Narrative:

Approach initially gave us clearance for runway 26L which I expected. However, after calling traffic ahead of us and us reporting in sight instructions were changed for a visual to runway 26R. This I must say struck me as odd and I repeated the instruction to the captain. He agreed that it was an approach to runway 26R. I proceeded to cross the path of 26L and lined up with 26R. At about my 3 O'clock I saw an aircraft on a constant bearing to us. I called attention to the traffic and asked if he knew of the traffic. The captain saw the traffic and queried the tower at the same time whether we were cleared to land on 26R. Tower responded in the affirmative as to the traffic tower said it was 'for the parallel.' as I narrate this, the aircraft kept coming closer which I kept pointing out. We queried the tower once more. At this time we saw the aircraft dangerously close and obviously lining for 26R. Called the tower to inform we were initiating a go around. Tower came back with an agitated voice that we were now cleared for a 26L approach. An uneventful landing followed. As to the other aircraft they started an evasive maneuver at about the same time, but after conflict was resolved was able to land on 26R. Callback conversation with reporter revealed the following information: reporter states he felt captain was going to follow up so he did not. Report sent to chief pilot and reporter has heard no more. Captain did not see the large transport proximity right away thus not as anxious as first officer.

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Original NASA ASRS Text

Title: MLG ON APCH CLRED TO L RWY. WHEN RPTING FIELD IN SIGHT, CLRNC CHANGED TO R RWY. NMAC WITH LGT ON FINAL.

Narrative: APCH INITIALLY GAVE US CLRNC FOR RWY 26L WHICH I EXPECTED. HOWEVER, AFTER CALLING TFC AHEAD OF US AND US RPTING IN SIGHT INSTRUCTIONS WERE CHANGED FOR A VISUAL TO RWY 26R. THIS I MUST SAY STRUCK ME AS ODD AND I REPEATED THE INSTRUCTION TO THE CAPT. HE AGREED THAT IT WAS AN APCH TO RWY 26R. I PROCEEDED TO CROSS THE PATH OF 26L AND LINED UP WITH 26R. AT ABOUT MY 3 O'CLOCK I SAW AN ACFT ON A CONSTANT BEARING TO US. I CALLED ATTN TO THE TFC AND ASKED IF HE KNEW OF THE TFC. THE CAPT SAW THE TFC AND QUERIED THE TWR AT THE SAME TIME WHETHER WE WERE CLRED TO LAND ON 26R. TWR RESPONDED IN THE AFFIRMATIVE AS TO THE TFC TWR SAID IT WAS 'FOR THE PARALLEL.' AS I NARRATE THIS, THE ACFT KEPT COMING CLOSER WHICH I KEPT POINTING OUT. WE QUERIED THE TWR ONCE MORE. AT THIS TIME WE SAW THE ACFT DANGEROUSLY CLOSE AND OBVIOUSLY LINING FOR 26R. CALLED THE TWR TO INFORM WE WERE INITIATING A GAR. TWR CAME BACK WITH AN AGITATED VOICE THAT WE WERE NOW CLRED FOR A 26L APCH. AN UNEVENTFUL LNDG FOLLOWED. AS TO THE OTHER ACFT THEY STARTED AN EVASIVE MANEUVER AT ABOUT THE SAME TIME, BUT AFTER CONFLICT WAS RESOLVED WAS ABLE TO LAND ON 26R. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES HE FELT CAPT WAS GOING TO FOLLOW UP SO HE DID NOT. RPT SENT TO CHIEF PLT AND RPTR HAS HEARD NO MORE. CAPT DID NOT SEE THE LGT PROX RIGHT AWAY THUS NOT AS ANXIOUS AS FO.

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.