Small transport X had less than standard separation from air carrier Y. System error.

Attributes
ACN	188079
Time
Date	199108
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : yyz
State Reference	ON
Altitude	msl bound lower : 23000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : czyz
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 70 flight time total : 1700 flight time type : 250
ASRS Report	188079
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 controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 1000 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

Small transport X was advised by the center of a separation error. Small transport X was level at 230. Apparently air carrier Y was climbing to 330. We were on a collision course. Another controller saw the conflict and immediately turned air carrier Y. Czyz center has advised us that both aircraft were in their assigned areas. ATC made the error and a full investigation has begun. We were unaware of the near collision until notified by operations investigation. Both targets merged on the radar screen!

Original NASA ASRS Text

Title: SMT X HAD LTSS FROM ACR Y. SYS ERROR.

Narrative: SMT X WAS ADVISED BY THE CENTER OF A SEPARATION ERROR. SMT X WAS LEVEL AT 230. APPARENTLY ACR Y WAS CLBING TO 330. WE WERE ON A COLLISION COURSE. ANOTHER CTLR SAW THE CONFLICT AND IMMEDIATELY TURNED ACR Y. CZYZ CENTER HAS ADVISED US THAT BOTH ACFT WERE IN THEIR ASSIGNED AREAS. ATC MADE THE ERROR AND A FULL INVESTIGATION HAS BEGUN. WE WERE UNAWARE OF THE NEAR COLLISION UNTIL NOTIFIED BY OPS INVESTIGATION. BOTH TARGETS MERGED ON THE RADAR SCREEN!

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.