ZOB instrument controller does not hear trainee's control instructions, incorrectly reacts to observed visual radar data and causes his own operational error.

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Attributes
ACN	530584
Time
Date	200111
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dtw.airport
State Reference	MI
Altitude	msl single value : 13500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 11 controller radar : 14
ASRS Report	530584
Person 2
Affiliation	government : faa
Function	controller : radar instruction : trainee
Qualification	controller : non radar
Experience	controller limited radar : 1 controller radar : 2
ASRS Report	530583
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment : conflict alert atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 3500 vertical : 500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X was turned to a 090 degree heading, descended to 11000 ft. Air carrier Y was northeast bound descending to 13000 ft, converging with air carrier X when noticed, air carrier Y was expedited to 11000 ft, but trainer (me), used air carrier yz vice air carrier Y and aircraft didn't descend. At that point we lost vertical and then regained 45 seconds later. Supplemental information from acn 530583: plan was to stack aircraft X at 11000 ft and aircraft Y at 12000 ft. Trainer did not hear me give the clearance to aircraft Y to descend to 13000 ft. Aircraft X was put on a heading of 090, which caused loss of separation when aircraft Y started down.

Original NASA ASRS Text

Title: ZOB INSTR CTLR DOES NOT HEAR TRAINEE'S CTL INSTRUCTIONS, INCORRECTLY REACTS TO OBSERVED VISUAL RADAR DATA AND CAUSES HIS OWN OPERROR.

Narrative: ACR X WAS TURNED TO A 090 DEG HEADING, DSNDED TO 11000 FT. ACR Y WAS NE BOUND DSNDING TO 13000 FT, CONVERGING WITH ACR X WHEN NOTICED, ACR Y WAS EXPEDITED TO 11000 FT, BUT TRAINER (ME), USED ACR YZ VICE ACR Y AND ACFT DIDN'T DSND. AT THAT POINT WE LOST VERTICAL AND THEN REGAINED 45 SECS LATER. SUPPLEMENTAL INFO FROM ACN 530583: PLAN WAS TO STACK ACFT X AT 11000 FT AND ACFT Y AT 12000 FT. TRAINER DID NOT HEAR ME GIVE THE CLRNC TO ACFT Y TO DSND TO 13000 FT. ACFT X WAS PUT ON A HEADING OF 090, WHICH CAUSED LOSS OF SEPARATION WHEN ACFT Y STARTED DOWN.

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.