Reporter states that sector was busy and was also conducting training. Aircraft X had deviated around WX. Aircraft Y was at same altitude, tried to separate both aircraft, was unable, lost standard separation.

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Attributes
ACN	443895
Time
Date	199907
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : ihd.vortac
State Reference	PA
Altitude	agl single value : 17500
Environment
Flight Conditions	IMC
Weather Elements	Thunderstorm Turbulence
Light	Daylight
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
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
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 instruction : instructor
Qualification	controller : radar
Experience	controller time certified in position1 : 11
ASRS Report	443895
Person 2
Affiliation	government : faa
Function	controller : radar instruction : trainee
Qualification	controller : developmental
Experience	controller radar : 1.5
ASRS Report	443885
Events
Anomaly	conflict : airborne less severe inflight encounter : weather non adherence : required legal separation
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas other controllera other controllerb other flight crewa
Resolutory Action	flight crew : took evasive action none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Had 17 aircraft. Inbound push to pit had several aircraft nwbound over nesto. Aircraft Y sebound, had trainee turn aircraft away from inbounds. Aircraft X deviated west back into aircraft Y. Trainee had another situation developing - I had him take care of that. Noticed this and tried to take action on both aircraft, but got no response. Aircraft X responded to TCASII.

Original NASA ASRS Text

Title: RPTR STATES THAT SECTOR WAS BUSY AND WAS ALSO CONDUCTING TRAINING. ACFT X HAD DEVIATED AROUND WX. ACFT Y WAS AT SAME ALT, TRIED TO SEPARATE BOTH ACFT, WAS UNABLE, LOST STANDARD SEPARATION.

Narrative: HAD 17 ACFT. INBOUND PUSH TO PIT HAD SEVERAL ACFT NWBOUND OVER NESTO. ACFT Y SEBOUND, HAD TRAINEE TURN ACFT AWAY FROM INBOUNDS. ACFT X DEVIATED W BACK INTO ACFT Y. TRAINEE HAD ANOTHER SIT DEVELOPING - I HAD HIM TAKE CARE OF THAT. NOTICED THIS AND TRIED TO TAKE ACTION ON BOTH ACFT, BUT GOT NO RESPONSE. ACFT X RESPONDED TO TCASII.

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.