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ARTCC radar controller reassigns descending altitude for military aircraft and climbs air carrier to same altitude. Controller does not recognize error until separation was lost.
| Attributes | |
| ACN | 410820 |
| Time | |
| Date | 199808 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : elx |
| State Reference | MI |
| Altitude | msl bound lower : 28000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | other |
| Make Model Name | Military Transport |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 10 |
| ASRS Report | 410820 |
| Person 2 | |
| Affiliation | government : military |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : military |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 9000 vertical : 900 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 checked on climbing to FL310 due to other traffic and poor rate of climb. Aircraft #1 was dsdned back to FL280. Aircraft #2 was climbed to FL250 for traffic. When aircraft #1 left FL280, aircraft #2 was climbed to FL280. The flight paths were converging. Aircraft #2's altitude was not revised to FL270. Separation was lost.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR REASSIGNS DSNDING ALT FOR MIL ACFT AND CLBS ACR TO SAME ALT. CTLR DOES NOT RECOGNIZE ERROR UNTIL SEPARATION WAS LOST.
Narrative: ACFT #1 CHECKED ON CLBING TO FL310 DUE TO OTHER TFC AND POOR RATE OF CLB. ACFT #1 WAS DSDNED BACK TO FL280. ACFT #2 WAS CLBED TO FL250 FOR TFC. WHEN ACFT #1 LEFT FL280, ACFT #2 WAS CLBED TO FL280. THE FLT PATHS WERE CONVERGING. ACFT #2'S ALT WAS NOT REVISED TO FL270. SEPARATION WAS LOST.
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.