ARTCC radar controller descended aircraft X through aircraft Y's altitude without providing standard separation. Aircraft X entered approach's airspace without a radar handoff or coordination.

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Attributes
ACN	173245
Time
Date	199103
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : olm
State Reference	WA
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sea
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent other
Route In Use	enroute airway : sea
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : handoff position
Qualification	controller : radar
Experience	controller radar : 15
ASRS Report	173245
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	Other
Miss Distance	horizontal : 6000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Coordination was made for an aircraft to enter seattle approach airspace from seattle center at 8000' rather than 10000'. When the northbound inbound aircraft was first observed on sea approach radar there was an intermittent ARTS tag showing the aircraft leaving 10000'. There was an overflying IFR aircraft at 9000' south bnd 5 mi ahead. Seattle center was talking to both aircraft. Since the northbound inbound aircraft was not a good ARTS target we waited to accept the handoff. The aircraft entered our airspace west/O a handoff completed descending through another aircraft's altitude. The aircraft appeared to be about 1 mi apart.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR DESCENDED ACFT X THROUGH ACFT Y'S ALT WITHOUT PROVIDING STANDARD SEPARATION. ACFT X ENTERED APCH'S AIRSPACE WITHOUT A RADAR HANDOFF OR COORD.

Narrative: COORD WAS MADE FOR AN ACFT TO ENTER SEATTLE APCH AIRSPACE FROM SEATTLE CTR AT 8000' RATHER THAN 10000'. WHEN THE NBND INBND ACFT WAS FIRST OBSERVED ON SEA APCH RADAR THERE WAS AN INTERMITTENT ARTS TAG SHOWING THE ACFT LEAVING 10000'. THERE WAS AN OVERFLYING IFR ACFT AT 9000' S BND 5 MI AHEAD. SEATTLE CTR WAS TALKING TO BOTH ACFT. SINCE THE NBND INBND ACFT WAS NOT A GOOD ARTS TARGET WE WAITED TO ACCEPT THE HDOF. THE ACFT ENTERED OUR AIRSPACE W/O A HDOF COMPLETED DSNDING THROUGH ANOTHER ACFT'S ALT. THE ACFT APPEARED TO BE ABOUT 1 MI APART.

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.