Near midair collision between a reporting beech BE18 transiting through the departure airspace, 3 mi south, and a british jetstream climbing out after departure. ATC issued a TA and the reporter took evasive action by descending after observing the flight path of the other aircraft.

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Attributes
ACN	386899
Time
Date	199711
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sna
State Reference	CA
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sna
Operator	other
Make Model Name	Twin Beech 18
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	VFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Jetstream 31
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	other other : other pilot : atp pilot : instrument
Experience	flight time last 90 days : 300 flight time total : 3500 flight time type : 1500
ASRS Report	386899
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 300 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We were flying a pass at 1500 ft eastbound about 3 mi south of sna. Traffic was called to us at 11 O'clock and about 1 mi climbing out of 1100 ft. We reported looking and when we saw the jetstream he was at 12 O'clock about 1/2 mi climbing through 1500 ft. We descended below him and continued on our course once clear of traffic.

Original NASA ASRS Text

Title: NMAC BTWN A RPTING BEECH BE18 TRANSITING THROUGH THE DEP AIRSPACE, 3 MI S, AND A BRITISH JETSTREAM CLBING OUT AFTER DEP. ATC ISSUED A TA AND THE RPTR TOOK EVASIVE ACTION BY DSNDING AFTER OBSERVING THE FLT PATH OF THE OTHER ACFT.

Narrative: WE WERE FLYING A PASS AT 1500 FT EBOUND ABOUT 3 MI S OF SNA. TFC WAS CALLED TO US AT 11 O'CLOCK AND ABOUT 1 MI CLBING OUT OF 1100 FT. WE RPTED LOOKING AND WHEN WE SAW THE JETSTREAM HE WAS AT 12 O'CLOCK ABOUT 1/2 MI CLBING THROUGH 1500 FT. WE DSNDED BELOW HIM AND CONTINUED ON OUR COURSE ONCE CLR OF TFC.

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.