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B737 in merida airspace, mmid ARTCC, questions ATC regarding descent clearance and probable similar call sign error.
| Attributes | |
| ACN | 602703 |
| Time | |
| Date | 200312 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mmid.artcc |
| State Reference | FO |
| Altitude | msl bound lower : 35000 msl bound upper : 37000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : mmid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : mmid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 602703 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : separated traffic controller : issued new clearance other |
| Miss Distance | vertical : 2000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Merida center called us air carrier Y and told us to descend immediately to FL350 from FL370. After a second call to air carrier Y, we asked if he meant air carrier X. He said yes, and asked us to immediately descend to FL350 from FL370 and turn left 30 degrees. We then noticed an opposite direction aircraft at our altitude closing on us. We never got a TA or RA and never got within about 10 mi of the traffic.
Original NASA ASRS Text
Title: B737 IN MERIDA AIRSPACE, MMID ARTCC, QUESTIONS ATC REGARDING DSCNT CLRNC AND PROBABLE SIMILAR CALL SIGN ERROR.
Narrative: MERIDA CTR CALLED US ACR Y AND TOLD US TO DSND IMMEDIATELY TO FL350 FROM FL370. AFTER A SECOND CALL TO ACR Y, WE ASKED IF HE MEANT ACR X. HE SAID YES, AND ASKED US TO IMMEDIATELY DSND TO FL350 FROM FL370 AND TURN L 30 DEGS. WE THEN NOTICED AN OPPOSITE DIRECTION ACFT AT OUR ALT CLOSING ON US. WE NEVER GOT A TA OR RA AND NEVER GOT WITHIN ABOUT 10 MI OF THE TFC.
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.