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Foreign ARTCC quickly descended another aircraft underneath an large transport air carrier aircraft in high altitude cruise resulting in less than standard separation.
| Attributes | |
| ACN | 247784 |
| Time | |
| Date | 199307 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cvm |
| State Reference | FO |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : mmty |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 21800 flight time type : 1000 |
| ASRS Report | 247784 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Houston handed us off to mty center. Upon establishing radio contact with mty center was confirmed radar contact at FL310. At approximately xxyz, FL310 on the cvm 001 degree right/85 DME out of FL310 for 200. When visually acquiring the aircraft, it was passing left to right on a collision course and crossed directly under us less than 1000 ft. No call was made to us. When we asked mty center about the events, the only thing said was that the aircraft was descending from FL310 to 200. No further action was taken.
Original NASA ASRS Text
Title: FOREIGN ARTCC QUICKLY DSNDED ANOTHER ACFT UNDERNEATH AN LGT ACR ACFT IN HIGH ALT CRUISE RESULTING IN LTSS.
Narrative: HOUSTON HANDED US OFF TO MTY CTR. UPON ESTABLISHING RADIO CONTACT WITH MTY CTR WAS CONFIRMED RADAR CONTACT AT FL310. AT APPROX XXYZ, FL310 ON THE CVM 001 DEG R/85 DME OUT OF FL310 FOR 200. WHEN VISUALLY ACQUIRING THE ACFT, IT WAS PASSING L TO R ON A COLLISION COURSE AND CROSSED DIRECTLY UNDER US LESS THAN 1000 FT. NO CALL WAS MADE TO US. WHEN WE ASKED MTY CTR ABOUT THE EVENTS, THE ONLY THING SAID WAS THAT THE ACFT WAS DSNDING FROM FL310 TO 200. NO FURTHER ACTION WAS TAKEN.
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.