A departing IFR air carrier has near midair collision with an inbound VFR small aircraft.

Attributes
ACN	153032
Time
Date	199008
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bdl
State Reference	CT
Altitude	msl bound lower : 5300 msl bound upper : 5500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bdl tower : msp
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : initial
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
ASRS Report	153036
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 3
ASRS Report	153032
Events
Anomaly	conflict : nmac non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

I was working the bdl west departure position and I had a runway 15 departure air carrier X flight planned over the pwl VOR. The arrival controller had a VFR aircraft with no mode C approximately 6 mi southwest of bdl at 6500' heading southwest to 4b8. Since the aircraft had no mode C, the controller manually entered the altitude as 6500'. I turned air carrier X to a 300 degree heading to vector him toward pwl and climbed him to 6000' to pass 500' below the VFR aircraft. As air carrier X passed through approximately 5300' he said he had just missed the other aircraft. I asked the controller next to me to verify the altitude of the VFR aircraft and the VFR aircraft had in fact descended through 5500'; however, the other controller had not manually changed the altitude on the scope, so it still showed 6500'. After reviewing the tapes it appears that the controller working the VFR aircraft did not hear the pilot report leaving 6500'. Supplemental information from acn 153032: I forgot the air carrier climbing and when I finally noticed him he was right under my target leaving 5100'. To add to this problem the VFR aircraft did not have mode C, so I or the departure controller kept up with his altitude. Shortly after air carrier went by the aircraft reported level at 5000'.

Original NASA ASRS Text

Title: A DEPARTING IFR ACR HAS NMAC WITH AN INBOUND VFR SMA.

Narrative: I WAS WORKING THE BDL W DEP POS AND I HAD A RWY 15 DEP ACR X FLT PLANNED OVER THE PWL VOR. THE ARR CTLR HAD A VFR ACFT WITH NO MODE C APPROX 6 MI SW OF BDL AT 6500' HDG SW TO 4B8. SINCE THE ACFT HAD NO MODE C, THE CTLR MANUALLY ENTERED THE ALT AS 6500'. I TURNED ACR X TO A 300 DEG HDG TO VECTOR HIM TOWARD PWL AND CLBED HIM TO 6000' TO PASS 500' BELOW THE VFR ACFT. AS ACR X PASSED THROUGH APPROX 5300' HE SAID HE HAD JUST MISSED THE OTHER ACFT. I ASKED THE CTLR NEXT TO ME TO VERIFY THE ALT OF THE VFR ACFT AND THE VFR ACFT HAD IN FACT DSNDED THROUGH 5500'; HOWEVER, THE OTHER CTLR HAD NOT MANUALLY CHANGED THE ALT ON THE SCOPE, SO IT STILL SHOWED 6500'. AFTER REVIEWING THE TAPES IT APPEARS THAT THE CTLR WORKING THE VFR ACFT DID NOT HEAR THE PLT RPT LEAVING 6500'. SUPPLEMENTAL INFO FROM ACN 153032: I FORGOT THE ACR CLBING AND WHEN I FINALLY NOTICED HIM HE WAS RIGHT UNDER MY TARGET LEAVING 5100'. TO ADD TO THIS PROB THE VFR ACFT DID NOT HAVE MODE C, SO I OR THE DEP CTLR KEPT UP WITH HIS ALT. SHORTLY AFTER ACR WENT BY THE ACFT RPTED LEVEL AT 5000'.

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.