Less than standard separation between air carrier X and mlt Y. System error.

Attributes
ACN	126904
Time
Date	198910
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zbw
State Reference	MA
Altitude	msl bound lower : 19000 msl bound upper : 20000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Military Transport
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : non radar
Qualification	controller : developmental
Experience	controller non radar : 1
ASRS Report	126904
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other other : unspecified atc
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 18000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X was given a clearance to FL200, overflt traffic was at FL210. Company a was not restr for later traffic which was at FL190. At the time of company a's departure, the overflt at FL190 (mlt Y) was a factor with the air carrier X. Human oversight was the main cause of the loss of separation.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION BETWEEN ACR X AND MLT Y. SYSTEM ERROR.

Narrative: ACR X WAS GIVEN A CLRNC TO FL200, OVERFLT TFC WAS AT FL210. COMPANY A WAS NOT RESTR FOR LATER TFC WHICH WAS AT FL190. AT THE TIME OF COMPANY A'S DEP, THE OVERFLT AT FL190 (MLT Y) WAS A FACTOR WITH THE ACR X. HUMAN OVERSIGHT WAS THE MAIN CAUSE OF THE LOSS OF SEPARATION.

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.