Flight crew receives TCASII RA during VFR approach.

Attributes
ACN	548468
Time
Date	200205
Day	Sat
Place
Locale Reference	airport : sea.airport
State Reference	WA
Altitude	agl single value : 1000
Aircraft 1
Controlling Facilities	tracon : s46.tracon tower : sea.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	landing : go around
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : sea.tower
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	548468
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : took evasive action flight crew : executed go around
Consequence	faa : reviewed incident with flight crew other
Supplementary
Problem Areas	Airspace Structure ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

On final approach into sea on runway 16L we were advised by approach control that we had traffic for the parallel runway 16R at our 3 O'clock position. We advised that we did not have the traffic in sight. Once we switched to tower control they also called the traffic and they were advised that we still did not have them in sight. The traffic did claim to have us in sight. At approximately 1000 ft AGL we received a TA which very quickly turned into an RA commanding an immediate climb. The captain executed a go around and tower was advised that we were responding to the RA. We were given vectors back around to land on runway 16R and landed without incident. With the close proximity of the runways there needs to be some additional spacing to prevent this from occurring. It is impossible to see traffic at our 3 O'clock position slightly lower than us and it is unsafe to assume they will maintain separation when we get an RA.

Original NASA ASRS Text

Title: FLC RECEIVES TCASII RA DURING VFR APCH.

Narrative: ON FINAL APCH INTO SEA ON RWY 16L WE WERE ADVISED BY APCH CTL THAT WE HAD TFC FOR THE PARALLEL RWY 16R AT OUR 3 O'CLOCK POS. WE ADVISED THAT WE DID NOT HAVE THE TFC IN SIGHT. ONCE WE SWITCHED TO TWR CTL THEY ALSO CALLED THE TFC AND THEY WERE ADVISED THAT WE STILL DID NOT HAVE THEM IN SIGHT. THE TFC DID CLAIM TO HAVE US IN SIGHT. AT APPROX 1000 FT AGL WE RECEIVED A TA WHICH VERY QUICKLY TURNED INTO AN RA COMMANDING AN IMMEDIATE CLB. THE CAPT EXECUTED A GAR AND TWR WAS ADVISED THAT WE WERE RESPONDING TO THE RA. WE WERE GIVEN VECTORS BACK AROUND TO LAND ON RWY 16R AND LANDED WITHOUT INCIDENT. WITH THE CLOSE PROX OF THE RWYS THERE NEEDS TO BE SOME ADDITIONAL SPACING TO PREVENT THIS FROM OCCURRING. IT IS IMPOSSIBLE TO SEE TFC AT OUR 3 O'CLOCK POS SLIGHTLY LOWER THAN US AND IT IS UNSAFE TO ASSUME THEY WILL MAINTAIN SEPARATION WHEN WE GET AN RA.

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.