ARTCC controller descended a BA46 through the cruise altitude of a DC9 resulting in a heading change to both aircraft to assure separation even though standard separation was lost.

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Attributes
ACN	473396
Time
Date	200005
Day	Sat
Local Time Of Day	1201 To 1800
Place
State Reference	PA
Altitude	msl single value : 29000
Environment
Flight Conditions	VMC
Weather Elements	Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	BAe 146 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
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	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 11
ASRS Report	473396
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : separated traffic other
Miss Distance	horizontal : 28000 vertical : 1150
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Descent clearance issued to BA46 from FL310 to FL280. DC9 was below at FL290. Separation lost. BA46 was issued a return to FL310. DC9 was turned 30 degrees right. Make sure of your traffic scans.

Original NASA ASRS Text

Title: ARTCC CTLR DSNDED A BA46 THROUGH THE CRUISE ALT OF A DC9 RESULTING IN A HEADING CHANGE TO BOTH ACFT TO ASSURE SEPARATION EVEN THOUGH STANDARD SEPARATION WAS LOST.

Narrative: DSCNT CLRNC ISSUED TO BA46 FROM FL310 TO FL280. DC9 WAS BELOW AT FL290. SEPARATION LOST. BA46 WAS ISSUED A RETURN TO FL310. DC9 WAS TURNED 30 DEGS R. MAKE SURE OF YOUR TFC SCANS.

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.