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ARTCC radar controller descended an air carrier MD11 through the altitude of an air carrier E120 with less than standard separation.
| Attributes | |
| ACN | 385107 |
| Time | |
| Date | 199711 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fdy |
| State Reference | OH |
| Altitude | msl bound lower : 17000 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Xingu EMB-121 All Series |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 8 controller non radar : 3 controller radar : 17 |
| ASRS Report | 385107 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : anomaly accepted none taken : insufficient time |
| Miss Distance | horizontal : 24816 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Took radar handoff on air carrier X (MD11) from fdy area descending sebound to cmh. Took radar handoff on air carrier Y (E120) from ZID, northeast of rod, proceeding nebound to cle at 17000 ft. I ran the vector lines out, and in my judgement had more than adequate separation between these 2 aircraft. As air carrier X was passing air carrier Y's 12 O'clock position, I issued traffic at 12 O'clock position and 7 mi, descending to 10000 ft. With the speed difference and flight path of the aircraft, I assumed this would be closest proximity, air carrier Y passed 4 1/2 mi behind the air carrier X with 500 ft separation.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR DSNDED AN ACR MD11 THROUGH THE ALT OF AN ACR E120 WITH LTSS.
Narrative: TOOK RADAR HDOF ON ACR X (MD11) FROM FDY AREA DSNDING SEBOUND TO CMH. TOOK RADAR HDOF ON ACR Y (E120) FROM ZID, NE OF ROD, PROCEEDING NEBOUND TO CLE AT 17000 FT. I RAN THE VECTOR LINES OUT, AND IN MY JUDGEMENT HAD MORE THAN ADEQUATE SEPARATION BTWN THESE 2 ACFT. AS ACR X WAS PASSING ACR Y'S 12 O'CLOCK POS, I ISSUED TFC AT 12 O'CLOCK POS AND 7 MI, DSNDING TO 10000 FT. WITH THE SPD DIFFERENCE AND FLT PATH OF THE ACFT, I ASSUMED THIS WOULD BE CLOSEST PROX, ACR Y PASSED 4 1/2 MI BEHIND THE ACR X WITH 500 FT SEPARATION.
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.