Air carrier X non adherence to ATC clearance (made approach to wrong runway) had near midair collision with air carrier Y. Evasive action taken. Pilot deviation.

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Attributes
ACN	195538
Time
Date	199111
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : den
State Reference	CO
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	VMC
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
Route In Use	approach : visual
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
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 8500 flight time type : 150
ASRS Report	195538
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 250 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X was given an approach to 26L, then when traffic was acquired, we were given visual to 26R. Air carrier Y on our right appeared and was making an approach to 26R also. When we inquired as to his assignment the tower said he was 'cleared for the parallel' which didn't clear up the issue. As we had visual on the conflict, we initiated evasive action, climb, and air carrier Y started a right turn away. Immediately after telling tower we're climbing, tower reclred us to runway 26L. We landed without further incident.

Original NASA ASRS Text

Title: ACR X NON ADHERENCE TO ATC CLRNC (MADE APCH TO WRONG RWY) HAD NMAC WITH ACR Y. EVASIVE ACTION TAKEN. PLTDEV.

Narrative: ACR X WAS GIVEN AN APCH TO 26L, THEN WHEN TFC WAS ACQUIRED, WE WERE GIVEN VISUAL TO 26R. ACR Y ON OUR R APPEARED AND WAS MAKING AN APCH TO 26R ALSO. WHEN WE INQUIRED AS TO HIS ASSIGNMENT THE TWR SAID HE WAS 'CLRED FOR THE PARALLEL' WHICH DIDN'T CLR UP THE ISSUE. AS WE HAD VISUAL ON THE CONFLICT, WE INITIATED EVASIVE ACTION, CLB, AND ACR Y STARTED A R TURN AWAY. IMMEDIATELY AFTER TELLING TWR WE'RE CLBING, TWR RECLRED US TO RWY 26L. WE LANDED WITHOUT FURTHER INCIDENT.

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.