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Controller vectoring a PA44 and a DC9 to cak airport misjudged DC9 turn rate resulting in an operational error.
| Attributes | |
| ACN | 405053 |
| Time | |
| Date | 199806 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : aco airport : cak |
| State Reference | OH |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : cak |
| Operator | general aviation : personal |
| Make Model Name | PA-44 Seminole Turbo Seminole |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 4 |
| ASRS Report | 405053 |
| Person 2 | |
| Affiliation | government : faa |
| Function | oversight : supervisor |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : ground less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance none taken : unable other |
| Consequence | Other |
| Miss Distance | horizontal : 10200 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
PA44 was on a 040 degree heading to stay north of centerline runway 23 at cak for DC9 traffic landing. Put the DC9 on 050 degree heading for downwind. PA44 was 4 mi north of centerline. Turned DC9 to 360 degrees. Talked to another aircraft and passed a pointout to local controller and checked a handoff I took in southeast quadrant so I didn't lose the tag. I turned PA44 to 090 degrees to pass behind the DC9. I turned the DC9 to a 220 degree heading on the approach. About 12-15 seconds later I issued the traffic that would be passing on his right. The speed of the DC9 indicated, I didn't expect the turn to be so wide. Then the supervisor told me to get the PA44 out of the area so I turned the PA44 360 degrees.
Original NASA ASRS Text
Title: CTLR VECTORING A PA44 AND A DC9 TO CAK ARPT MISJUDGED DC9 TURN RATE RESULTING IN AN OPERROR.
Narrative: PA44 WAS ON A 040 DEG HDG TO STAY N OF CTRLINE RWY 23 AT CAK FOR DC9 TFC LNDG. PUT THE DC9 ON 050 DEG HDG FOR DOWNWIND. PA44 WAS 4 MI N OF CTRLINE. TURNED DC9 TO 360 DEGS. TALKED TO ANOTHER ACFT AND PASSED A POINTOUT TO LCL CTLR AND CHKED A HDOF I TOOK IN SE QUADRANT SO I DIDN'T LOSE THE TAG. I TURNED PA44 TO 090 DEGS TO PASS BEHIND THE DC9. I TURNED THE DC9 TO A 220 DEG HDG ON THE APCH. ABOUT 12-15 SECONDS LATER I ISSUED THE TFC THAT WOULD BE PASSING ON HIS R. THE SPD OF THE DC9 INDICATED, I DIDN'T EXPECT THE TURN TO BE SO WIDE. THEN THE SUPVR TOLD ME TO GET THE PA44 OUT OF THE AREA SO I TURNED THE PA44 360 DEGS.
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.