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ARTCC radar controller descended cga a, a C560, through an occupied altitude. The d-side controller noticed the error and advised the radar controller of the potential conflict, however, evasive action was too late to avoid loss of separation.
| Attributes | |
| ACN | 346756 |
| Time | |
| Date | 199609 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : iiu |
| State Reference | KY |
| Altitude | msl bound lower : 33000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | general aviation : corporate |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | other : other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : radar |
| Experience | controller radar : 6 |
| ASRS Report | 346756 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 7 |
| ASRS Report | 346645 |
| 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 : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 (cga a) was handed off from the super high sector to the high sector level at FL350. The radar controller descended aircraft #1 to FL310. Aircraft #2 (military Y), a C21 military jet, was traffic at FL330. I was busy with d-side duties at the time aircraft #1 called on. By the time I returned my attention to the radar scope, noticed the traffic and told the radar controller, aircraft #1 had already started descent. Supplemental information from acn 346645: aircraft 1 eastbound at FL330. I took radar control of aircraft #2 northbound at FL350, inbound to mdw. On initial contact, descended aircraft 2 to FL310 losing standard separation with aircraft #1. Associate controller notified me and I climbed aircraft #2 back to FL350 until separated laterally from aircraft #1.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR DSNDED CGA A, A C560, THROUGH AN OCCUPIED ALT. THE D-SIDE CTLR NOTICED THE ERROR AND ADVISED THE RADAR CTLR OF THE POTENTIAL CONFLICT, HOWEVER, EVASIVE ACTION WAS TOO LATE TO AVOID LOSS OF SEPARATION.
Narrative: ACFT #1 (CGA A) WAS HANDED OFF FROM THE SUPER HIGH SECTOR TO THE HIGH SECTOR LEVEL AT FL350. THE RADAR CTLR DSNDED ACFT #1 TO FL310. ACFT #2 (MIL Y), A C21 MIL JET, WAS TFC AT FL330. I WAS BUSY WITH D-SIDE DUTIES AT THE TIME ACFT #1 CALLED ON. BY THE TIME I RETURNED MY ATTN TO THE RADAR SCOPE, NOTICED THE TFC AND TOLD THE RADAR CTLR, ACFT #1 HAD ALREADY STARTED DSCNT. SUPPLEMENTAL INFO FROM ACN 346645: ACFT 1 EBOUND AT FL330. I TOOK RADAR CTL OF ACFT #2 NBOUND AT FL350, INBOUND TO MDW. ON INITIAL CONTACT, DSNDED ACFT 2 TO FL310 LOSING STANDARD SEPARATION WITH ACFT #1. ASSOCIATE CTLR NOTIFIED ME AND I CLBED ACFT #2 BACK TO FL350 UNTIL SEPARATED LATERALLY FROM ACFT #1.
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.