TCASII near midair collision.

Attributes
ACN	284101
Time
Date	199409
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sea
State Reference	WA
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : 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 descent other landing other
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	descent : approach
Route In Use	approach : visual
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 17500 flight time type : 700
ASRS Report	284101
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Problem is vectoring aircraft for visual approachs on parallel runways side by side. The other pilot said we were in sight yet he was doing 250 KTS, 10 mi out, flew under us during our descending for landing and not getting out of way. Our TCASII saved a lot of people's lives today! Didn't know of problem until warned by TCASII. Controller didn't keep enough separation nor warn us when separation is close. Frequency was very congested so I was unable to query ATC.

Original NASA ASRS Text

Title: TCASII NMAC.

Narrative: PROB IS VECTORING ACFT FOR VISUAL APCHS ON PARALLEL RWYS SIDE BY SIDE. THE OTHER PLT SAID WE WERE IN SIGHT YET HE WAS DOING 250 KTS, 10 MI OUT, FLEW UNDER US DURING OUR DSNDING FOR LNDG AND NOT GETTING OUT OF WAY. OUR TCASII SAVED A LOT OF PEOPLE'S LIVES TODAY! DIDN'T KNOW OF PROB UNTIL WARNED BY TCASII. CTLR DIDN'T KEEP ENOUGH SEPARATION NOR WARN US WHEN SEPARATION IS CLOSE. FREQ WAS VERY CONGESTED SO I WAS UNABLE TO QUERY ATC.

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.