Controller trainee descended air carrier-large transport through the altitude of another air carrier-large transport resulting in less than standard separation.

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Attributes
ACN	90295
Time
Date	198806
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mxe
State Reference	PA
Altitude	msl bound lower : 16000 msl bound upper : 16300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 3 controller radar : 3
ASRS Report	90295
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : developmental
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance none taken : insufficient time other
Consequence	faa : investigated
Miss Distance	horizontal : 18000 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was administering OJT to a radar trnee and the trnee descended an aircraft at 17000' (large transport X) through another aircraft at 16000' (large transport Y) when I took the frequency and vectored large transport Y, but we had 3 mi horizontal and 300' vertical sep.

Original NASA ASRS Text

Title: CTLR TRAINEE DESCENDED ACR-LGT THROUGH THE ALT OF ANOTHER ACR-LGT RESULTING IN LESS THAN STANDARD SEPARATION.

Narrative: I WAS ADMINISTERING OJT TO A RADAR TRNEE AND THE TRNEE DSNDED AN ACFT AT 17000' (LGT X) THROUGH ANOTHER ACFT AT 16000' (LGT Y) WHEN I TOOK THE FREQ AND VECTORED LGT Y, BUT WE HAD 3 MI HORIZ AND 300' VERT SEP.

Data retrieved from NASA's ASRS site as of August 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.