 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Conflict alert activates when ZID controller misses conflict between descending C550 and an en route, level H25B. Handoff controller attention diverted to strip posting and marking during event.
| Attributes | |
| ACN | 586938 |
| Time | |
| Date | 200307 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zid.artcc |
| State Reference | IN |
| Altitude | msl single value : 41000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Thunderstorm |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Make Model Name | Citation II S2/Bravo |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Make Model Name | HS 125 Series 700 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 586938 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : handoff position |
| Qualification | controller : radar |
| Experience | controller limited radar : 1 controller military : 2 controller non radar : 1 controller radar : 32 controller time certified in position1 : 28 |
| ASRS Report | 587121 |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : weather non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert |
| Resolutory Action | controller : issued new clearance |
| Miss Distance | horizontal : 27000 vertical : 1200 |
| Supplementary | |
| Problem Areas | ATC Human Performance Environmental Factor |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft Y deviating southwest cleared to proceed to tay when able at FL410. Aircraft X, northbound, descending from FL430 to FL390. Aircraft Y turned south toward tay. Conflict alert activated. Aircraft Y was turned 90 degree right. Aircraft X turned to a 060 degree heading. Supplemental information from acn 587121: radar controller issued left turn to aircraft X for eventual descent to meet letter with area 6 -- FL370 or below for dtw area flts. Routine at time, roughly 7-9 aircraft on frequency. I went to printer to get strips. New flow messages came out for atl and clt airports. I was marking strips, posting, and updating flow messages pertaining to hnn sector. Radar controller in meantime, descended aircraft X to FL390 from FL430. I didn't hear the clearance. When I got back to watching radar, conflict alert had activated. He appeared not to have seen aircraft Y stop deviating southwest and turned due south to tay, head-on with aircraft X. Turns and expediting descent was insufficient to separate the aircraft.
Original NASA ASRS Text
Title: CONFLICT ALERT ACTIVATES WHEN ZID CTLR MISSES CONFLICT BTWN DSNDING C550 AND AN ENRTE, LEVEL H25B. HDOF CTLR ATTN DIVERTED TO STRIP POSTING AND MARKING DURING EVENT.
Narrative: ACFT Y DEVIATING SW CLRED TO PROCEED TO TAY WHEN ABLE AT FL410. ACFT X, NBOUND, DSNDING FROM FL430 TO FL390. ACFT Y TURNED S TOWARD TAY. CONFLICT ALERT ACTIVATED. ACFT Y WAS TURNED 90 DEG R. ACFT X TURNED TO A 060 DEG HDG. SUPPLEMENTAL INFO FROM ACN 587121: RADAR CTLR ISSUED L TURN TO ACFT X FOR EVENTUAL DSCNT TO MEET LETTER WITH AREA 6 -- FL370 OR BELOW FOR DTW AREA FLTS. ROUTINE AT TIME, ROUGHLY 7-9 ACFT ON FREQ. I WENT TO PRINTER TO GET STRIPS. NEW FLOW MESSAGES CAME OUT FOR ATL AND CLT ARPTS. I WAS MARKING STRIPS, POSTING, AND UPDATING FLOW MESSAGES PERTAINING TO HNN SECTOR. RADAR CTLR IN MEANTIME, DSNDED ACFT X TO FL390 FROM FL430. I DIDN'T HEAR THE CLRNC. WHEN I GOT BACK TO WATCHING RADAR, CONFLICT ALERT HAD ACTIVATED. HE APPEARED NOT TO HAVE SEEN ACFT Y STOP DEVIATING SW AND TURNED DUE S TO TAY, HEAD-ON WITH ACFT X. TURNS AND EXPEDITING DSCNT WAS INSUFFICIENT TO SEPARATE THE ACFT.
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.