Captain of an large transport took evasive action during final approach in response to a TCASII RA.

Attributes
ACN	316433
Time
Date	199509
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sea
State Reference	WA
Altitude	agl bound lower : 800 agl bound upper : 900
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tower : sea
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	other other : other pilot : commercial pilot : instrument pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 1400
ASRS Report	316433
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 100 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We were cleared ILS runway 16R at seatac with a sidestep to runway 16L. At approximately 6 NM we saw the runway and made the transition by 5 NM. At 900 ft AGL we had an RA command to climb, the target showed slightly left and 800 ft AGL. I followed the commands and was about to make the missed approach when the 'clear of conflict' command was given. I returned to the GS (VASI) and made a normal, as possible, landing. Seatac tower was not very concerned. The only comment was 'it happens all the time.' 'it was probably a little guy off of boeing.' I think the solution is obvious, light aircraft have no business anywhere near final approach for a major airport. There should be a procedure at boeing to keep them away.

Original NASA ASRS Text

Title: CAPT OF AN LGT TOOK EVASIVE ACTION DURING FINAL APCH IN RESPONSE TO A TCASII RA.

Narrative: WE WERE CLRED ILS RWY 16R AT SEATAC WITH A SIDESTEP TO RWY 16L. AT APPROX 6 NM WE SAW THE RWY AND MADE THE TRANSITION BY 5 NM. AT 900 FT AGL WE HAD AN RA COMMAND TO CLB, THE TARGET SHOWED SLIGHTLY L AND 800 FT AGL. I FOLLOWED THE COMMANDS AND WAS ABOUT TO MAKE THE MISSED APCH WHEN THE 'CLR OF CONFLICT' COMMAND WAS GIVEN. I RETURNED TO THE GS (VASI) AND MADE A NORMAL, AS POSSIBLE, LNDG. SEATAC TWR WAS NOT VERY CONCERNED. THE ONLY COMMENT WAS 'IT HAPPENS ALL THE TIME.' 'IT WAS PROBABLY A LITTLE GUY OFF OF BOEING.' I THINK THE SOLUTION IS OBVIOUS, LIGHT ACFT HAVE NO BUSINESS ANYWHERE NEAR FINAL APCH FOR A MAJOR ARPT. THERE SHOULD BE A PROC AT BOEING TO KEEP THEM AWAY.

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.