<< >> NASA ASRS Report 616566, May 2004

Approach controller recognized a potential conflict when a WW24 appeared to overtake a preceding B737 and issued correcting turns.

Attributes
ACN	616566
Time
Date	200405
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Flight Conditions	VMC
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	climbout : intermediate altitude
Route In Use	departure sid : phl 7
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : phl.tracon
Operator	general aviation : corporate
Make Model Name	IAI1124/1124A/Westwind
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : phl 7
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 2 controller radar : 15
ASRS Report	616566
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure other anomaly
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : separated traffic
Supplementary
Problem Areas	Aircraft ATC Human Performance Airspace Structure
Primary Problem	ATC Human Performance

Narrative:

The B737 departed phl on the phl 7 SID, I climbed him to 12000 ft. The WW24 departed behind the B737 on the phl 7 SID. I climbed the westwind to 5000 ft. I decided that the WW24 was outperforming the B737 and that a potential overtake situation was present. I turned the westwind right to avoid a conflict.

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Original NASA ASRS Text

Title: APCH CTLR RECOGNIZED A POTENTIAL CONFLICT WHEN A WW24 APPEARED TO OVERTAKE A PRECEDING B737 AND ISSUED CORRECTING TURNS.

Narrative: THE B737 DEPARTED PHL ON THE PHL 7 SID, I CLBED HIM TO 12000 FT. THE WW24 DEPARTED BEHIND THE B737 ON THE PHL 7 SID. I CLBED THE WESTWIND TO 5000 FT. I DECIDED THAT THE WW24 WAS OUTPERFORMING THE B737 AND THAT A POTENTIAL OVERTAKE SIT WAS PRESENT. I TURNED THE WESTWIND R TO AVOID A CONFLICT.

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.