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Reported less than standard separation when reporter failed to notice the navigation turn of an AJ25 which conflicted with a C560 at the same altitude.
| Attributes | |
| ACN | 364314 |
| Time | |
| Date | 199703 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : gri |
| State Reference | NE |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| Operator | general aviation : corporate |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | IAI1125 (Astra) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 16 |
| ASRS Report | 364314 |
| Person 2 | |
| Affiliation | Other |
| 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 | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 9000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #2 was a test flight off lincoln. Aircraft #1 was oma departure wbound both at FL350. Aircraft #2 made a left turn at gri and was in conflict with aircraft #1. Aircraft #2 was given descent clearance to FL330 twice, but no response from pilot. Aircraft #1 was then given descent clearance to FL330. He responded. At that point I noticed aircraft #2 was also in a descent. Aircraft #2 was then told twice to climb to and maintain FL350, but no response from pilot. Aircraft #2 was now below aircraft #1 so I issued climb to aircraft #1 to FL350. I then noticed aircraft #2 was also in a climb. I then issued descent to aircraft #1 and maintain FL350 to aircraft #2. Aircraft #2 responded and reported level at FL350. Aircraft #1 was given further descent to FL310. Separation was lost. The situation could have been avoided if I had noticed aircraft #2 would be making a south turn at gri. And if aircraft #2 had responded to my initial descent clrncs.
Original NASA ASRS Text
Title: RPTED LTSS WHEN RPTR FAILED TO NOTICE THE NAV TURN OF AN AJ25 WHICH CONFLICTED WITH A C560 AT THE SAME ALT.
Narrative: ACFT #2 WAS A TEST FLT OFF LINCOLN. ACFT #1 WAS OMA DEP WBOUND BOTH AT FL350. ACFT #2 MADE A L TURN AT GRI AND WAS IN CONFLICT WITH ACFT #1. ACFT #2 WAS GIVEN DSCNT CLRNC TO FL330 TWICE, BUT NO RESPONSE FROM PLT. ACFT #1 WAS THEN GIVEN DSCNT CLRNC TO FL330. HE RESPONDED. AT THAT POINT I NOTICED ACFT #2 WAS ALSO IN A DSCNT. ACFT #2 WAS THEN TOLD TWICE TO CLB TO AND MAINTAIN FL350, BUT NO RESPONSE FROM PLT. ACFT #2 WAS NOW BELOW ACFT #1 SO I ISSUED CLB TO ACFT #1 TO FL350. I THEN NOTICED ACFT #2 WAS ALSO IN A CLB. I THEN ISSUED DSCNT TO ACFT #1 AND MAINTAIN FL350 TO ACFT #2. ACFT #2 RESPONDED AND RPTED LEVEL AT FL350. ACFT #1 WAS GIVEN FURTHER DSCNT TO FL310. SEPARATION WAS LOST. THE SIT COULD HAVE BEEN AVOIDED IF I HAD NOTICED ACFT #2 WOULD BE MAKING A S TURN AT GRI. AND IF ACFT #2 HAD RESPONDED TO MY INITIAL DSCNT CLRNCS.
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.