Controller failed to provide standard IFR separation between 2 aircraft under his control.

Attributes
ACN	143514
Time
Date	199004
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : pmd
State Reference	CA
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : edw
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	143514
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
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 : 9000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Light transport X was descending from 13000', 4 mi east of pmd, en route to vny. The aircraft was assigned to cross 15 mi southwest of pmd at and maintain 8000'. A converging aircraft Y at 10000', IFR initially routed northbound on V201, had been taken off route and put on a vector of approximately 320 degrees on what appeared an attempt to outrun the descending aircraft. Controller neglected to take evasive action, but relied on gaining visibility sep. Light transport X was advised several times of traffic at 10 O'clock, 10000' nwbnd. The descending aircraft was issued traffic at 10 O'clock, 2 mi at 10000', and the callback was 'in sight.' supervisor was looking over the controller's shoulder and aware of the full event. Within a few mins the controller was relieved for a break. The supervisor admonished the controller for his action and he did not report a system error. He told the controller he had less than 3 mi and I corrected the statement to 'he had 1 1/2 mi.' no further action was taken.

Original NASA ASRS Text

Title: CTLR FAILED TO PROVIDE STANDARD IFR SEPARATION BETWEEN 2 ACFT UNDER HIS CONTROL.

Narrative: LTT X WAS DSNDING FROM 13000', 4 MI E OF PMD, ENRTE TO VNY. THE ACFT WAS ASSIGNED TO CROSS 15 MI SW OF PMD AT AND MAINTAIN 8000'. A CONVERGING ACFT Y AT 10000', IFR INITIALLY ROUTED NBOUND ON V201, HAD BEEN TAKEN OFF RTE AND PUT ON A VECTOR OF APPROX 320 DEGS ON WHAT APPEARED AN ATTEMPT TO OUTRUN THE DSNDING ACFT. CTLR NEGLECTED TO TAKE EVASIVE ACTION, BUT RELIED ON GAINING VIS SEP. LTT X WAS ADVISED SEVERAL TIMES OF TFC AT 10 O'CLOCK, 10000' NWBND. THE DSNDING ACFT WAS ISSUED TFC AT 10 O'CLOCK, 2 MI AT 10000', AND THE CALLBACK WAS 'IN SIGHT.' SUPVR WAS LOOKING OVER THE CTLR'S SHOULDER AND AWARE OF THE FULL EVENT. WITHIN A FEW MINS THE CTLR WAS RELIEVED FOR A BREAK. THE SUPVR ADMONISHED THE CTLR FOR HIS ACTION AND HE DID NOT RPT A SYS ERROR. HE TOLD THE CTLR HE HAD LESS THAN 3 MI AND I CORRECTED THE STATEMENT TO 'HE HAD 1 1/2 MI.' NO FURTHER ACTION WAS TAKEN.

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.