Narrative:

Sea approach asked if we wanted a visual approach. We declined as boeing field is in a valley and was not in sight. Immediately approach began calling out 3 traffic contacts in quick succession and then turned us to a dogleg to intercept the localizer. The first officer saw the second and third aircraft and overbanked sharply to avoid a near miss incident. There is something wrong when a heavy jet has to play 'dodge 'em' on final. The system worked. However, 3 contacts, assumed VFR, inside of 2-3 NM all at once is crew (2-MAN) overload. We saw only 2 of the 3 and they were both small and poorly lit. In a field that relies on redundancy for safety, we saw only a last min advisory from ATC to prevent a near miss or possible collision over north seattle. The gray overcast skies made a visual outside scan alone, problematic at best. TCASII not required for all cargo aircraft, but it should be. VFR traffic should be strongly reminded to avoid approach corridors to airports and advised that they are, like motorcycles, very difficult to see by heavy jets.

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Original NASA ASRS Text

Title: FLC OF A B767 TOOK EVASIVE ACTION BY TURNING TO AVOID 2 FLOAT PLANES TRANSITING IN THE OPPOSITE DIRECTION FROM THE APCH JUST OUTSIDE THE OM. THE B767 WAS NOT EQUIPPED WITH TCASII SINCE IT WAS A CARGO ACFT.

Narrative: SEA APCH ASKED IF WE WANTED A VISUAL APCH. WE DECLINED AS BOEING FIELD IS IN A VALLEY AND WAS NOT IN SIGHT. IMMEDIATELY APCH BEGAN CALLING OUT 3 TFC CONTACTS IN QUICK SUCCESSION AND THEN TURNED US TO A DOGLEG TO INTERCEPT THE LOC. THE FO SAW THE SECOND AND THIRD ACFT AND OVERBANKED SHARPLY TO AVOID A NEAR MISS INCIDENT. THERE IS SOMETHING WRONG WHEN A HVY JET HAS TO PLAY 'DODGE 'EM' ON FINAL. THE SYS WORKED. HOWEVER, 3 CONTACTS, ASSUMED VFR, INSIDE OF 2-3 NM ALL AT ONCE IS CREW (2-MAN) OVERLOAD. WE SAW ONLY 2 OF THE 3 AND THEY WERE BOTH SMALL AND POORLY LIT. IN A FIELD THAT RELIES ON REDUNDANCY FOR SAFETY, WE SAW ONLY A LAST MIN ADVISORY FROM ATC TO PREVENT A NEAR MISS OR POSSIBLE COLLISION OVER N SEATTLE. THE GRAY OVCST SKIES MADE A VISUAL OUTSIDE SCAN ALONE, PROBLEMATIC AT BEST. TCASII NOT REQUIRED FOR ALL CARGO ACFT, BUT IT SHOULD BE. VFR TFC SHOULD BE STRONGLY REMINDED TO AVOID APCH CORRIDORS TO ARPTS AND ADVISED THAT THEY ARE, LIKE MOTORCYCLES, VERY DIFFICULT TO SEE BY HVY JETS.

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.