Narrative:

Air carrier X was issued the angel 1 SID via ACARS. Air carrier X departed runway 25R and was observed by the south ground controller (ground controller #1) executing a right turn at approximately 1000 ft MSL. The correct departure procedure for this SID when departing runway 25R is: runway heading until the smo 160 degree radial, then turn left heading 220 degrees. The south local controller (local controller #1) immediately issued a left turn to air carrier X to avoid a conflict with an MD80 that departed runway 24L on a 250 degree heading. The closest distance was approximately 3500 ft horizontal, 3000 ft lateral and zero ft vertical. (The ctrlines of runway 25R and runway 24L are separated by a little more than 4300 ft.) this is not the first time that there have been issues with an aircraft that has departed runway 25R on the angel 1 SID executing a right turn at approximately 1000 ft MSL. Air carrier Y no longer utilizes the angel 1 SID due to several incidents of the same nature with its B757 and B767 fleet. Air carrier Z has experienced several incidents of this nature with its B757 and B767 fleet in the past several months. These events have been documented to an extent on the facility daily log. Callback conversation with reporter revealed the following information: tower specialist advised there have been no recent reports of FMS SID deviations. The specialist advised that some air carrier's have withdrawn from SID usage. One possible reason provided by the users for incorrect directional turning was that the FMS seemed to search the FMS director for the correct runway with its associated waypoints, that the runways and waypoints were too close together and in too short proximity to the runway departure end to correctly and efficiently identify which route it was to fly. The FMS could eventually sort this out, but timing was insufficient due to controller traffic and workload off both runway complexes. The specialist advised that the FMS procedures were under review.

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Original NASA ASRS Text

Title: LAX GND CTLR ALERTS LCL CTLR ON DEPARTING RWY 25R B767 DEVIATING FROM SID, CONFLICTING WITH MD80 DEPARTING FROM RWY 24L.

Narrative: ACR X WAS ISSUED THE ANGEL 1 SID VIA ACARS. ACR X DEPARTED RWY 25R AND WAS OBSERVED BY THE S GND CTLR (GND CTLR #1) EXECUTING A R TURN AT APPROX 1000 FT MSL. THE CORRECT DEP PROC FOR THIS SID WHEN DEPARTING RWY 25R IS: RWY HDG UNTIL THE SMO 160 DEG RADIAL, THEN TURN L HDG 220 DEGS. THE S LCL CTLR (LCL CTLR #1) IMMEDIATELY ISSUED A L TURN TO ACR X TO AVOID A CONFLICT WITH AN MD80 THAT DEPARTED RWY 24L ON A 250 DEG HDG. THE CLOSEST DISTANCE WAS APPROX 3500 FT HORIZ, 3000 FT LATERAL AND ZERO FT VERT. (THE CTRLINES OF RWY 25R AND RWY 24L ARE SEPARATED BY A LITTLE MORE THAN 4300 FT.) THIS IS NOT THE FIRST TIME THAT THERE HAVE BEEN ISSUES WITH AN ACFT THAT HAS DEPARTED RWY 25R ON THE ANGEL 1 SID EXECUTING A R TURN AT APPROX 1000 FT MSL. ACR Y NO LONGER UTILIZES THE ANGEL 1 SID DUE TO SEVERAL INCIDENTS OF THE SAME NATURE WITH ITS B757 AND B767 FLEET. ACR Z HAS EXPERIENCED SEVERAL INCIDENTS OF THIS NATURE WITH ITS B757 AND B767 FLEET IN THE PAST SEVERAL MONTHS. THESE EVENTS HAVE BEEN DOCUMENTED TO AN EXTENT ON THE FACILITY DAILY LOG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: TWR SPECIALIST ADVISED THERE HAVE BEEN NO RECENT RPTS OF FMS SID DEVS. THE SPECIALIST ADVISED THAT SOME ACR'S HAVE WITHDRAWN FROM SID USAGE. ONE POSSIBLE REASON PROVIDED BY THE USERS FOR INCORRECT DIRECTIONAL TURNING WAS THAT THE FMS SEEMED TO SEARCH THE FMS DIRECTOR FOR THE CORRECT RWY WITH ITS ASSOCIATED WAYPOINTS, THAT THE RWYS AND WAYPOINTS WERE TOO CLOSE TOGETHER AND IN TOO SHORT PROX TO THE RWY DEP END TO CORRECTLY AND EFFICIENTLY IDENT WHICH RTE IT WAS TO FLY. THE FMS COULD EVENTUALLY SORT THIS OUT, BUT TIMING WAS INSUFFICIENT DUE TO CTLR TFC AND WORKLOAD OFF BOTH RWY COMPLEXES. THE SPECIALIST ADVISED THAT THE FMS PROCS WERE UNDER REVIEW.

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.