While in a TCA the reporter aircraft had an near midair collision with an unidentified GA aircraft flying in the TCA without clearance or communication.

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Attributes
ACN	106719
Time
Date	198903
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : smo
State Reference	CA
Altitude	msl bound lower : 5200 msl bound upper : 5200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 120 flight time total : 2600 flight time type : 120
ASRS Report	106719
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 200 vertical : 0
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

While direct to smo VOR 7000' down to 5000' on lax approach frequency 124.5, at approximately 5200' I observed an small aircraft at our 3 O'clock position coalt at approximately 200' in a 10 to 15 degree left turn. The aircraft passed within 100' to our rear and we lost contact with that aircraft. I immediately contacted ATC lax approach channel 124.5, informed them and their reply was 'negative traffic in that area.' out flight continued uneventfully.

Original NASA ASRS Text

Title: WHILE IN A TCA THE REPORTER ACFT HAD AN NMAC WITH AN UNIDENTIFIED GA ACFT FLYING IN THE TCA WITHOUT CLRNC OR COM.

Narrative: WHILE DIRECT TO SMO VOR 7000' DOWN TO 5000' ON LAX APCH FREQ 124.5, AT APPROX 5200' I OBSERVED AN SMA AT OUR 3 O'CLOCK POSITION COALT AT APPROX 200' IN A 10 TO 15 DEG L TURN. THE ACFT PASSED WITHIN 100' TO OUR REAR AND WE LOST CONTACT WITH THAT ACFT. I IMMEDIATELY CONTACTED ATC LAX APCH CHANNEL 124.5, INFORMED THEM AND THEIR REPLY WAS 'NEGATIVE TFC IN THAT AREA.' OUT FLT CONTINUED UNEVENTFULLY.

Data retrieved from NASA's ASRS site as of August 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.