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ZOB controller experienced operational error at 15000 ft when departure aircraft slowed for turbulence and following aircraft overtook the aircraft ahead.
| Attributes | |
| ACN | 699450 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zob.artcc |
| State Reference | OH |
| Altitude | msl single value : 15000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Ice Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Make Model Name | Regional Jet 200 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar controller : supervisor |
| ASRS Report | 699450 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 21360 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Separation was lost between 2 dtw departures climbing wbound. The front aircraft; air carrier X at 16000 ft; had been given normal speed (given by dtw) but had reduced to 260 KTS for turbulence. Air carrier Y was handed off at 'normal speed' given by dtw and increased to 320 KTS. ZOB controller then climbed him to 15000 ft. Air carrier Y overtook air carrier X. Sector was extremely busy and complex. Controller descended air carrier X to 11000 ft and separation was lost.
Original NASA ASRS Text
Title: ZOB CTLR EXPERIENCED OPERROR AT 15000 FT WHEN DEP ACFT SLOWED FOR TURB AND FOLLOWING ACFT OVERTOOK THE ACFT AHEAD.
Narrative: SEPARATION WAS LOST BTWN 2 DTW DEPS CLBING WBOUND. THE FRONT ACFT; ACR X AT 16000 FT; HAD BEEN GIVEN NORMAL SPD (GIVEN BY DTW) BUT HAD REDUCED TO 260 KTS FOR TURB. ACR Y WAS HANDED OFF AT 'NORMAL SPD' GIVEN BY DTW AND INCREASED TO 320 KTS. ZOB CTLR THEN CLBED HIM TO 15000 FT. ACR Y OVERTOOK ACR X. SECTOR WAS EXTREMELY BUSY AND COMPLEX. CTLR DSNDED ACR X TO 11000 FT AND SEPARATION WAS LOST.
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.