ZID ARTCC trainee controller had a loss of separation between a BE40 climbing and a HS25 descending.

Attributes
ACN	635571
Time
Date	200410
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : dqn.vortac
State Reference	OH
Altitude	msl single value : 11000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	general aviation : corporate
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude climbout : vacating altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	general aviation : corporate
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar instruction : trainee
Qualification	controller : developmental
ASRS Report	635571
Person 2
Affiliation	government : faa
Function	controller : radar instruction : instructor
Qualification	controller : radar
Experience	controller military : 6 controller radar : 6
ASRS Report	635573
Events
Anomaly	conflict : airborne critical non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment : conflict alert atc equipment other atc equipment : radar mode c aircraft equipment : tcas other controllera other controllerb other flight crewa other flight crewb other other : 3
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 9600 vertical : 500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft Y was a dayton, oh, arrival descending to 12000 ft. Aircraft X was a columbus, oh, departure, climbing to 11000 ft. Both aircraft were wbound, and on converging courses. I was the trainee, with an instructor watching and an fpl d-side. I was focused on another area of departures out of cincinnati, oh, and by the time I got back to aircraft Y and aircraft X, they were converging and I needed a plan to get aircraft X climbing and on course, and aircraft Y down into dayton approach airspace. I then turned aircraft X to a 260 degree heading to turn away from aircraft Y. Aircraft were still separated at this point by altitude. I heard my instructor tell me to 'turn him to a 340 degree heading' which I did, turning aircraft X to a 340 degree heading. Instructor told me not to turn aircraft X at this time, because he actually said 'what I would have done was turn aircraft X to a 340 degree heading.' I then told aircraft X to 'disregard, fly heading 260 degrees.' there was no readback, which all 3 of us missed. My d-side had gotten me a lower altitude from approach for aircraft Y, which I descended to 10000 ft. Aircraft X was actually in the turn to a 340 degree heading turning into the path of aircraft Y. Separation was lost. Supplemental information from acn 635573: trainee turned aircraft X to a ridiculous heading. Told him to turn him back. I missed a non readback.

Original NASA ASRS Text

Title: ZID ARTCC TRAINEE CTLR HAD A LOSS OF SEPARATION BTWN A BE40 CLBING AND A HS25 DSNDING.

Narrative: ACFT Y WAS A DAYTON, OH, ARR DSNDING TO 12000 FT. ACFT X WAS A COLUMBUS, OH, DEP, CLBING TO 11000 FT. BOTH ACFT WERE WBOUND, AND ON CONVERGING COURSES. I WAS THE TRAINEE, WITH AN INSTRUCTOR WATCHING AND AN FPL D-SIDE. I WAS FOCUSED ON ANOTHER AREA OF DEPS OUT OF CINCINNATI, OH, AND BY THE TIME I GOT BACK TO ACFT Y AND ACFT X, THEY WERE CONVERGING AND I NEEDED A PLAN TO GET ACFT X CLBING AND ON COURSE, AND ACFT Y DOWN INTO DAYTON APCH AIRSPACE. I THEN TURNED ACFT X TO A 260 DEG HDG TO TURN AWAY FROM ACFT Y. ACFT WERE STILL SEPARATED AT THIS POINT BY ALT. I HEARD MY INSTRUCTOR TELL ME TO 'TURN HIM TO A 340 DEG HDG' WHICH I DID, TURNING ACFT X TO A 340 DEG HDG. INSTRUCTOR TOLD ME NOT TO TURN ACFT X AT THIS TIME, BECAUSE HE ACTUALLY SAID 'WHAT I WOULD HAVE DONE WAS TURN ACFT X TO A 340 DEG HDG.' I THEN TOLD ACFT X TO 'DISREGARD, FLY HDG 260 DEGS.' THERE WAS NO READBACK, WHICH ALL 3 OF US MISSED. MY D-SIDE HAD GOTTEN ME A LOWER ALT FROM APCH FOR ACFT Y, WHICH I DSNDED TO 10000 FT. ACFT X WAS ACTUALLY IN THE TURN TO A 340 DEG HDG TURNING INTO THE PATH OF ACFT Y. SEPARATION WAS LOST. SUPPLEMENTAL INFO FROM ACN 635573: TRAINEE TURNED ACFT X TO A RIDICULOUS HDG. TOLD HIM TO TURN HIM BACK. I MISSED A NON READBACK.

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.