B737-400 ferry crew receives a TCASII RA during a vectored visual parallel approach to sea. PIC leveled aircraft for a period and continued approach. Other aircraft about 500 ft below but to the right.

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Attributes
ACN	384690
Time
Date	199711
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sea
State Reference	WA
Altitude	msl bound lower : 3500 msl bound upper : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sea
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	approach : visual arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	F28 Mk 1000
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other
Route In Use	approach : visual arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 7100 flight time type : 450
ASRS Report	384690
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 2000
ASRS Report	384504
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 500
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

While being vectored for a visual at the seattle/tacoma airport we experienced a TCASII RA between 4000 and 3000 ft MSL. The captain leveled off following the advisory and the aircraft was acquired visually underneath us and to the right. Normal procedures were resumed. Visual approachs were in use for both runways 16R/16L at seatac.

Original NASA ASRS Text

Title: B737-400 FERRY CREW RECEIVES A TCASII RA DURING A VECTORED VISUAL PARALLEL APCH TO SEA. PIC LEVELED ACFT FOR A PERIOD AND CONTINUED APCH. OTHER ACFT ABOUT 500 FT BELOW BUT TO THE R.

Narrative: WHILE BEING VECTORED FOR A VISUAL AT THE SEATTLE/TACOMA ARPT WE EXPERIENCED A TCASII RA BTWN 4000 AND 3000 FT MSL. THE CAPT LEVELED OFF FOLLOWING THE ADVISORY AND THE ACFT WAS ACQUIRED VISUALLY UNDERNEATH US AND TO THE R. NORMAL PROCS WERE RESUMED. VISUAL APCHS WERE IN USE FOR BOTH RWYS 16R/16L AT SEATAC.

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.