Phl TRACON controller experienced loss of separation.

Attributes
ACN	586522
Time
Date	200306
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : phl.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar pilot : instrument
Experience	controller radar : 20 flight time total : 1200
ASRS Report	586522
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued alert controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 11400 vertical : 600
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was working the north arrival sector. The final vector position was closed and I was sharing the final with the south arrival sector. Air carrier X was the only aircraft on my frequency at the time. The south arrival controller became distraction and missed his turn to final with his aircraft. His aircraft was on the localizer, perpendicular to it, and he advised me he missed the turn and would go into my airspace. The aircraft was at 3000 ft, mine was descending out of 4300 at that time. I told the other controller 'I'm stopped at 4000 ft.' I didn't realize my mistake until air carrier X was at 4000 ft, continuing his descent to his assigned altitude of 3000 ft when I told air carrier X to maintain 4000 ft, plus I turned him to go behind the rj. Separation was lost 2.5 mi and 600 ft. I then turned air carrier X toward the field believing I would have adequate spacing, but a speed differential closed the gap resulting in another loss of separation 1.94-700 ft. Realizing the spacing was inadequate I broke out air carrier X to be resequenced and reported the loss of separation.

Original NASA ASRS Text

Title: PHL TRACON CTLR EXPERIENCED LOSS OF SEPARATION.

Narrative: I WAS WORKING THE N ARR SECTOR. THE FINAL VECTOR POS WAS CLOSED AND I WAS SHARING THE FINAL WITH THE S ARR SECTOR. ACR X WAS THE ONLY ACFT ON MY FREQ AT THE TIME. THE S ARR CTLR BECAME DISTR AND MISSED HIS TURN TO FINAL WITH HIS ACFT. HIS ACFT WAS ON THE LOC, PERPENDICULAR TO IT, AND HE ADVISED ME HE MISSED THE TURN AND WOULD GO INTO MY AIRSPACE. THE ACFT WAS AT 3000 FT, MINE WAS DSNDING OUT OF 4300 AT THAT TIME. I TOLD THE OTHER CTLR 'I'M STOPPED AT 4000 FT.' I DIDN'T REALIZE MY MISTAKE UNTIL ACR X WAS AT 4000 FT, CONTINUING HIS DSCNT TO HIS ASSIGNED ALT OF 3000 FT WHEN I TOLD ACR X TO MAINTAIN 4000 FT, PLUS I TURNED HIM TO GO BEHIND THE RJ. SEPARATION WAS LOST 2.5 MI AND 600 FT. I THEN TURNED ACR X TOWARD THE FIELD BELIEVING I WOULD HAVE ADEQUATE SPACING, BUT A SPD DIFFERENTIAL CLOSED THE GAP RESULTING IN ANOTHER LOSS OF SEPARATION 1.94-700 FT. REALIZING THE SPACING WAS INADEQUATE I BROKE OUT ACR X TO BE RESEQUENCED AND RPTED THE LOSS OF SEPARATION.

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.