Narrative:

Location: esv VOR. Over esp at FL350 at XY10Z, TCASII issued 'traffic, traffic.' a yellow target was displayed at the 3:30 O'clock position, 1-2 mi. Almost immediately a descend RA initiated. We followed the descend RA, approximately 1500 FPM. We acquired a visual on an air carrier B757 at the TCASII location. I initiated a radio call that we were responding to a TCASII RA and descending from FL350. Air carrier acknowledged the radio call and stated that they had a visual on us. Guayaquil control then directed us to descend to FL310. We established contact with B757 on frequency 130.55, sharing flight information. B757 had departed lima on UG437 at FL350. We were flying UW7 from mnv to esv at FL350. FL350 had been issued to us by clearance delivery on the ground at gye. We passed mnv at XX53 at FL350, estimating esv at XY10. This was reported to gye. At no time was any traffic information passed to us. The WX at the time was cirrus clouds with marginal visibility. We estimate our closest approach to the B757 was 1-2 mi. Supplemental information from acn 466137: approaching esmeraldas VOR ecuadorian coastline we had a TA, then a descend RA on UW7 approaching esmeraldas VOR where we intersect UG437. Flight lim-atl was already on UG437. We were both at our cleared assigned altitudes, FL350, essentially arriving at esv at the same time. We could see traffic off our r-hand side. TCASII worked fine. We descended to FL310 at the direction of gye controller after we told him of our descent already in progress. I am sure we were cleared to FL350, and captain reported so at our position.

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Original NASA ASRS Text

Title: A B757 FLT ENCOUNTERS ANOTHER B757 AT THE INTXN OF 2 AIRWAYS AT FL350 OVER THE ESV VOR ON FREQ WITH SEGU, FO.

Narrative: LOCATION: ESV VOR. OVER ESP AT FL350 AT XY10Z, TCASII ISSUED 'TFC, TFC.' A YELLOW TARGET WAS DISPLAYED AT THE 3:30 O'CLOCK POS, 1-2 MI. ALMOST IMMEDIATELY A DSND RA INITIATED. WE FOLLOWED THE DSND RA, APPROX 1500 FPM. WE ACQUIRED A VISUAL ON AN ACR B757 AT THE TCASII LOCATION. I INITIATED A RADIO CALL THAT WE WERE RESPONDING TO A TCASII RA AND DSNDING FROM FL350. ACR ACKNOWLEDGED THE RADIO CALL AND STATED THAT THEY HAD A VISUAL ON US. GUAYAQUIL CTL THEN DIRECTED US TO DSND TO FL310. WE ESTABLISHED CONTACT WITH B757 ON FREQ 130.55, SHARING FLT INFO. B757 HAD DEPARTED LIMA ON UG437 AT FL350. WE WERE FLYING UW7 FROM MNV TO ESV AT FL350. FL350 HAD BEEN ISSUED TO US BY CLRNC DELIVERY ON THE GND AT GYE. WE PASSED MNV AT XX53 AT FL350, ESTIMATING ESV AT XY10. THIS WAS RPTED TO GYE. AT NO TIME WAS ANY TFC INFO PASSED TO US. THE WX AT THE TIME WAS CIRRUS CLOUDS WITH MARGINAL VISIBILITY. WE ESTIMATE OUR CLOSEST APCH TO THE B757 WAS 1-2 MI. SUPPLEMENTAL INFO FROM ACN 466137: APCHING ESMERALDAS VOR ECUADORIAN COASTLINE WE HAD A TA, THEN A DSND RA ON UW7 APCHING ESMERALDAS VOR WHERE WE INTERSECT UG437. FLT LIM-ATL WAS ALREADY ON UG437. WE WERE BOTH AT OUR CLRED ASSIGNED ALTS, FL350, ESSENTIALLY ARRIVING AT ESV AT THE SAME TIME. WE COULD SEE TRAFFIC OFF OUR R-HAND SIDE. TCASII WORKED FINE. WE DSNDED TO FL310 AT THE DIRECTION OF GYE CTLR AFTER WE TOLD HIM OF OUR DSCNT ALREADY IN PROGRESS. I AM SURE WE WERE CLRED TO FL350, AND CAPT RPTED SO AT OUR POS.

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.