Narrative:

The captain was resting in the back. The first officer and I (the international relief officer) were on the flight deck. After passing lixas intersection at XA34Z northbound on UG436 at FL310, we checked in for initial contact with cenamer radio on HF 10.024. During the standard position report we requested FL350. We were told to stand by. Within 2 mins, cenamer radio called and told us, 'cenamer control clears flight to FL350, report leaving FL310 for FL350.' we reported climbing and initiated the VNAV climb. While passing FL327, cenamer radio asked us to report our altitude climbing through. As we climbed through FL335, cenamer radio again asked our altitude and advised we had traffic sbound at 12 O'clock position at FL330. Visual contact was made immediately and maintained. Through approximately FL337 we received a traffic alert at XA42Z with instructions to climb and increase climb. We responded by following the flight director and increasing climb rate to 1600 FPM. The traffic passed 1600 ft below us at FL330.

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Original NASA ASRS Text

Title: POTENTIAL CONFLICT. A B737-800 FLT CLBS THROUGH OCCUPIED ALT, OPPOSITE DIRECTION TFC ON A CLRNC FROM A NON RADAR FACILITY IN PANAMA NEAR LIXAS INTXN, FO.

Narrative: THE CAPT WAS RESTING IN THE BACK. THE FO AND I (THE IRO) WERE ON THE FLT DECK. AFTER PASSING LIXAS INTXN AT XA34Z NBOUND ON UG436 AT FL310, WE CHKED IN FOR INITIAL CONTACT WITH CENAMER RADIO ON HF 10.024. DURING THE STANDARD POS RPT WE REQUESTED FL350. WE WERE TOLD TO STAND BY. WITHIN 2 MINS, CENAMER RADIO CALLED AND TOLD US, 'CENAMER CTL CLRS FLT TO FL350, RPT LEAVING FL310 FOR FL350.' WE RPTED CLBING AND INITIATED THE VNAV CLB. WHILE PASSING FL327, CENAMER RADIO ASKED US TO RPT OUR ALT CLBING THROUGH. AS WE CLBED THROUGH FL335, CENAMER RADIO AGAIN ASKED OUR ALT AND ADVISED WE HAD TFC SBOUND AT 12 O'CLOCK POS AT FL330. VISUAL CONTACT WAS MADE IMMEDIATELY AND MAINTAINED. THROUGH APPROX FL337 WE RECEIVED A TFC ALERT AT XA42Z WITH INSTRUCTIONS TO CLB AND INCREASE CLB. WE RESPONDED BY FOLLOWING THE FLT DIRECTOR AND INCREASING CLB RATE TO 1600 FPM. THE TFC PASSED 1600 FT BELOW US AT FL330.

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.