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ZID controller experienced operational error at FL280 as descending aircraft conflicted with en route traffic.
| Attributes | |
| ACN | 667343 |
| Time | |
| Date | 200508 |
| Place | |
| Locale Reference | navaid : lvt.vortac |
| State Reference | TN |
| Altitude | msl single value : 28000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : personal |
| Make Model Name | Learjet 31 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other vortac |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : personal |
| Make Model Name | Learjet 25 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 8 controller radar : 10 |
| ASRS Report | 667343 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other controllera |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 26400 vertical : 400 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft in my belief were separated. #2 aircraft was nwbound; #1 aircraft was sebound; descending. #1 aircraft was slow in descent. Conflict alert did not activate nor did ZID adep. Aircraft #1 reported a TCASII RA at which time turns were initiated. ZTL reported a loss of separation. After replay; it appeared aircraft #2 made a 4 degree turn from handoff to error occurring. My judgement was mistaken. Separation was lost with one report of 4.4 mi and 400 ft; then separation was re-established.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL280 AS DSNDING ACFT CONFLICTED WITH ENRTE TFC.
Narrative: ACFT IN MY BELIEF WERE SEPARATED. #2 ACFT WAS NWBOUND; #1 ACFT WAS SEBOUND; DSNDING. #1 ACFT WAS SLOW IN DSCNT. CONFLICT ALERT DID NOT ACTIVATE NOR DID ZID ADEP. ACFT #1 RPTED A TCASII RA AT WHICH TIME TURNS WERE INITIATED. ZTL RPTED A LOSS OF SEPARATION. AFTER REPLAY; IT APPEARED ACFT #2 MADE A 4 DEG TURN FROM HDOF TO ERROR OCCURRING. MY JUDGEMENT WAS MISTAKEN. SEPARATION WAS LOST WITH ONE RPT OF 4.4 MI AND 400 FT; THEN SEPARATION WAS RE-ESTABLISHED.
Data retrieved from NASA's ASRS site as of January 2009 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.