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Aircraft was inadvertently descended through an altitude that conflicted with another aircraft resulting in less than standard separation.
| Attributes | |
| ACN | 117903 |
| Time | |
| Date | 198907 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pit |
| State Reference | PA |
| Altitude | msl bound lower : 16000 msl bound upper : 16800 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air taxi |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 117903 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 27600 vertical : 800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working several aircraft with WX in the area and spacing a couple of aircraft to pit for the next sector. An aircraft was issued a heading northeast descending to 11,000'. I was aware of an aircraft at 16,000 wbound and turned the pit inbound jet to 350 degree heading and typed descended to 17,000 in the data block, but actually never issued an altitude of 17,000. It was a case of me not following through and issuing the altitude to keep separation from aircraft at 16,000. Evasive action was not required. The aircraft missed by 4-6 mi and 800'.
Original NASA ASRS Text
Title: ACFT WAS INADVERTENTLY DESCENDED THROUGH AN ALT THAT CONFLICTED WITH ANOTHER ACFT RESULTING IN LESS THAN STANDARD SEPARATION.
Narrative: I WAS WORKING SEVERAL ACFT WITH WX IN THE AREA AND SPACING A COUPLE OF ACFT TO PIT FOR THE NEXT SECTOR. AN ACFT WAS ISSUED A HDG NE DESCENDING TO 11,000'. I WAS AWARE OF AN ACFT AT 16,000 WBOUND AND TURNED THE PIT INBND JET TO 350 DEG HDG AND TYPED DESCENDED TO 17,000 IN THE DATA BLOCK, BUT ACTUALLY NEVER ISSUED AN ALT OF 17,000. IT WAS A CASE OF ME NOT FOLLOWING THROUGH AND ISSUING THE ALT TO KEEP SEPARATION FROM ACFT AT 16,000. EVASIVE ACTION WAS NOT REQUIRED. THE ACFT MISSED BY 4-6 MI AND 800'.
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.