Azo controller described conflict event at 7000 ft when they failed to accurately judge climb perfor...

Attributes
ACN	825258
Time
Date	200902
Local Time Of Day	0601-1200
Place
Locale Reference	AZO.Airport
State Reference	MI
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-30 Twin Comanche
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Flight Plan	IFR
Aircraft 2
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Approach
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 1.5
Events
Anomaly	Conflict Airborne Conflict
Miss Distance	Horizontal 17760 Vertical 600

Narrative:

Twin comanche departed given heading to join airway and resume own navigation. Then climbed to 8;000 ft. Seen C182 40 miles southwest climbing northeastbound. Vectoring other aircraft to airports copying runway closures at satellite airports. C182 calls in level at 7;000 ft; twin comanche; still climbing; turning left to heading 170 degrees. Then turned C182 to heading 330 degrees; and twin comanche to a 160 degree heading. Headings were given prior to loss of separation. Separation loss was less than 15 seconds; no conflict alert. Both aircraft given turns back on course. Contributing factors: saying the twin will out-climb the single to the same altitudes. Other duty distractions.

Original NASA ASRS Text

Title: AZO Controller described conflict event at 7000 FT when they failed to accurately judge climb performance coupled with other distracting position duties.

Narrative: Twin Comanche departed given heading to join airway and resume own navigation. Then climbed to 8;000 FT. Seen C182 40 miles southwest climbing northeastbound. Vectoring other aircraft to airports copying runway closures at satellite airports. C182 calls in level at 7;000 FT; Twin Comanche; still climbing; turning left to heading 170 degrees. Then turned C182 to heading 330 degrees; and Twin Comanche to a 160 degree heading. Headings were given prior to loss of separation. Separation loss was less than 15 seconds; no conflict alert. Both aircraft given turns back on course. Contributing Factors: Saying the twin will out-climb the single to the same altitudes. Other duty distractions.

Data retrieved from NASA's ASRS site as of April 2012 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.

Azo controller described conflict event at 7000 ft when they failed to accurately judge climb performance coupled with other distracting position duties.