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An LR55 passenger flight is cleared down through an occupied altitude of another aircraft before the controller can correct the error 100 mi sse of msp, mn.
| Attributes | |
| ACN | 519422 |
| Time | |
| Date | 200107 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : msp.airport |
| State Reference | MN |
| Altitude | msl bound lower : 32600 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air taxi |
| Make Model Name | Learjet 55 |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | other |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : commercial pilot : atp pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 150 flight time total : 19500 |
| ASRS Report | 519422 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 80 flight time total : 2015 |
| ASRS Report | 520391 |
| Events | |
| Anomaly | non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : reviewed incident with flight crew faa : investigated |
| Miss Distance | horizontal : 25200 vertical : 0 |
| Supplementary | |
| Problem Areas | ATC Human Performance Airspace Structure |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Both pilots copied and read back cleared to FL250 and lower would be assigned after traffic passed. FL250 was placed in the altitude alert box at that time. Upon passing FL345, the controller at ZMP tried to call someone, but due to interference from another radio call, that was cut out twice. Our sink rate was 2000+ FPM. When the controller did make contact with, we were out of FL326 and I asked what she wanted us to do. I was then instructed to continue down and given a telephone number to call ZMP during business hours. I called ZMP the next morning and the quality control person told me not to worry -- it was their problem, and that the controller would have to go into retraining.
Original NASA ASRS Text
Title: AN LR55 PAX FLT IS CLRED DOWN THROUGH AN OCCUPIED ALT OF ANOTHER ACFT BEFORE THE CTLR CAN CORRECT THE ERROR 100 MI SSE OF MSP, MN.
Narrative: BOTH PLTS COPIED AND READ BACK CLRED TO FL250 AND LOWER WOULD BE ASSIGNED AFTER TFC PASSED. FL250 WAS PLACED IN THE ALT ALERT BOX AT THAT TIME. UPON PASSING FL345, THE CTLR AT ZMP TRIED TO CALL SOMEONE, BUT DUE TO INTERFERENCE FROM ANOTHER RADIO CALL, THAT WAS CUT OUT TWICE. OUR SINK RATE WAS 2000+ FPM. WHEN THE CTLR DID MAKE CONTACT WITH, WE WERE OUT OF FL326 AND I ASKED WHAT SHE WANTED US TO DO. I WAS THEN INSTRUCTED TO CONTINUE DOWN AND GIVEN A TELEPHONE NUMBER TO CALL ZMP DURING BUSINESS HRS. I CALLED ZMP THE NEXT MORNING AND THE QUALITY CTL PERSON TOLD ME NOT TO WORRY -- IT WAS THEIR PROB, AND THAT THE CTLR WOULD HAVE TO GO INTO RETRAINING.
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.