B737 landing runway 10 at pdx experienced TCASII RA with ATC issued traffic.

Attributes
ACN	605535
Time
Date	200401
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pdx.airport
State Reference	OR
Altitude	agl single value : 800
Environment
Flight Conditions	IMC
Weather Elements	Rain
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : p80.tracon tower : pdx.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 10l other
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Route In Use	approach : traffic pattern
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 8500 flight time type : 5500
ASRS Report	605535
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 200 vertical : 1200
Supplementary
Problem Areas	Airport Flight Crew Human Performance Airspace Structure Aircraft
Primary Problem	Airspace Structure

Narrative:

Pdx WX 24 broken, 35 overcast 7-R 5 degrees/4 degrees 100-9 ILS runways 10L and 10R in use. Visibility lower to the west. Approach control: 'maintain 2000 ft till established, cleared for ILS runway 10L. Traffic 10 O'clock position, 6 mi, probably just off of pearson airpark.' tower, 'cleared to land runway 10L,' plus traffic report. Us, 'IMC in and out of the bases and rain.' TCASII RA at 800 ft AGL. Target showed 600 ft on TCASII. First officer disengaged autoplt and executed evasive action in compliance with RA to 1200 ft AGL. As we passed clear of conflict we broke out of the clouds and made a normal visual approach and uneventful landing. After landing, #2 flight attendant stated that he heard the TCASII warning, felt the climb, and visually saw the single engine aircraft pass very near and slightly below us. Talked to tower supervisor and he stated that this is a fairly common occurrence with traffic at pearson, and that the traffic was in legal airspace. He stated the GA aircraft intentions were to depart northwest and that he thought the pilot decided visibility was too poor so stayed in the pattern and landed.

Original NASA ASRS Text

Title: B737 LNDG RWY 10 AT PDX EXPERIENCED TCASII RA WITH ATC ISSUED TFC.

Narrative: PDX WX 24 BROKEN, 35 OVCST 7-R 5 DEGS/4 DEGS 100-9 ILS RWYS 10L AND 10R IN USE. VISIBILITY LOWER TO THE W. APCH CTL: 'MAINTAIN 2000 FT TILL ESTABLISHED, CLRED FOR ILS RWY 10L. TFC 10 O'CLOCK POS, 6 MI, PROBABLY JUST OFF OF PEARSON AIRPARK.' TWR, 'CLRED TO LAND RWY 10L,' PLUS TFC RPT. US, 'IMC IN AND OUT OF THE BASES AND RAIN.' TCASII RA AT 800 FT AGL. TARGET SHOWED 600 FT ON TCASII. FO DISENGAGED AUTOPLT AND EXECUTED EVASIVE ACTION IN COMPLIANCE WITH RA TO 1200 FT AGL. AS WE PASSED CLR OF CONFLICT WE BROKE OUT OF THE CLOUDS AND MADE A NORMAL VISUAL APCH AND UNEVENTFUL LNDG. AFTER LNDG, #2 FLT ATTENDANT STATED THAT HE HEARD THE TCASII WARNING, FELT THE CLB, AND VISUALLY SAW THE SINGLE ENG ACFT PASS VERY NEAR AND SLIGHTLY BELOW US. TALKED TO TWR SUPVR AND HE STATED THAT THIS IS A FAIRLY COMMON OCCURRENCE WITH TFC AT PEARSON, AND THAT THE TFC WAS IN LEGAL AIRSPACE. HE STATED THE GA ACFT INTENTIONS WERE TO DEPART NW AND THAT HE THOUGHT THE PLT DECIDED VISIBILITY WAS TOO POOR SO STAYED IN THE PATTERN AND LANDED.

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.