Approach controller at roc vectors 2 aircraft head-on to each other resulting in an operational erro...

Attributes
ACN	546067
Time
Date	200205
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : roc.vortac
State Reference	NY
Altitude	msl single value : 2500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : roc.tracon
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Navigation In Use	ils localizer & glide slope : 28
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : roc.tracon
Make Model Name	Commercial Fixed Wing
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach controller : departure
Qualification	controller : radar
Experience	controller radar : 6
ASRS Report	546067
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : nmac non adherence : published procedure
Independent Detector	atc equipment other atc equipment : radar other controllera other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I sat down to work radar and after receiving my briefing, I turned air carrier X (a B190 who had been previously radar vectored to a 120 degree heading and descended to 2500 ft for ILS runway 28 approach) to a heading of 180 degrees. Air carrier Y was previously assigned 030 degree heading and descended to 2500 ft, however, I was briefed he was going to 4000 ft. As I was turning air carrier Z, CL64, onto the final, I realized air carrier Y had descended below 4000 ft and was head-on with air carrier X. Both received TCASII alerts and separation was lost.

Original NASA ASRS Text

Title: APCH CTLR AT ROC VECTORS 2 ACFT HEAD-ON TO EACH OTHER RESULTING IN AN OPERROR.

Narrative: I SAT DOWN TO WORK RADAR AND AFTER RECEIVING MY BRIEFING, I TURNED ACR X (A B190 WHO HAD BEEN PREVIOUSLY RADAR VECTORED TO A 120 DEG HDG AND DSNDED TO 2500 FT FOR ILS RWY 28 APCH) TO A HDG OF 180 DEGS. ACR Y WAS PREVIOUSLY ASSIGNED 030 DEG HDG AND DSNDED TO 2500 FT, HOWEVER, I WAS BRIEFED HE WAS GOING TO 4000 FT. AS I WAS TURNING ACR Z, CL64, ONTO THE FINAL, I REALIZED ACR Y HAD DSNDED BELOW 4000 FT AND WAS HEAD-ON WITH ACR X. BOTH RECEIVED TCASII ALERTS AND SEPARATION WAS LOST.

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.

Approach controller at roc vectors 2 aircraft head-on to each other resulting in an operational error.