Air carrier X TCASII TA issued traffic from cpr Y on multiple runway operation parallel approachs.

Attributes
ACN	219521
Time
Date	199208
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : den
State Reference	CO
Altitude	msl bound lower : 7600 msl bound upper : 8000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : den
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach landing : missed approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 12000 flight time type : 4000
ASRS Report	219521
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 18000 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Air carrier X had to execute a missed approach due to a TCASII traffic conflict. Den approach had issued a clearance to maintain a heading of 190 degrees to intercept the runway 17L ILS localizer, maintain 8000 ft MSL until established, cleared for the runway 17L ILS/DME 1 approach, contact den tower at targs (FAF). As air carrier X approached targs descending on the GS, our TCASII began to indicate a conflict with an aircraft I believe below and to our right and slightly behind. At targs the captain reported inbound to the tower and asked if the traffic was for a parallel runway 18. The tower instructed us to turn left immediately to a heading of 080 degrees and climb to 8000 MSL as we were descending through 7600 ft MSL. We executed an immediate missed approach turning and climbing as instructed. After landing our company ATC representative was notified and he contacted both the denver center and tower. He was told by the area supervisor that there was no conflict as the aircraft in question was cpr Y on a localizer to runway 18 and the tower had instructed us to abandon the approach due to the fact that the tower was not in radio contact with the cpr Y. Since the tower did have us we were chosen. I find this difficult to believe because of the fact that as we were executing our missed approach a company flight was calling targs inbound. If there is an aircraft which will be in close proximity the approach controller should make you aware. However, I personally do not believe that the cpr Y was the problem.

Original NASA ASRS Text

Title: ACR X TCASII TA ISSUED TFC FROM CPR Y ON MULTIPLE RWY OP PARALLEL APCHS.

Narrative: ACR X HAD TO EXECUTE A MISSED APCH DUE TO A TCASII TFC CONFLICT. DEN APCH HAD ISSUED A CLRNC TO MAINTAIN A HDG OF 190 DEGS TO INTERCEPT THE RWY 17L ILS LOC, MAINTAIN 8000 FT MSL UNTIL ESTABLISHED, CLRED FOR THE RWY 17L ILS/DME 1 APCH, CONTACT DEN TWR AT TARGS (FAF). AS ACR X APCHED TARGS DSNDING ON THE GS, OUR TCASII BEGAN TO INDICATE A CONFLICT WITH AN ACFT I BELIEVE BELOW AND TO OUR R AND SLIGHTLY BEHIND. AT TARGS THE CAPT RPTED INBOUND TO THE TWR AND ASKED IF THE TFC WAS FOR A PARALLEL RWY 18. THE TWR INSTRUCTED US TO TURN L IMMEDIATELY TO A HDG OF 080 DEGS AND CLB TO 8000 MSL AS WE WERE DSNDING THROUGH 7600 FT MSL. WE EXECUTED AN IMMEDIATE MISSED APCH TURNING AND CLBING AS INSTRUCTED. AFTER LNDG OUR COMPANY ATC REPRESENTATIVE WAS NOTIFIED AND HE CONTACTED BOTH THE DENVER CTR AND TWR. HE WAS TOLD BY THE AREA SUPVR THAT THERE WAS NO CONFLICT AS THE ACFT IN QUESTION WAS CPR Y ON A LOC TO RWY 18 AND THE TWR HAD INSTRUCTED US TO ABANDON THE APCH DUE TO THE FACT THAT THE TWR WAS NOT IN RADIO CONTACT WITH THE CPR Y. SINCE THE TWR DID HAVE US WE WERE CHOSEN. I FIND THIS DIFFICULT TO BELIEVE BECAUSE OF THE FACT THAT AS WE WERE EXECUTING OUR MISSED APCH A COMPANY FLT WAS CALLING TARGS INBOUND. IF THERE IS AN ACFT WHICH WILL BE IN CLOSE PROX THE APCH CTLR SHOULD MAKE YOU AWARE. HOWEVER, I PERSONALLY DO NOT BELIEVE THAT THE CPR Y WAS THE PROBLEM.

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.