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Departing small transport climbed into conflict with inbound small transport resulting in less than standard separation.
| Attributes | |
| ACN | 86629 |
| Time | |
| Date | 198804 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : lbf |
| State Reference | NE |
| Altitude | msl bound lower : 4500 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air taxi |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : zdv |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air taxi |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | climbout : intermediate altitude cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 30 |
| ASRS Report | 86629 |
| Person 2 | |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance none taken : insufficient time other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working as an fpl second 19 and 20, combined, a low altitude sector FL230 and below, which covers a large part of nebraska and kansas and some of colorado. Small transport X was wbound on V6 45 miles east of lbf at 6000' inbound to lbf. At that time small transport Z requested a clearance from lbf to far at FL190. Since the wbound arrival to lbf was still 45 miles out, I cleared small transport Z as requested. I later cleared small transport X to descend to 5000' and report the airport in sight and advised I was planning a visual approach. I then called lbf FSS who was working small transport Z and inquired when he would be off. I was told about a minute. When small transport Z did get off, I assumed he was taking off northwbound away from my inbound traffic. I assumed wrong! Small transport Z took off sebound into my traffic which was correct considering the winds. When I realized I might have an error I asked the departing small transport Z whom I now was working to maintain 4000'. Small transport Z rogered but could not stop at 4000', having been so close to the altitude when I gave the clearance. I feel the error was completly my fault. I did have some distractions at the time, I was on the sector for 2 hours alone, however with my vast experience (30 years) I should have known which direction the aircraft was taking off. The error was classified as minor (4 miles and 500')
Original NASA ASRS Text
Title: DEPARTING SMT CLIMBED INTO CONFLICT WITH INBOUND SMT RESULTING IN LESS THAN STANDARD SEPARATION.
Narrative: I WAS WORKING AS AN FPL SEC 19 AND 20, COMBINED, A LOW ALT SECTOR FL230 AND BELOW, WHICH COVERS A LARGE PART OF NEBRASKA AND KANSAS AND SOME OF COLORADO. SMT X WAS WBOUND ON V6 45 MILES EAST OF LBF AT 6000' INBOUND TO LBF. AT THAT TIME SMT Z REQUESTED A CLRNC FROM LBF TO FAR AT FL190. SINCE THE WBOUND ARRIVAL TO LBF WAS STILL 45 MILES OUT, I CLRED SMT Z AS REQUESTED. I LATER CLRED SMT X TO DESCEND TO 5000' AND REPORT THE ARPT IN SIGHT AND ADVISED I WAS PLANNING A VISUAL APCH. I THEN CALLED LBF FSS WHO WAS WORKING SMT Z AND INQUIRED WHEN HE WOULD BE OFF. I WAS TOLD ABOUT A MINUTE. WHEN SMT Z DID GET OFF, I ASSUMED HE WAS TAKING OFF NORTHWBOUND AWAY FROM MY INBOUND TFC. I ASSUMED WRONG! SMT Z TOOK OFF SEBOUND INTO MY TFC WHICH WAS CORRECT CONSIDERING THE WINDS. WHEN I REALIZED I MIGHT HAVE AN ERROR I ASKED THE DEPARTING SMT Z WHOM I NOW WAS WORKING TO MAINTAIN 4000'. SMT Z ROGERED BUT COULD NOT STOP AT 4000', HAVING BEEN SO CLOSE TO THE ALT WHEN I GAVE THE CLRNC. I FEEL THE ERROR WAS COMPLETLY MY FAULT. I DID HAVE SOME DISTRACTIONS AT THE TIME, I WAS ON THE SECTOR FOR 2 HRS ALONE, HOWEVER WITH MY VAST EXPERIENCE (30 YEARS) I SHOULD HAVE KNOWN WHICH DIRECTION THE ACFT WAS TAKING OFF. THE ERROR WAS CLASSIFIED AS MINOR (4 MILES AND 500')
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.