ZNY controller misjudges needed spacing between dash 8 and overtaking B737 inbound to phl.

Attributes
ACN	538885
Time
Date	200202
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : har.vortac
State Reference	PA
Altitude	msl single value : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	538885
Person 2
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe inflight encounter : weather inflight encounter other non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment : conflict alert
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance Weather
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

B737 crew came over 17500 ft, descending to 17000 ft, 5 mi west of har VOR inbound to phl. DH8 was about 10 mi south of har VOR northbound en route. Thought aircraft one was far enough to stay in front of aircraft #2. Poor judgement and winds were factor.

Original NASA ASRS Text

Title: ZNY CTLR MISJUDGES NEEDED SPACING BTWN DASH 8 AND OVERTAKING B737 INBOUND TO PHL.

Narrative: B737 CREW CAME OVER 17500 FT, DSNDING TO 17000 FT, 5 MI W OF HAR VOR INBOUND TO PHL. DH8 WAS ABOUT 10 MI S OF HAR VOR NBOUND ENRTE. THOUGHT ACFT ONE WAS FAR ENOUGH TO STAY IN FRONT OF ACFT #2. POOR JUDGEMENT AND WINDS WERE FACTOR.

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.