Diamond DA40 on IFR vectors has near midair collision with an opposite directions cessna.

Attributes
ACN	824289
Time
Date	200902
Local Time Of Day	0601-1200
Place
Locale Reference	S46.TRACON
State Reference	WA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	DA40 Diamond Star
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Climb
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument
Experience	Flight Crew Last 90 Days 10 Flight Crew Total 250 Flight Crew Type 80
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 0 Vertical 200

Narrative:

While being vectored to intercept the localizer; our tis gave traffic warning just before we saw a cessna type aircraft pass just underneath; opposite direction. No advisory from controller. I think either the controller was over saturated; or the other airplane did not have an operating transponder. The controller did not say anything to me and I did not report it to him.

Original NASA ASRS Text

Title: Diamond DA40 on IFR vectors has NMAC with an opposite directions Cessna.

Narrative: While being vectored to intercept the LOC; our TIS gave traffic warning just before we saw a Cessna type aircraft pass just underneath; opposite direction. No advisory from Controller. I think either the Controller was over saturated; or the other airplane did not have an operating transponder. The Controller did not say anything to me and I did not report it to him.

Data retrieved from NASA's ASRS site as of April 2012 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.