Narrative:

I requested IFR termination, and a VFR divert to point mugu. I was instructed to squawk 1200, and to maintain VFR. I contacted camarillo tower (128.2) at the base of the conejo grade. I asked for and received permission to 'transmit the cma air traffic area at or above 2000 ft.' I then proceeded towards pt. Mugu. Approximately 2 mi northeast of round mountain, cma gave me a frequency change to mugu tower. I contacted mugu tower on 124.89. I advised them that I 'was just outside round mountain, 1.3 descending to 700 ft, full stop, negative ATIS.' mugu instructed me to report 1 mi right base to runway 27. While in my descent, I saw a white and blue small aircraft going left to right, approximately 50 ft lower than I, approximately 300 ft in front of me. I made a sharp left break to miss him, and reported the incident to mugu tower. It appeared that this small aircraft flew down the canyons behind the vtu VORTAC, possibly violating pt. Mugu's air traffic area. It was not issued as traffic. Supplemental information from acn 202932: failure of other aircraft to follow prescribed pattern entry technique. Callback conversation with reporter revealed the following information: call back made due to brevity of report. Determined it is a match of 202789. Reporter states conflict occurred at 4 mi on 030 line of position from ntd. Reporter aircraft had been cleared for this entry. Ntd has 3 entry for traffic pattern entry at 700 ft. Reporter aircraft communication with approach, cma tower, then ntd tower. Intruder aircraft not in contact with anyone. Apparently trying to avoid contact with ntd but at conflict point inside cma air traffic area as well. Not proper entry for cma traffic pattern. Too close for comfort.

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Original NASA ASRS Text

Title: SMA ON BASE FOR LNDG HAS NMAC WITH SMA AT LOW ALT. EVASIVE ACTION.

Narrative: I REQUESTED IFR TERMINATION, AND A VFR DIVERT TO POINT MUGU. I WAS INSTRUCTED TO SQUAWK 1200, AND TO MAINTAIN VFR. I CONTACTED CAMARILLO TWR (128.2) AT THE BASE OF THE CONEJO GRADE. I ASKED FOR AND RECEIVED PERMISSION TO 'XMIT THE CMA ATA AT OR ABOVE 2000 FT.' I THEN PROCEEDED TOWARDS PT. MUGU. APPROX 2 MI NE OF ROUND MOUNTAIN, CMA GAVE ME A FREQ CHANGE TO MUGU TWR. I CONTACTED MUGU TWR ON 124.89. I ADVISED THEM THAT I 'WAS JUST OUTSIDE ROUND MOUNTAIN, 1.3 DSNDING TO 700 FT, FULL STOP, NEGATIVE ATIS.' MUGU INSTRUCTED ME TO RPT 1 MI R BASE TO RWY 27. WHILE IN MY DSCNT, I SAW A WHITE AND BLUE SMA GOING L TO R, APPROX 50 FT LOWER THAN I, APPROX 300 FT IN FRONT OF ME. I MADE A SHARP L BREAK TO MISS HIM, AND RPTED THE INCIDENT TO MUGU TWR. IT APPEARED THAT THIS SMA FLEW DOWN THE CANYONS BEHIND THE VTU VORTAC, POSSIBLY VIOLATING PT. MUGU'S ATA. IT WAS NOT ISSUED AS TFC. SUPPLEMENTAL INFO FROM ACN 202932: FAILURE OF OTHER ACFT TO FOLLOW PRESCRIBED PATTERN ENTRY TECHNIQUE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALL BACK MADE DUE TO BREVITY OF RPT. DETERMINED IT IS A MATCH OF 202789. RPTR STATES CONFLICT OCCURRED AT 4 MI ON 030 LINE OF POS FROM NTD. RPTR ACFT HAD BEEN CLRED FOR THIS ENTRY. NTD HAS 3 ENTRY FOR TFC PATTERN ENTRY AT 700 FT. RPTR ACFT COM WITH APCH, CMA TWR, THEN NTD TWR. INTRUDER ACFT NOT IN CONTACT WITH ANYONE. APPARENTLY TRYING TO AVOID CONTACT WITH NTD BUT AT CONFLICT POINT INSIDE CMA ATA AS WELL. NOT PROPER ENTRY FOR CMA TFC PATTERN. TOO CLOSE FOR COMFORT.

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.