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Controller descended aircraft a through aircraft B's altitude with less than standard separation. System error.
| Attributes | |
| ACN | 119592 |
| Time | |
| Date | 198908 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zob |
| State Reference | OH |
| Altitude | msl bound lower : 28000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 119592 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft a was proceeding to syr, reported chop, and asked for lower. Aircraft B was en route at 280. Aircraft a was cleared to 240 creating a loss of separation with aircraft B.
Original NASA ASRS Text
Title: CTLR DESCENDED ACFT A THROUGH ACFT B'S ALT WITH LESS THAN STANDARD SEPARATION. SYSTEM ERROR.
Narrative: ACFT A WAS PROCEEDING TO SYR, REPORTED CHOP, AND ASKED FOR LOWER. ACFT B WAS ENRTE AT 280. ACFT A WAS CLRED TO 240 CREATING A LOSS OF SEPARATION WITH ACFT B.
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.