Operational error less than standard separation when a PA31 conflicts with an air carrier B737 at 10...

Attributes
ACN	375488
Time
Date	199707
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cmh
State Reference	OH
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	departure other enroute airway : cmh
Flight Plan	IFR
Aircraft 2
Make Model Name	PA-31 Navajo Chieftan/Mojave/Navajo T1020
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller non radar : 5 controller radar : 18 controller supervisory : 6
ASRS Report	375488
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	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 7800 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While working the north radar position at cmh a conflict aural alarm alerted my attention to a B737 departure west leveling at 10000 ft and an overflt PA31 wnwbound at 10000 ft. I turned the B737 north and the PA31 swbound. I did not receive a flight progress strip on the PA31 overflt and misjudged his course as to where it would affect a departure off cmh wbound. At the time the B737 departed, the PA31's ARTS tag was obscured by 2 other tags. The PA31 flight progress strip was found after the fact lying neatly in the middle of 10 tentative strips.

Original NASA ASRS Text

Title: OPERROR LTSS WHEN A PA31 CONFLICTS WITH AN ACR B737 AT 10000 FT.

Narrative: WHILE WORKING THE N RADAR POS AT CMH A CONFLICT AURAL ALARM ALERTED MY ATTN TO A B737 DEP W LEVELING AT 10000 FT AND AN OVERFLT PA31 WNWBOUND AT 10000 FT. I TURNED THE B737 N AND THE PA31 SWBOUND. I DID NOT RECEIVE A FLT PROGRESS STRIP ON THE PA31 OVERFLT AND MISJUDGED HIS COURSE AS TO WHERE IT WOULD AFFECT A DEP OFF CMH WBOUND. AT THE TIME THE B737 DEPARTED, THE PA31'S ARTS TAG WAS OBSCURED BY 2 OTHER TAGS. THE PA31 FLT PROGRESS STRIP WAS FOUND AFTER THE FACT LYING NEATLY IN THE MIDDLE OF 10 TENTATIVE STRIPS.

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.

Operational error less than standard separation when a PA31 conflicts with an air carrier B737 at 10000 ft.