ZID radar instructor experienced loss of separation during training session.

Attributes
ACN	582659
Time
Date	200305
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : hvq.vor
State Reference	WV
Altitude	msl single value : 28000
Environment
Flight Conditions	IMC
Weather Elements	Turbulence Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	general aviation : corporate
Make Model Name	Cessna Citation Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 12 controller time certified in position1 : 10 controller time certified in position2 : 3
ASRS Report	582659
Person 2
Affiliation	government : faa
Function	controller : radar instruction : trainee
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 21000 vertical : 400
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

WX impacting area. I requested aircraft be moved out of sector 40 mins before error. I was training. We had radar associate and tracker. Very complex traffic with turbulence and deviations. Tracker dropped data blocks of aircraft leaving sector on boundary, then coordinated lower with sector giving us aircraft at FL290 in face of aircraft leaving sector at FL280 (now dropped data blocks) tracker told trainee to descend aircraft to FL280, in immediate confliction with aircraft that just left sector. WX and volume, I believe, were the reasons for this error.

Original NASA ASRS Text

Title: ZID RADAR INSTRUCTOR EXPERIENCED LOSS OF SEPARATION DURING TRAINING SESSION.

Narrative: WX IMPACTING AREA. I REQUESTED ACFT BE MOVED OUT OF SECTOR 40 MINS BEFORE ERROR. I WAS TRAINING. WE HAD RADAR ASSOCIATE AND TRACKER. VERY COMPLEX TFC WITH TURB AND DEVS. TRACKER DROPPED DATA BLOCKS OF ACFT LEAVING SECTOR ON BOUNDARY, THEN COORDINATED LOWER WITH SECTOR GIVING US ACFT AT FL290 IN FACE OF ACFT LEAVING SECTOR AT FL280 (NOW DROPPED DATA BLOCKS) TRACKER TOLD TRAINEE TO DSND ACFT TO FL280, IN IMMEDIATE CONFLICTION WITH ACFT THAT JUST LEFT SECTOR. WX AND VOLUME, I BELIEVE, WERE THE REASONS FOR THIS ERROR.

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.