Narrative:

VFR maintenance test flight which departed boeing field, seattle, wa proceeding to a location approximately 25 to 30 mi northwest of seattle. Aircraft remained clear of the seattle TCA and tacoma- mcchord TRSA and climbed to 13500 ft in good VFR conditions. After completing maintenance checks, I began a VFR descent to return to boeing field for landing. No contact was made with seattle approach control during this maintenance flight. Descent placed my aircraft at 2500 ft approximately 22 mi northwest of sea VOR or 4 to 5 mi northwest of the city of bremerton, wa to ensure I would be below the TCA. Descent was made VFR with WX conditions estimated at 4000 ft to 5000 ft scattered with visibility north and south 5 mi, east more than 30 mi. At approximately 3 mi east of bremerton at 2500 ft, I contacted boeing field tower and requested landing instructions. Boeing tower asked if I had traffic off my left wing. After looking in that direction and seeing nothing, I replied negative. After landing at boeing field, I was requested to call sea approach control. Upon contact, a controller stated that as I was transitioning the northwest area of bremerton a small aircraft aircraft was being vectored by sea approach control for the ILS approach to bremerton national airport, an uncontrolled airfield. The small aircraft aircraft evidently stated that our aircraft came in close proximity to each other and that he had to maneuver to avoid my aircraft. The controller did not know whether the pilot of the small aircraft aircraft would file a near miss report. Both aircraft were in excellent VFR conditions at the time, and outside any positive controled airspace (TCA or TRSA). I did not see this aircraft at any time and also do not know what advisories the small aircraft was given by sea approach control since he was being vectored and my transponder was operative on 1200 with mode C activated. Obviously, this was a hazardous situation since VFR conditions existed and both aircraft are required to avoid each other even though 1 is being controled by ATC. Far 91.113 (B).

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Original NASA ASRS Text

Title: PLT OF SMT ACFT WAS ADVISED BY ATC AFTER LNDG THAT ANOTHER ACFT TOOK EVASIVE ACTION TO MISS HIS ACFT DURING VECTOR FOR AN APCH TO AN UNCTLED ARPT OUTSIDE THE NEARBY TCA RESULTING IN A NMAC.

Narrative: VFR MAINT TEST FLT WHICH DEPARTED BOEING FIELD, SEATTLE, WA PROCEEDING TO A LOCATION APPROX 25 TO 30 MI NW OF SEATTLE. ACFT REMAINED CLR OF THE SEATTLE TCA AND TACOMA- MCCHORD TRSA AND CLBED TO 13500 FT IN GOOD VFR CONDITIONS. AFTER COMPLETING MAINT CHKS, I BEGAN A VFR DSCNT TO RETURN TO BOEING FIELD FOR LNDG. NO CONTACT WAS MADE WITH SEATTLE APCH CTL DURING THIS MAINT FLT. DSCNT PLACED MY ACFT AT 2500 FT APPROX 22 MI NW OF SEA VOR OR 4 TO 5 MI NW OF THE CITY OF BREMERTON, WA TO ENSURE I WOULD BE BELOW THE TCA. DSCNT WAS MADE VFR WITH WX CONDITIONS ESTIMATED AT 4000 FT TO 5000 FT SCATTERED WITH VISIBILITY N AND S 5 MI, E MORE THAN 30 MI. AT APPROX 3 MI E OF BREMERTON AT 2500 FT, I CONTACTED BOEING FIELD TWR AND REQUESTED LNDG INSTRUCTIONS. BOEING TWR ASKED IF I HAD TFC OFF MY L WING. AFTER LOOKING IN THAT DIRECTION AND SEEING NOTHING, I REPLIED NEGATIVE. AFTER LNDG AT BOEING FIELD, I WAS REQUESTED TO CALL SEA APCH CTL. UPON CONTACT, A CTLR STATED THAT AS I WAS TRANSITIONING THE NW AREA OF BREMERTON A SMA ACFT WAS BEING VECTORED BY SEA APCH CTL FOR THE ILS APCH TO BREMERTON NATIONAL ARPT, AN UNCTLED AIRFIELD. THE SMA ACFT EVIDENTLY STATED THAT OUR ACFT CAME IN CLOSE PROX TO EACH OTHER AND THAT HE HAD TO MANEUVER TO AVOID MY ACFT. THE CTLR DID NOT KNOW WHETHER THE PLT OF THE SMA ACFT WOULD FILE A NEAR MISS RPT. BOTH ACFT WERE IN EXCELLENT VFR CONDITIONS AT THE TIME, AND OUTSIDE ANY POSITIVE CTLED AIRSPACE (TCA OR TRSA). I DID NOT SEE THIS ACFT AT ANY TIME AND ALSO DO NOT KNOW WHAT ADVISORIES THE SMA WAS GIVEN BY SEA APCH CTL SINCE HE WAS BEING VECTORED AND MY TRANSPONDER WAS OPERATIVE ON 1200 WITH MODE C ACTIVATED. OBVIOUSLY, THIS WAS A HAZARDOUS SITUATION SINCE VFR CONDITIONS EXISTED AND BOTH ACFT ARE REQUIRED TO AVOID EACH OTHER EVEN THOUGH 1 IS BEING CTLED BY ATC. FAR 91.113 (B).

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.