Narrative:

At FL350, en route den to tus, approximately 115 NM from san simon VOR on the 348 degree right, 'cleared direct,' abq ATC (frequency 135.8 MHZ) called 'large transport X, descend immediately to FL330!' I began descent, retarding thrust levers to idle and using speed brakes as expeditiously as possible with the seat belt sign off and passenger (3 first class, 72 coach and 3 children) and F/a's about, descended to FL330 in about 40-45 seconds. Wbound aircraft medium large transport Y visually acquired at about 10 mi, seen to pass above us slightly behind (estimated 2000') our vertical view. Controller declined filing report, stating had more than 5 mi radar sep at time standard vertical 2000' sep attained. Collision course noted by controller (whether visual radar or computer alerted, unknown). Crew response trusting and immediate, with position of traffic conflict requested. Sufficiently smooth that passenger seemed unaware of dangerous potential. Need collision avoidance warning system as soon as possible! Supplemental information from acn 90420: we complied instantly by retarding throttle and deploying speed brakes. I reported out of FL350, 345, 339 and 335, as well as FL220. Medium large transport Y crossed behind us left to right at 35000'. Controller advised us on 135.8 that he was not working the sector for the medium large transport Y.

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Original NASA ASRS Text

Title: LGT GIVEN AN IMMEDIATE DESCENT FOR MLG TRAFFIC. ACFT UNDER SEPARATE ATC JURISDICTION.

Narrative: AT FL350, ENRTE DEN TO TUS, APPROX 115 NM FROM SAN SIMON VOR ON THE 348 DEG R, 'CLRED DIRECT,' ABQ ATC (FREQ 135.8 MHZ) CALLED 'LGT X, DSND IMMEDIATELY TO FL330!' I BEGAN DSCNT, RETARDING THRUST LEVERS TO IDLE AND USING SPD BRAKES AS EXPEDITIOUSLY AS POSSIBLE WITH THE SEAT BELT SIGN OFF AND PAX (3 FIRST CLASS, 72 COACH AND 3 CHILDREN) AND F/A'S ABOUT, DSNDED TO FL330 IN ABOUT 40-45 SECS. WBOUND ACFT MLG Y VISUALLY ACQUIRED AT ABOUT 10 MI, SEEN TO PASS ABOVE US SLIGHTLY BEHIND (ESTIMATED 2000') OUR VERT VIEW. CTLR DECLINED FILING RPT, STATING HAD MORE THAN 5 MI RADAR SEP AT TIME STANDARD VERT 2000' SEP ATTAINED. COLLISION COURSE NOTED BY CTLR (WHETHER VISUAL RADAR OR COMPUTER ALERTED, UNKNOWN). CREW RESPONSE TRUSTING AND IMMEDIATE, WITH POS OF TFC CONFLICT REQUESTED. SUFFICIENTLY SMOOTH THAT PAX SEEMED UNAWARE OF DANGEROUS POTENTIAL. NEED COLLISION AVOIDANCE WARNING SYS ASAP! SUPPLEMENTAL INFO FROM ACN 90420: WE COMPLIED INSTANTLY BY RETARDING THROTTLE AND DEPLOYING SPD BRAKES. I RPTED OUT OF FL350, 345, 339 AND 335, AS WELL AS FL220. MLG Y CROSSED BEHIND US LEFT TO RIGHT AT 35000'. CTLR ADVISED US ON 135.8 THAT HE WAS NOT WORKING THE SECTOR FOR THE MLG Y.

Data retrieved from NASA's ASRS site as of August 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.