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ZLC controller described a loss of separation event when traffic on the ILS to jac was overtaking preceding traffic; issued a go around and conflicted with the preceding traffic when a missed approach was initiated; one reporter suggesting an eram enhancement three mile separation procedure should be authorized.
| Attributes | |
| ACN | 938340 |
| Time | |
| Date | 201103 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZLC.ARTCC |
| State Reference | UT |
| Aircraft 1 | |
| Make Model Name | Regional Jet 700 ER/LR (CRJ700) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach Final Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Falcon 50 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Person 2 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Published Material / Policy |
Narrative:
A FA50 was on an ILS approach at jac. A CRJ7 was 18 NM in trail of the FA50 when the FA50 was over dnw starting the ILS approach. The CRJ7 had an overtake on the FA50; but I felt there was enough distance to clear the CRJ7 for an ILS approach as well. When it became apparent the overtake was too great; I climbed the CRJ7 to 14;000 MSL. The CRJ7 responded and started a climb. Less than a minute later jac tower called to say the FA50 was on a missed approach also climbing to 14;000 MSL. I climbed the CRJ7 to 15;000 MSL and told him to expedite for traffic. The FA50 reported on frequency on the missed approach procedure climbing to 14;000 MSL. The FA50's climb rate exceeded that of the CRJ7 and separation was lost. Once the CRJ7 was at a safe vectoring altitude I issued a turn clearance to reestablish separation. Recommendation; next time I will maintain separation.
Original NASA ASRS Text
Title: ZLC Controller described a loss of separation event when traffic on the ILS to JAC was overtaking preceding traffic; issued a go around and conflicted with the preceding traffic when a missed approach was initiated; one reporter suggesting an ERAM enhancement three mile separation procedure should be authorized.
Narrative: A FA50 was on an ILS approach at JAC. A CRJ7 was 18 NM in trail of the FA50 when the FA50 was over DNW starting the ILS approach. The CRJ7 had an overtake on the FA50; but I felt there was enough distance to clear the CRJ7 for an ILS approach as well. When it became apparent the overtake was too great; I climbed the CRJ7 to 14;000 MSL. The CRJ7 responded and started a climb. Less than a minute later JAC Tower called to say the FA50 was on a missed approach also climbing to 14;000 MSL. I climbed the CRJ7 to 15;000 MSL and told him to expedite for traffic. The FA50 reported on frequency on the missed approach procedure climbing to 14;000 MSL. The FA50's climb rate exceeded that of the CRJ7 and separation was lost. Once the CRJ7 was at a safe vectoring altitude I issued a turn clearance to reestablish separation. Recommendation; next time I will maintain separation.
Data retrieved from NASA's ASRS site as of April 2012 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.