'ROGER.' NO INDICATION THEY KNEW THE ACFT WAS THERE. UPON SWITCHING TO ZMA, WE OVERHEARD ANOTHER ACFT ADVISING CTR THAT THEY HAD JUST HAD AN ENCOUNTER WITH A LARGE ACFT. THEY ADVISED ZMA THAT THEY WERE ASTONISHED AT WHAT THEY SAW. GIVEN THE FACT THAT WE WERE ON DIFFERENT FREQS, UNDER CTL OF THE 2 DIFFERENT AGENCIES, IT APPEARS THAT THEY HAD A BREAKDOWN IN COM.

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.