A319 flight crew southwest bound on B879 and descending through FL340 reports TCAS RA with opposite direction traffic. TCAS commands are followed with 500 feet of separation.

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Attributes
ACN	756272
Time
Date	200709
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : muha.airport
State Reference	FO
Altitude	msl single value : 34000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : muha.artcc
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : muha.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : enroute altitude change
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 165 flight time total : 10000 flight time type : 1400
ASRS Report	756272
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance
Independent Detector	aircraft equipment : tcas
Resolutory Action	flight crew : took precautionary avoidance action
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

We were given pilot discretion from FL380 to FL240. I had first officer call havana center to tell controller we were leaving FL380 to FL240. The controller acknowledged the clearance. I noticed on TCAS a target heading in our direction at a lower altitude. I stop our descent. I believe the other aircraft was climbing. I started to climb. During the climb we received an RA.

Original NASA ASRS Text

Title: A319 FLT CREW SW BOUND ON B879 AND DESCENDING THROUGH FL340 REPORTS TCAS RA WITH OPPOSITE DIRECTION TRAFFIC. TCAS COMMANDS ARE FOLLOWED WITH 500 FEET OF SEPARATION.

Narrative: WE WERE GIVEN PLT DISCRETION FROM FL380 TO FL240. I HAD FO CALL HAVANA CTR TO TELL CTLR WE WERE LEAVING FL380 TO FL240. THE CTLR ACKNOWLEDGED THE CLRNC. I NOTICED ON TCAS A TARGET HEADING IN OUR DIRECTION AT A LOWER ALT. I STOP OUR DSCNT. I BELIEVE THE OTHER ACFT WAS CLBING. I STARTED TO CLB. DURING THE CLB WE RECEIVED AN RA.

Data retrieved from NASA's ASRS site as of January 2009 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.