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Less than standard separation when controller descended air carrier-medium large transport through altitude of air carrier-medium large transport.
| Attributes | |
| ACN | 91420 |
| Time | |
| Date | 198807 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : wvw |
| State Reference | OH |
| Altitude | msl bound lower : 27500 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 91420 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : non radar |
| Qualification | controller : non radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : insufficient time other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 4000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft were deviating for WX. An aircraft diverted my attention to the south part of the sector asking for WX avoidance routing. That required extensive coordination with adjacent facs. The manual controller and myself were on landlines, coordinating this routing and other things. I looked back up to the 2 aircraft involved and descended the inbound. My attention was diverted back to the aircraft requesting routing. When I looked up on my next scan of the scope I realized what happened. I took action to push the descending aircraft down faster since when I saw it, the descending aircraft was already below the en route aircraft. At this time sep was lost.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION WHEN CTLR DESCENDED ACR-MLG THROUGH ALT OF ACR-MLG.
Narrative: ACFT WERE DEVIATING FOR WX. AN ACFT DIVERTED MY ATTN TO THE S PART OF THE SECTOR ASKING FOR WX AVOIDANCE ROUTING. THAT REQUIRED EXTENSIVE COORD WITH ADJACENT FACS. THE MANUAL CTLR AND MYSELF WERE ON LANDLINES, COORDINATING THIS ROUTING AND OTHER THINGS. I LOOKED BACK UP TO THE 2 ACFT INVOLVED AND DSNDED THE INBND. MY ATTN WAS DIVERTED BACK TO THE ACFT REQUESTING ROUTING. WHEN I LOOKED UP ON MY NEXT SCAN OF THE SCOPE I REALIZED WHAT HAPPENED. I TOOK ACTION TO PUSH THE DSNDING ACFT DOWN FASTER SINCE WHEN I SAW IT, THE DSNDING ACFT WAS ALREADY BELOW THE ENRTE ACFT. AT THIS TIME SEP WAS LOST.
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.