ZBW controller attempts to vector descending AT43 when observing a conflict with an en route AC11.

Attributes
ACN	511061
Time
Date	200105
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : gdm.airport
State Reference	MA
Altitude	msl single value : 8100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw.artcc tower : zzz.tower
Operator	general aviation : personal
Make Model Name	Aero Commander 112
Operating Under FAR Part	Part 91
Flight Phase	cruise : level descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zbw.artcc
Operator	common carrier : air carrier
Make Model Name	ATR 42
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 12 controller radar : 10 controller time certified in position1 : 1.33
ASRS Report	511061
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 other atc equipment : radar aircraft equipment : tcas other controllera
Resolutory Action	controller : issued new clearance controller : separated traffic
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 100
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I descended aircraft #2 from 9000 ft to 7000 ft. When aircraft #2 was about 3 mi from aircraft #1, I noticed the potential conflict had turned aircraft #2 30 degrees right. I had control from the approach control, through the LOA, to descend aircraft #2. Aircraft #1 was in their airspace when they xferred communications of aircraft #2.

Original NASA ASRS Text

Title: ZBW CTLR ATTEMPTS TO VECTOR DSNDING AT43 WHEN OBSERVING A CONFLICT WITH AN ENRTE AC11.

Narrative: I DSNDED ACFT #2 FROM 9000 FT TO 7000 FT. WHEN ACFT #2 WAS ABOUT 3 MI FROM ACFT #1, I NOTICED THE POTENTIAL CONFLICT HAD TURNED ACFT #2 30 DEGS R. I HAD CTL FROM THE APCH CTL, THROUGH THE LOA, TO DSND ACFT #2. ACFT #1 WAS IN THEIR AIRSPACE WHEN THEY XFERRED COMS OF ACFT #2.

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.