ZDC ARTCC radar controller descended an LR35 through an occupied altitude resulting in a loss of sep...

Attributes
ACN	555520
Time
Date	200207
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cho.airport
State Reference	VA
Altitude	msl single value : 31000
Environment
Weather Elements	Thunderstorm Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdc.artcc
Operator	general aviation : corporate
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : radar/mode c aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 22200 vertical : 1500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #2 was given a descent clearance from FL330 to FL290 without a restr, conflict occurred approximately 4 mins after clearance was given. In-flight emergency, WX, and heavy traffic were all distrs.

Original NASA ASRS Text

Title: ZDC ARTCC RADAR CTLR DSNDED AN LR35 THROUGH AN OCCUPIED ALT RESULTING IN A LOSS OF SEPARATION.

Narrative: ACFT #2 WAS GIVEN A DSCNT CLRNC FROM FL330 TO FL290 WITHOUT A RESTR, CONFLICT OCCURRED APPROX 4 MINS AFTER CLRNC WAS GIVEN. INFLT EMER, WX, AND HVY TFC WERE ALL DISTRS.

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.

ZDC ARTCC radar controller descended an LR35 through an occupied altitude resulting in a loss of separation.