Narrative:

Cleared for a visual approach to runway 13R at boeing field. We contacted the tower while turning about a 6 mi final for runway 13R. Bfi tower cleared us to land on runway 13R. As we approached the runway; we heard the tower giving a clearance to land to a single engine cessna on runway 13L. As best as I can recall; the cessna was instructed to pass behind a learjet (which was our aircraft) on final for runway 13R. At about 300 ft; we saw the cessna in front of us; passing right to left on a very close-in right base to final for runway 13L. I maneuvered below normal glide path in order to ensure collision avoidance. When our flight paths crossed; I would estimate there was 50 ft horizontal and 25 ft vertical separation. Throughout there were no radio xmissions of unusual nature from any source. Before shutting down on the ramp; I asked the controller for the bfi tower landline phone number. I explained our observations to the bfi tower controller. He did not appear to be aware of any problem or conflict until I called him. Contributing factors: 1) cessna pilot either not understanding or not complying with ATC instructions. 2) tower controller not observing and not visually verifying aircraft compliance.

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Original NASA ASRS Text

Title: SINGLE ENG CESSNA TURNS BASE FOR RWY 13L AT BFI ACROSS FLT PATH OF LJ35 ON FINAL TO RWY 13R. NEAR MISS ENSUES.

Narrative: CLRED FOR A VISUAL APCH TO RWY 13R AT BOEING FIELD. WE CONTACTED THE TWR WHILE TURNING ABOUT A 6 MI FINAL FOR RWY 13R. BFI TWR CLRED US TO LAND ON RWY 13R. AS WE APCHED THE RWY; WE HEARD THE TWR GIVING A CLRNC TO LAND TO A SINGLE ENG CESSNA ON RWY 13L. AS BEST AS I CAN RECALL; THE CESSNA WAS INSTRUCTED TO PASS BEHIND A LEARJET (WHICH WAS OUR ACFT) ON FINAL FOR RWY 13R. AT ABOUT 300 FT; WE SAW THE CESSNA IN FRONT OF US; PASSING R TO L ON A VERY CLOSE-IN R BASE TO FINAL FOR RWY 13L. I MANEUVERED BELOW NORMAL GLIDE PATH IN ORDER TO ENSURE COLLISION AVOIDANCE. WHEN OUR FLT PATHS CROSSED; I WOULD ESTIMATE THERE WAS 50 FT HORIZ AND 25 FT VERT SEPARATION. THROUGHOUT THERE WERE NO RADIO XMISSIONS OF UNUSUAL NATURE FROM ANY SOURCE. BEFORE SHUTTING DOWN ON THE RAMP; I ASKED THE CTLR FOR THE BFI TWR LANDLINE PHONE NUMBER. I EXPLAINED OUR OBSERVATIONS TO THE BFI TWR CTLR. HE DID NOT APPEAR TO BE AWARE OF ANY PROB OR CONFLICT UNTIL I CALLED HIM. CONTRIBUTING FACTORS: 1) CESSNA PLT EITHER NOT UNDERSTANDING OR NOT COMPLYING WITH ATC INSTRUCTIONS. 2) TWR CTLR NOT OBSERVING AND NOT VISUALLY VERIFYING ACFT COMPLIANCE.

Data retrieved from NASA's ASRS site as of January 2009 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.