Loss of separation between a CL60 climbing to FL370 and an astra level at FL370.

Attributes
ACN	399112
Time
Date	199804
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : lyh
State Reference	VA
Altitude	msl bound lower : 36300 msl bound upper : 37000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Make Model Name	Challenger CL600
Operating Under FAR Part	other : unknown
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	IAI1125 (Astra)
Operating Under FAR Part	other : unknown
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 10
ASRS Report	399112
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 19800 vertical : 700
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

CL60 sbound requesting FL390. Astra was northbound FL370. During CL60 climb, the two passed within 3.3 mi horizontal and 700 ft vertical. The CL60 was descended to FL350 and turned. The astra was also turned. After passage, the two were returned on course.

Original NASA ASRS Text

Title: LOSS OF SEPARATION BTWN A CL60 CLBING TO FL370 AND AN ASTRA LEVEL AT FL370.

Narrative: CL60 SBOUND REQUESTING FL390. ASTRA WAS NBOUND FL370. DURING CL60 CLB, THE TWO PASSED WITHIN 3.3 MI HORIZ AND 700 FT VERT. THE CL60 WAS DSNDED TO FL350 AND TURNED. THE ASTRA WAS ALSO TURNED. AFTER PASSAGE, THE TWO WERE RETURNED ON COURSE.

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.