<< >> NASA ASRS Report 638197, November 2004

Phl approach controller observed a slow turning aircraft approaching 10600 ft, issued an interim altitude, but too late to maintain separation.

Attributes
ACN	638197
Time
Date	200411
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : mxe.vortac
State Reference	PA
Altitude	msl bound lower : 10000 msl bound upper : 10600
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl.tracon
Operator	general aviation : corporate
Make Model Name	Global Express
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : phl.tracon
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller time certified in position1 : 13
ASRS Report	638197
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 9.5 controller radar : 18 controller time certified in position1 : 5.5
ASRS Report	638198
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera other controllerb
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 15000 vertical : 400
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

During a climb to 11000 ft, the glex was slow in turning. I issued an altitude restr of 10000 ft. The glex climbed to 10600 ft before descending. Supplemental information from acn 638198: aircraft #1 issued direct sjb, and the pilot acknowledged the instruction. About 1 min later, I noticed that the aircraft still had not turned, so I alerted the other controller who immediately turned the aircraft again.

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Original NASA ASRS Text

Title: PHL APCH CTLR OBSERVED A SLOW TURNING ACFT APCHING 10600 FT, ISSUED AN INTERIM ALT, BUT TOO LATE TO MAINTAIN SEPARATION.

Narrative: DURING A CLB TO 11000 FT, THE GLEX WAS SLOW IN TURNING. I ISSUED AN ALT RESTR OF 10000 FT. THE GLEX CLBED TO 10600 FT BEFORE DSNDING. SUPPLEMENTAL INFO FROM ACN 638198: ACFT #1 ISSUED DIRECT SJB, AND THE PLT ACKNOWLEDGED THE INSTRUCTION. ABOUT 1 MIN LATER, I NOTICED THAT THE ACFT STILL HAD NOT TURNED, SO I ALERTED THE OTHER CTLR WHO IMMEDIATELY TURNED THE ACFT AGAIN.

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.