Narrative:

While on base bwi approach called out traffic at 2 O'clock and 4 mi, altitude unknown and an light transport jet at 12 O'clock, 5000' MSL on final to runway 33L. The first officer (PNF) called the 2 O'clock, small aircraft Y, in sight. Approach subsequently cleared large transport X for a visual approach to follow the jet traffic at 12 O'clock. The captain (PF) stated he did not have the 12 O'clock traffic in sight and refused the visual. The controller resumed radar vectors to the final approach course to runway 33L bwi. Meanwhile, small aircraft Y was maneuvering below at approximately 2000' MSL and heading in a south westerly direction. It became apparent to the first officer that small aircraft Y could still pose a factor once large transport X turned final for runway 33L bwi and so stated this to the captain. Once large transport X had turned inbound and at about 5 mi out, descending on G/south at approximately 2000', small aircraft Y was still making unpredictable turns while drifting toward large transport X's final approach path. Approach control cleared large transport X for the approach following the jet on a 3 1/2 mi final. It became apparent to both F/east and first officer that small aircraft Y was still a factor and the first officer for the second time so stated to the captain. Small aircraft Y still drifting right to left started to turn toward large transport X and when the aircraft was approximately 2000' horizontal and closing, the second officer aggressively stated 'turn right.' the copilot simultaneously suggested an evasive maneuver. The captain told us both to 'shut up.' he finally sighted small aircraft Y and paused while both aircraft were closing on one another. He initially started a left turn into small aircraft Y, then abruptly made a 30 degree bank to the right and subsequently returned on course. Both aircraft came within 300-500' horizontal and 100' vertical before evasive action was taken by large transport X. Large transport X, at the request of the captain, told the controller of a near miss. The controller's response was, 'a near miss? I thought you had the traffic in sight!' large transport X was handed over to the tower at bwi and cleared to land.

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Original NASA ASRS Text

Title: ACR LGT TOOK EVASIVE ACTION TO AVOID COLLISION WITH SMA.

Narrative: WHILE ON BASE BWI APCH CALLED OUT TFC AT 2 O'CLOCK AND 4 MI, ALT UNKNOWN AND AN LTT JET AT 12 O'CLOCK, 5000' MSL ON FINAL TO RWY 33L. THE F/O (PNF) CALLED THE 2 O'CLOCK, SMA Y, IN SIGHT. APCH SUBSEQUENTLY CLRED LGT X FOR A VISUAL APCH TO FOLLOW THE JET TFC AT 12 O'CLOCK. THE CAPT (PF) STATED HE DID NOT HAVE THE 12 O'CLOCK TFC IN SIGHT AND REFUSED THE VISUAL. THE CTLR RESUMED RADAR VECTORS TO THE FINAL APCH COURSE TO RWY 33L BWI. MEANWHILE, SMA Y WAS MANEUVERING BELOW AT APPROX 2000' MSL AND HDG IN A S WESTERLY DIRECTION. IT BECAME APPARENT TO THE F/O THAT SMA Y COULD STILL POSE A FACTOR ONCE LGT X TURNED FINAL FOR RWY 33L BWI AND SO STATED THIS TO THE CAPT. ONCE LGT X HAD TURNED INBND AND AT ABOUT 5 MI OUT, DSNDING ON G/S AT APPROX 2000', SMA Y WAS STILL MAKING UNPREDICTABLE TURNS WHILE DRIFTING TOWARD LGT X'S FINAL APCH PATH. APCH CTL CLRED LGT X FOR THE APCH FOLLOWING THE JET ON A 3 1/2 MI FINAL. IT BECAME APPARENT TO BOTH F/E AND F/O THAT SMA Y WAS STILL A FACTOR AND THE F/O FOR THE SECOND TIME SO STATED TO THE CAPT. SMA Y STILL DRIFTING RIGHT TO LEFT STARTED TO TURN TOWARD LGT X AND WHEN THE ACFT WAS APPROX 2000' HORIZ AND CLOSING, THE S/O AGGRESSIVELY STATED 'TURN RIGHT.' THE COPLT SIMULTANEOUSLY SUGGESTED AN EVASIVE MANEUVER. THE CAPT TOLD US BOTH TO 'SHUT UP.' HE FINALLY SIGHTED SMA Y AND PAUSED WHILE BOTH ACFT WERE CLOSING ON ONE ANOTHER. HE INITIALLY STARTED A LEFT TURN INTO SMA Y, THEN ABRUPTLY MADE A 30 DEG BANK TO THE RIGHT AND SUBSEQUENTLY RETURNED ON COURSE. BOTH ACFT CAME WITHIN 300-500' HORIZ AND 100' VERT BEFORE EVASIVE ACTION WAS TAKEN BY LGT X. LGT X, AT THE REQUEST OF THE CAPT, TOLD THE CTLR OF A NEAR MISS. THE CTLR'S RESPONSE WAS, 'A NEAR MISS? I THOUGHT YOU HAD THE TFC IN SIGHT!' LGT X WAS HANDED OVER TO THE TWR AT BWI AND CLRED TO LAND.

Data retrieved from NASA's ASRS site as of August 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.