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Aircraft X descent through occupied altitude had less than standard separation with aircraft Y. System error. Pilot deviation X refused ATC instructions.
| Attributes | |
| ACN | 271664 |
| Time | |
| Date | 199405 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : mlf |
| State Reference | UT |
| Altitude | msl bound lower : 18000 msl bound upper : 18000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | other |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 271664 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : weather non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Aircraft X issued clearance to descend to FL180 swbound for landing cedar city, ut. Aircraft Y nebound FL190, problem recognized with conflict alert. X issued 30 degree left turn said he was unable due to thunderstorm. After this conversation, 2 aircraft were clear. Sectors 44 and 33 were combined, busy sector due to a number of aircraft and WX deviations.
Original NASA ASRS Text
Title: ACFT X DSCNT THROUGH OCCUPIED ALT HAD LTSS WITH ACFT Y. SYS ERROR. PLTDEV X REFUSED ATC INSTRUCTIONS.
Narrative: ACFT X ISSUED CLRNC TO DSND TO FL180 SWBOUND FOR LNDG CEDAR CITY, UT. ACFT Y NEBOUND FL190, PROB RECOGNIZED WITH CONFLICT ALERT. X ISSUED 30 DEG L TURN SAID HE WAS UNABLE DUE TO TSTM. AFTER THIS CONVERSATION, 2 ACFT WERE CLR. SECTORS 44 AND 33 WERE COMBINED, BUSY SECTOR DUE TO A NUMBER OF ACFT AND WX DEVS.
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.