Narrative:

While flying assigned route along V388 to intersect V283; the controller asked us to be prepared for the baset 2 arrival. I pulled out the chart and he asked us to find cacts intersection. He then asked us to find pdz VOR. We acknowledged the VOR and he cleared us direct to the VOR. While this discussion was going on and before we could punch in the fix; the aircraft made a 90 degree left turn following the previous cleared route. The controller made a transmission that was blocked by another aircraft. I keyed the microphone and said 'blocked;' to which he replied; 'air carrier XXX; turn right immediately; immediate right turn. Air carrier XXX to a heading of 330 degrees; traffic less than 1 mi gulfstream 6 at approximately 12500 ft.' my first officer; who was flying; immediately banked hard right to the heading. After turning to the heading; he again cleared us direct to the VOR. No other discussion was made. After landing; I called my company and then called socal approach control and spoke with mr X. They had already looked into the incident and said we were flying the correct route. The controller thought we had been given another route and as far as they were concerned we had passed no closer than 3 mi and that was the end of the matter. While flying in the lax area; I've noticed on numerous occasions several rertes mid-flight. This greatly adds to confusion over your cleared route and pilot workload.

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Original NASA ASRS Text

Title: A CE560 PLT EXPERIENCED A CLOSE ENCOUNTER IN SOCAL AIRSPACE WHEN THE ACFT CONTINUED ITS ORIGINAL CLRNC WHILE ATTEMPTING TO PROGRAM A REVISED ROUTING TO LAX.

Narrative: WHILE FLYING ASSIGNED RTE ALONG V388 TO INTERSECT V283; THE CTLR ASKED US TO BE PREPARED FOR THE BASET 2 ARR. I PULLED OUT THE CHART AND HE ASKED US TO FIND CACTS INTXN. HE THEN ASKED US TO FIND PDZ VOR. WE ACKNOWLEDGED THE VOR AND HE CLRED US DIRECT TO THE VOR. WHILE THIS DISCUSSION WAS GOING ON AND BEFORE WE COULD PUNCH IN THE FIX; THE ACFT MADE A 90 DEG L TURN FOLLOWING THE PREVIOUS CLRED RTE. THE CTLR MADE A XMISSION THAT WAS BLOCKED BY ANOTHER ACFT. I KEYED THE MIKE AND SAID 'BLOCKED;' TO WHICH HE REPLIED; 'ACR XXX; TURN R IMMEDIATELY; IMMEDIATE R TURN. ACR XXX TO A HDG OF 330 DEGS; TFC LESS THAN 1 MI GULFSTREAM 6 AT APPROX 12500 FT.' MY FO; WHO WAS FLYING; IMMEDIATELY BANKED HARD R TO THE HDG. AFTER TURNING TO THE HDG; HE AGAIN CLRED US DIRECT TO THE VOR. NO OTHER DISCUSSION WAS MADE. AFTER LNDG; I CALLED MY COMPANY AND THEN CALLED SOCAL APCH CTL AND SPOKE WITH MR X. THEY HAD ALREADY LOOKED INTO THE INCIDENT AND SAID WE WERE FLYING THE CORRECT RTE. THE CTLR THOUGHT WE HAD BEEN GIVEN ANOTHER RTE AND AS FAR AS THEY WERE CONCERNED WE HAD PASSED NO CLOSER THAN 3 MI AND THAT WAS THE END OF THE MATTER. WHILE FLYING IN THE LAX AREA; I'VE NOTICED ON NUMEROUS OCCASIONS SEVERAL RERTES MID-FLT. THIS GREATLY ADDS TO CONFUSION OVER YOUR CLRED RTE AND PLT WORKLOAD.

Data retrieved from NASA's ASRS site as of January 2009 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.