Narrative:

We were on a downwind radar vector to final approach to san diego lindbergh field. Operation was in the clear on top of an undercast deck of clouds with excellent visibility. We were on a heading of 090 degree, level and 7000', and high on the profile. We were anticipating a descent and a turn to base leg. The controller was handling about 8 aircraft including 3 other same company aircraft. We were xxyy, san francisco to san diego, and the last in the string of 8 aircraft on approach. We were on frequency 124.35. The controller gave us a right turn to 150 degree and a descent to 5000. We began the turn and the descent after I acknowledged the complete clearance and read it back to him. At 6500' the controller apparently noticed that we were complying with an erroneous clearance. He directed us to maintain 7000, turn left back to heading of 090 degree and pointed out traffic at 1 O'clock and 3 or 4 mi. We saw the traffic. It was no factor. The controller said that we complied with a clearance that was for our same company aircraft. To add to the confusion, another same company aircraft was answering for our clrncs.

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Original NASA ASRS Text

Title: XXCO ACFT ON SAN APCH PROC ALONG WITH 3 OTHER XXCO ACFT, RECEIVED AND READ BACK CLRNC TO DESCEND AND TURN. APCH CTLR INTERVENED, CLRNC WAS FOR ANOTHER ACFT.

Narrative: WE WERE ON A DOWNWIND RADAR VECTOR TO FINAL APCH TO SAN DIEGO LINDBERGH FIELD. OPERATION WAS IN THE CLEAR ON TOP OF AN UNDERCAST DECK OF CLOUDS WITH EXCELLENT VISIBILITY. WE WERE ON A HDG OF 090 DEG, LEVEL AND 7000', AND HIGH ON THE PROFILE. WE WERE ANTICIPATING A DSCNT AND A TURN TO BASE LEG. THE CTLR WAS HANDLING ABOUT 8 ACFT INCLUDING 3 OTHER SAME COMPANY ACFT. WE WERE XXYY, SAN FRANCISCO TO SAN DIEGO, AND THE LAST IN THE STRING OF 8 ACFT ON APCH. WE WERE ON FREQ 124.35. THE CTLR GAVE US A RIGHT TURN TO 150 DEG AND A DSCNT TO 5000. WE BEGAN THE TURN AND THE DSCNT AFTER I ACKNOWLEDGED THE COMPLETE CLRNC AND READ IT BACK TO HIM. AT 6500' THE CTLR APPARENTLY NOTICED THAT WE WERE COMPLYING WITH AN ERRONEOUS CLRNC. HE DIRECTED US TO MAINTAIN 7000, TURN LEFT BACK TO HDG OF 090 DEG AND POINTED OUT TFC AT 1 O'CLOCK AND 3 OR 4 MI. WE SAW THE TFC. IT WAS NO FACTOR. THE CTLR SAID THAT WE COMPLIED WITH A CLRNC THAT WAS FOR OUR SAME COMPANY ACFT. TO ADD TO THE CONFUSION, ANOTHER SAME COMPANY ACFT WAS ANSWERING FOR OUR CLRNCS.

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.