In an effort to effect coordination with adjoining sectors for a descending LJ35, a ZOB controller misses the pilot's readback, which results in a loss of separation with an en route propeller aircraft at 11000 ft.

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Attributes
ACN	557584
Time
Date	200208
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : vwv.vor
State Reference	OH
Altitude	msl bound lower : 16000 msl bound upper : 11600
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	general aviation : corporate
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Flight Phase	descent : vacating altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 15 controller time certified in position1 : 15
ASRS Report	557584
Person 2
Function	controller : radar other personnel other
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment : conflict alert
Resolutory Action	controller : issued alert controller : separated traffic flight crew : returned to assigned altitude none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 7200 vertical : 500
Supplementary
Problem Areas	Weather Flight Crew Human Performance ATC Human Performance Environmental Factor
Primary Problem	ATC Human Performance

Narrative:

I was working the pandora sector. All dtw area arrs from the south were about 40 mi off course due to WX. 2 aircraft had already entered my airspace in the fdy area in an attempt to get to mizar. The LR35 was over fdy on a 010 degree heading when I descended him to 12000 ft, because of a propeller at 11000 ft I had taken a pointout on. As soon as I issued the clearance, I talked to the tol radar controller to see who I had to miss as he made his way back to a 330 degree heading. Then, I missed the readback. I called lfd to tell him what the aircraft was doing and then switched the aircraft. Lfd was very busy and when the aircraft checked on out of 14000 ft for 11000 ft, the lfd controller missed that check-on as well. WX played a factor as did my expectation of the correct readback. I've got to hear the readback before I do something else. Conflict alert went off when aircraft was at 11500 ft and the lfd controller climbed him immediately to 12000 ft.

Original NASA ASRS Text

Title: IN AN EFFORT TO EFFECT COORD WITH ADJOINING SECTORS FOR A DSNDING LJ35, A ZOB CTLR MISSES THE PLT'S READBACK, WHICH RESULTS IN A LOSS OF SEPARATION WITH AN ENRTE PROP ACFT AT 11000 FT.

Narrative: I WAS WORKING THE PANDORA SECTOR. ALL DTW AREA ARRS FROM THE S WERE ABOUT 40 MI OFF COURSE DUE TO WX. 2 ACFT HAD ALREADY ENTERED MY AIRSPACE IN THE FDY AREA IN AN ATTEMPT TO GET TO MIZAR. THE LR35 WAS OVER FDY ON A 010 DEG HDG WHEN I DSNDED HIM TO 12000 FT, BECAUSE OF A PROP AT 11000 FT I HAD TAKEN A POINTOUT ON. AS SOON AS I ISSUED THE CLRNC, I TALKED TO THE TOL RADAR CTLR TO SEE WHO I HAD TO MISS AS HE MADE HIS WAY BACK TO A 330 DEG HDG. THEN, I MISSED THE READBACK. I CALLED LFD TO TELL HIM WHAT THE ACFT WAS DOING AND THEN SWITCHED THE ACFT. LFD WAS VERY BUSY AND WHEN THE ACFT CHKED ON OUT OF 14000 FT FOR 11000 FT, THE LFD CTLR MISSED THAT CHK-ON AS WELL. WX PLAYED A FACTOR AS DID MY EXPECTATION OF THE CORRECT READBACK. I'VE GOT TO HEAR THE READBACK BEFORE I DO SOMETHING ELSE. CONFLICT ALERT WENT OFF WHEN ACFT WAS AT 11500 FT AND THE LFD CTLR CLBED HIM IMMEDIATELY TO 12000 FT.

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.