2 GA twin engine aircraft had less than standard separation at same assigned altitude. Operational e...

Attributes
ACN	82173
Time
Date	198802
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ape airport : cmh airport : 3i9
State Reference	OH
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cmh
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Route In Use	approach : visual enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	82173
Person 2
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance none taken : insufficient time other
Consequence	faa : investigated
Miss Distance	horizontal : 13500 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

I was working small transport X from gunne intersection to 3i9 and small transport Y from mnn to cmh. Y had climbed to 4000' off of mnn and was on a vector for a visual approach to cmh. X was proceeding direct to ape and had been descend to 4000' and was level at 4000'. I handed X off to another radar controller for descent to 3000' and the approach. Sometime later the other controller said something to the effect of what were those 2 aircraft doing. I looked and called traffic to Y. The other controller descend X to 3000' and told me X had Y in sight, and he instructed X to maintain visual sep. Y said he did not see the traffic and continued to cmh. The closest the aircraft got to each other was 2.25 mi.

Original NASA ASRS Text

Title: 2 GA TWIN ENGINE ACFT HAD LESS THAN STANDARD SEPARATION AT SAME ASSIGNED ALT. OPERATIONAL ERROR.

Narrative: I WAS WORKING SMT X FROM GUNNE INTXN TO 3I9 AND SMT Y FROM MNN TO CMH. Y HAD CLBED TO 4000' OFF OF MNN AND WAS ON A VECTOR FOR A VISUAL APCH TO CMH. X WAS PROCEEDING DIRECT TO APE AND HAD BEEN DSND TO 4000' AND WAS LEVEL AT 4000'. I HANDED X OFF TO ANOTHER RADAR CTLR FOR DSCNT TO 3000' AND THE APCH. SOMETIME LATER THE OTHER CTLR SAID SOMETHING TO THE EFFECT OF WHAT WERE THOSE 2 ACFT DOING. I LOOKED AND CALLED TFC TO Y. THE OTHER CTLR DSND X TO 3000' AND TOLD ME X HAD Y IN SIGHT, AND HE INSTRUCTED X TO MAINTAIN VISUAL SEP. Y SAID HE DID NOT SEE THE TFC AND CONTINUED TO CMH. THE CLOSEST THE ACFT GOT TO EACH OTHER WAS 2.25 MI.

Data retrieved from NASA's ASRS site as of August 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.

2 GA twin engine aircraft had less than standard separation at same assigned altitude. Operational error.