Less than standard separation between air carrier and commuter. Operational error.

Attributes
ACN	105415
Time
Date	198902
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : syr
State Reference	NY
Altitude	msl bound lower : 4000 msl bound upper : 4300
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : syr
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 19
ASRS Report	105415
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : required legal separation
Independent Detector	other other : unspecified atc
Resolutory Action	none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 6000 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X and commuter Y were involved in a loss of sep 10 southeast of syr. Air carrier X did not descend as fast as the controller thought they would and as a result there was a loss off sep. Both aircraft were inbound to runway 32. Air carrier X was on a right base and aircraft Y was on a left downwind. Both aircraft were at same altitude. Air carrier X was turned on base and turned on final. Air carrier X overshot final, and was slow in descending. As a result, sep was decreased between the aircraft.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION BETWEEN ACR AND COMMUTER. OPERATIONAL ERROR.

Narrative: ACR X AND COMMUTER Y WERE INVOLVED IN A LOSS OF SEP 10 SE OF SYR. ACR X DID NOT DSND AS FAST AS THE CTLR THOUGHT THEY WOULD AND AS A RESULT THERE WAS A LOSS OFF SEP. BOTH ACFT WERE INBND TO RWY 32. ACR X WAS ON A RIGHT BASE AND ACFT Y WAS ON A LEFT DOWNWIND. BOTH ACFT WERE AT SAME ALT. ACR X WAS TURNED ON BASE AND TURNED ON FINAL. ACR X OVERSHOT FINAL, AND WAS SLOW IN DSNDING. AS A RESULT, SEP WAS DECREASED BTWN THE ACFT.

Data retrieved from NASA's ASRS site as of August 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.