Air carrier being vectored to final approach sees traffic which approach says is not thee. Vectored for another ILS approach.

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Attributes
ACN	138083
Time
Date	199002
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : den
State Reference	CO
Altitude	msl bound lower : 8000 msl bound upper : 8000
Environment
Flight Conditions	Mixed
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : den
Operator	common carrier : air carrier
Make Model Name	Medium Transport
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6800 flight time type : 2000
ASRS Report	138083
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe non adherence : required legal separation other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 5800 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were level at 8000' receiving vectors from denver final approach control to the ILS DME 1 17L at den. Airspeed 170 KTS. We were in and out of the cloud bases at 8000'. We had received and acknowledged an assigned heading of 120 degree with no instructions to intercept the localizer. About the time we were crossing the localizer. The first officer noticed traffic (an medium large transport) at our 9 O'clock position headed toward us (his heading appeared to be approximately 190 degree or 200 degree). He appeared to be within 1 mi. The first officer asked the controller about the traffic at 9 O'clock. The controller replied that there was 'no traffic' at 9 O'clock to us. The traffic that we saw then radioed that he had the traffic (us) at 10 O'clock as he was passing behind us. The controller mentioned that we were supposed to intercept the localizer, but we had not received or acknowledged such a clearance. We maintained heading 120 degree and passed clear and approach broke us out and vectored us for another ILS.

Original NASA ASRS Text

Title: ACR BEING VECTORED TO FINAL APCH SEES TRAFFIC WHICH APCH SAYS IS NOT THEE. VECTORED FOR ANOTHER ILS APCH.

Narrative: WE WERE LEVEL AT 8000' RECEIVING VECTORS FROM DENVER FINAL APCH CTL TO THE ILS DME 1 17L AT DEN. AIRSPEED 170 KTS. WE WERE IN AND OUT OF THE CLOUD BASES AT 8000'. WE HAD RECEIVED AND ACKNOWLEDGED AN ASSIGNED HDG OF 120 DEG WITH NO INSTRUCTIONS TO INTERCEPT THE LOC. ABOUT THE TIME WE WERE XING THE LOC. THE F/O NOTICED TFC (AN MLG) AT OUR 9 O'CLOCK POSITION HEADED TOWARD US (HIS HDG APPEARED TO BE APPROX 190 DEG OR 200 DEG). HE APPEARED TO BE WITHIN 1 MI. THE F/O ASKED THE CTLR ABOUT THE TFC AT 9 O'CLOCK. THE CTLR REPLIED THAT THERE WAS 'NO TFC' AT 9 O'CLOCK TO US. THE TFC THAT WE SAW THEN RADIOED THAT HE HAD THE TFC (US) AT 10 O'CLOCK AS HE WAS PASSING BEHIND US. THE CTLR MENTIONED THAT WE WERE SUPPOSED TO INTERCEPT THE LOC, BUT WE HAD NOT RECEIVED OR ACKNOWLEDGED SUCH A CLRNC. WE MAINTAINED HDG 120 DEG AND PASSED CLEAR AND APCH BROKE US OUT AND VECTORED US FOR ANOTHER ILS.

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.