Narrative:

I have a computer program that prints a flight plan for flts via VOR's or RNAV direct. Using it for the first time in RNAV direct mode, I flew form sjc to avx with RNAV waypoints from sns, ave and vtu. Nearing my vtu waypoint I noticed an medium large transport approaching head-on at about 1 mi. I was monitoring 125.2 (coast approach could not give VFR advisories) but heard no alert. I turned to the right to avoid but the medium large transport initiated a turn to his left to track me! I made a 60 degree bank to avoid him and we passed within 500' horizontal. It didn't appear that he ever saw me. After this I thought to check my position relative to lax. I was at 18 DME. I made a right turn to 270 degrees. The checking position relative to vtu (the TCA's edge is defined by the 075 degree right), I was at 080 degrees, inside the TCA. I made a bee line to exit. Further investigation revealed that I had set my vtu waypoint at 16 NM rather than 1.6. Callback conversation with reporter revealed the following: reporter stated the 075 degree right defines the north boundary of the TCA. The 16 NM he set from vtu instead of 1.6 NM, put him well within the 20 NM ring of the TCA. The near midair collision caused him to reevaluate his position.

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Original NASA ASRS Text

Title: SMA PLT PROGRAMS WRONG DISTANCE AS RNAV WAYPOINT. PENETRATES TCA. NMAC WITH MLG.

Narrative: I HAVE A COMPUTER PROGRAM THAT PRINTS A FLT PLAN FOR FLTS VIA VOR'S OR RNAV DIRECT. USING IT FOR THE FIRST TIME IN RNAV DIRECT MODE, I FLEW FORM SJC TO AVX WITH RNAV WAYPOINTS FROM SNS, AVE AND VTU. NEARING MY VTU WAYPOINT I NOTICED AN MLG APCHING HEAD-ON AT ABOUT 1 MI. I WAS MONITORING 125.2 (COAST APCH COULD NOT GIVE VFR ADVISORIES) BUT HEARD NO ALERT. I TURNED TO THE RIGHT TO AVOID BUT THE MLG INITIATED A TURN TO HIS LEFT TO TRACK ME! I MADE A 60 DEG BANK TO AVOID HIM AND WE PASSED WITHIN 500' HORIZ. IT DIDN'T APPEAR THAT HE EVER SAW ME. AFTER THIS I THOUGHT TO CHK MY POS RELATIVE TO LAX. I WAS AT 18 DME. I MADE A RIGHT TURN TO 270 DEGS. THE CHKING POS RELATIVE TO VTU (THE TCA'S EDGE IS DEFINED BY THE 075 DEG R), I WAS AT 080 DEGS, INSIDE THE TCA. I MADE A BEE LINE TO EXIT. FURTHER INVESTIGATION REVEALED THAT I HAD SET MY VTU WAYPOINT AT 16 NM RATHER THAN 1.6. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR STATED THE 075 DEG R DEFINES THE N BOUNDARY OF THE TCA. THE 16 NM HE SET FROM VTU INSTEAD OF 1.6 NM, PUT HIM WELL WITHIN THE 20 NM RING OF THE TCA. THE NMAC CAUSED HIM TO REEVALUATE HIS POS.

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.