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ARTCC radar controller at ZDV issued descent clearance to an air carrier at FL350 to FL270. The aircraft came in close proximity with 2 other air carrier aircraft presumably in trail at FL330 resulting in an operational error.
| Attributes | |
| ACN | 423057 |
| Time | |
| Date | 199812 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : den |
| State Reference | CO |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Miss Distance | horizontal : 20000 vertical : 800 |
| Supplementary | |
| Air Traffic Incident | Operational Error |
Narrative:
I was vectoring air carrier Z behind air carrier Y. Air carrier X was en route to ege. I descended air carrier X to FL270 from FL350 before air carrier Y passed far enough east to be clear. I was not patient to hold the descent clearance for air carrier X until air carrier Y was clear. It appeared both aircraft were on headings that would provide separation but were not.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR AT ZDV ISSUED DSCNT CLRNC TO AN ACR AT FL350 TO FL270. THE ACFT CAME IN CLOSE PROX WITH 2 OTHER ACR ACFT PRESUMABLY IN TRAIL AT FL330 RESULTING IN AN OPERROR.
Narrative: I WAS VECTORING ACR Z BEHIND ACR Y. ACR X WAS ENRTE TO EGE. I DSNDED ACR X TO FL270 FROM FL350 BEFORE ACR Y PASSED FAR ENOUGH E TO BE CLR. I WAS NOT PATIENT TO HOLD THE DSCNT CLRNC FOR ACR X UNTIL ACR Y WAS CLR. IT APPEARED BOTH ACFT WERE ON HDGS THAT WOULD PROVIDE SEPARATION BUT WERE NOT.
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.