BE1900 flight crew had to take evasive action to miss other traffic. After reviewing tapes with ATC supervisor, it was found that the heading intended for them was actually given to another aircraft.

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Attributes
ACN	462310
Time
Date	200002
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pit.airport
State Reference	PA
Altitude	msl single value : 4000
Environment
Flight Conditions	IMC
Weather Elements	Snow Ice
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pit.tracon tower : lax.tower
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 28l
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : pit.tracon
Make Model Name	Beech 1900
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 4500 flight time type : 1900
ASRS Report	462310
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : cfi pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 1400 flight time type : 150
ASRS Report	462312
Events
Anomaly	conflict : airborne critical other anomaly other
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : took evasive action none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 300
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

We were receiving vectors for an ILS runway 28L approach into pit airport. After several vectors involving altitude and heading changes, our controller called us and stated 'I do not know what you are doing, but you are not flying the heading I assigned to you. Descend immediately and turn to heading 070 degrees.' at that moment our TCASII indicated converging traffic at 2 O'clock and 1 1/2 mi. We quickly descended to avoid the traffic. Once on the ground I called pit approach control to better understand what went wrong. After reviewing the tapes the supervisor verified that we had not missed any calls and we had flown as instructed. Apparently our controller assigned our heading change to another aircraft.

Original NASA ASRS Text

Title: BE1900 FLC HAD TO TAKE EVASIVE ACTION TO MISS OTHER TFC. AFTER REVIEWING TAPES WITH ATC SUPVR, IT WAS FOUND THAT THE HDG INTENDED FOR THEM WAS ACTUALLY GIVEN TO ANOTHER ACFT.

Narrative: WE WERE RECEIVING VECTORS FOR AN ILS RWY 28L APCH INTO PIT ARPT. AFTER SEVERAL VECTORS INVOLVING ALT AND HDG CHANGES, OUR CTLR CALLED US AND STATED 'I DO NOT KNOW WHAT YOU ARE DOING, BUT YOU ARE NOT FLYING THE HDG I ASSIGNED TO YOU. DSND IMMEDIATELY AND TURN TO HDG 070 DEGS.' AT THAT MOMENT OUR TCASII INDICATED CONVERGING TFC AT 2 O'CLOCK AND 1 1/2 MI. WE QUICKLY DSNDED TO AVOID THE TFC. ONCE ON THE GND I CALLED PIT APCH CTL TO BETTER UNDERSTAND WHAT WENT WRONG. AFTER REVIEWING THE TAPES THE SUPVR VERIFIED THAT WE HAD NOT MISSED ANY CALLS AND WE HAD FLOWN AS INSTRUCTED. APPARENTLY OUR CTLR ASSIGNED OUR HDG CHANGE TO ANOTHER ACFT.

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.