Narrative:

In the vicinity of maxim intersection, havana center called us and in unusually bad english told us to turn left to a heading of 150 degrees (course was approximately 240 degrees). No 'immediate' call or other indication of concern evident. Some initial confusion as to call from havana because of poor english. Started left turn to requested heading when I noted a pop-up TCASII target at 12 O'clock position, 7 mi, co-altitude. Almost immediately, we got a TA. This target was never called out to us by havana. Within 10 seconds, while in the turn, now a bit more aggressive, we received an RA with a climb call. Complied with RA and notified havana. As target closed to within a mi or so, we finally saw it begin to descend on the TCASII. Although we never actually saw the target (clear skies), I estimate we passed within 1/4 mi horizontally (our right side) and 600 ft vertically (based on TCASII information). Havana center was very reluctant to provide us any information about the incident, but we finally were told it was a honduran registered citation 5 who was descending to FL330. Havana gave no feedback as to why this occurred and, to be honest, never seemed concerned. At no time did they point out that aircraft. In additional, although I was not specifically scanning the navigation display at the time, neither of us noted a TCASII target at all until we began the turn.

Related reports:

Google
 

Original NASA ASRS Text

Title: B737 RESPONDS TO TCASII RA WITH C550 TFC IN HAVANA ARTCC RADAR AIRSPACE.

Narrative: IN THE VICINITY OF MAXIM INTXN, HAVANA CTR CALLED US AND IN UNUSUALLY BAD ENGLISH TOLD US TO TURN L TO A HDG OF 150 DEGS (COURSE WAS APPROX 240 DEGS). NO 'IMMEDIATE' CALL OR OTHER INDICATION OF CONCERN EVIDENT. SOME INITIAL CONFUSION AS TO CALL FROM HAVANA BECAUSE OF POOR ENGLISH. STARTED L TURN TO REQUESTED HDG WHEN I NOTED A POP-UP TCASII TARGET AT 12 O'CLOCK POS, 7 MI, CO-ALT. ALMOST IMMEDIATELY, WE GOT A TA. THIS TARGET WAS NEVER CALLED OUT TO US BY HAVANA. WITHIN 10 SECONDS, WHILE IN THE TURN, NOW A BIT MORE AGGRESSIVE, WE RECEIVED AN RA WITH A CLB CALL. COMPLIED WITH RA AND NOTIFIED HAVANA. AS TARGET CLOSED TO WITHIN A MI OR SO, WE FINALLY SAW IT BEGIN TO DSND ON THE TCASII. ALTHOUGH WE NEVER ACTUALLY SAW THE TARGET (CLR SKIES), I ESTIMATE WE PASSED WITHIN 1/4 MI HORIZLY (OUR R SIDE) AND 600 FT VERTLY (BASED ON TCASII INFO). HAVANA CTR WAS VERY RELUCTANT TO PROVIDE US ANY INFO ABOUT THE INCIDENT, BUT WE FINALLY WERE TOLD IT WAS A HONDURAN REGISTERED CITATION 5 WHO WAS DSNDING TO FL330. HAVANA GAVE NO FEEDBACK AS TO WHY THIS OCCURRED AND, TO BE HONEST, NEVER SEEMED CONCERNED. AT NO TIME DID THEY POINT OUT THAT ACFT. IN ADDITIONAL, ALTHOUGH I WAS NOT SPECIFICALLY SCANNING THE NAV DISPLAY AT THE TIME, NEITHER OF US NOTED A TCASII TARGET AT ALL UNTIL WE BEGAN THE TURN.

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.