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ZOB controller misjudged lateral separation required between 2 aircraft as one turns and conflicts with the other. Controller action insufficient to maintain positive separation.
| Attributes | |
| ACN | 513512 |
| Time | |
| Date | 200106 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : dalts |
| State Reference | OH |
| Altitude | msl single value : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Ice Rain |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : personal |
| Make Model Name | Cessna 340/340A |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : vacating altitude climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14 |
| ASRS Report | 513512 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert other controllera |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 22200 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 was departing cak for sbn. Aircraft #2 was inbound to cak from the wnw. Aircraft #1 was put on a heading to clear cle approach airspace, which put him in conflict with aircraft #2. Aircraft #1 was climbing on a 250 degree heading (on course was at least 280 degrees). Aircraft #2 was descended on approximately 110 degree heading. I forgot that aircraft #2 would turn northeast at dalts, which put him in conflict with aircraft #1. I had already switched aircraft #2 to cak approach when I realized that there was a problem. I turned aircraft #1 on course, but it wasn't enough.
Original NASA ASRS Text
Title: ZOB CTLR MISJUDGED LATERAL SEPARATION REQUIRED BTWN 2 ACFT AS ONE TURNS AND CONFLICTS WITH THE OTHER. CTLR ACTION INSUFFICIENT TO MAINTAIN POSITIVE SEPARATION.
Narrative: ACFT #1 WAS DEPARTING CAK FOR SBN. ACFT #2 WAS INBOUND TO CAK FROM THE WNW. ACFT #1 WAS PUT ON A HDG TO CLR CLE APCH AIRSPACE, WHICH PUT HIM IN CONFLICT WITH ACFT #2. ACFT #1 WAS CLBING ON A 250 DEG HDG (ON COURSE WAS AT LEAST 280 DEGS). ACFT #2 WAS DSNDED ON APPROX 110 DEG HDG. I FORGOT THAT ACFT #2 WOULD TURN NE AT DALTS, WHICH PUT HIM IN CONFLICT WITH ACFT #1. I HAD ALREADY SWITCHED ACFT #2 TO CAK APCH WHEN I REALIZED THAT THERE WAS A PROB. I TURNED ACFT #1 ON COURSE, BUT IT WASN'T ENOUGH.
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.