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ZOB controller experienced operational error at 17000 ft when initial descending comments were missed and separation was lost with en route traffic.
| Attributes | |
| ACN | 696717 |
| Time | |
| Date | 200605 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : ctw.vor |
| State Reference | OH |
| Altitude | agl single value : 17000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Rain |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc tower : sbp.tower |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 200 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 6 controller time certified in position1 : 4 |
| ASRS Report | 696717 |
| 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 aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 23100 vertical : 600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The E145 checked on frequency descending to 11000 ft; which was not reflected in the data block; nor was 11000 ft LOA altitude. The readback descending to 11000 ft was missed; and the E145 came into conflict with the CRJ2; which was level at 17000 ft. The CRJ2 received an RA and climbed; while the E145 was expedited down. Actions taken were not in time to prevent a loss of separation. Controllers at ZOB are currently working 1 1/2 - 2 hours on position at a time with no break. Many; including myself; are becoming fatigued due to the long sessions and constant WX. I believe this fatigue contributed to the error.
Original NASA ASRS Text
Title: ZOB CTLR EXPERIENCED OPERROR AT 17000 FT WHEN INITIAL DSNDING COMMENTS WERE MISSED AND SEPARATION WAS LOST WITH ENRTE TFC.
Narrative: THE E145 CHKED ON FREQ DSNDING TO 11000 FT; WHICH WAS NOT REFLECTED IN THE DATA BLOCK; NOR WAS 11000 FT LOA ALT. THE READBACK DSNDING TO 11000 FT WAS MISSED; AND THE E145 CAME INTO CONFLICT WITH THE CRJ2; WHICH WAS LEVEL AT 17000 FT. THE CRJ2 RECEIVED AN RA AND CLBED; WHILE THE E145 WAS EXPEDITED DOWN. ACTIONS TAKEN WERE NOT IN TIME TO PREVENT A LOSS OF SEPARATION. CTLRS AT ZOB ARE CURRENTLY WORKING 1 1/2 - 2 HRS ON POS AT A TIME WITH NO BREAK. MANY; INCLUDING MYSELF; ARE BECOMING FATIGUED DUE TO THE LONG SESSIONS AND CONSTANT WX. I BELIEVE THIS FATIGUE CONTRIBUTED TO THE ERROR.
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.