Narrative:

There is a documented and repeated error in the navigation software of airbus aircraft which causes the plane to turn far too early at fixes. An A319 departed las on the wyldd 1 departure. Approximately 6-8 mi west of wyldd, the aircraft began its turn to pgs -- never getting less than 3 mi from pgs (a point on air carrier X's flight plan). Controllers use lateral route separation to separate aircraft on the wyldd 1 departure and mirok 1 arrival. The amount and earliness of airbus turns at wyldd exceed the 4 mi either side of course protected airspace resulting in a pilot deviation in each and every instance. This is a dangerous situation and airbus needs to be forced to rewrite their software to comply with air traffic requirements and needs.

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Original NASA ASRS Text

Title: ZLA CTLR CONCERNED WITH A319 FMC SYS PROGRAMMING WHICH PROGRAMS ACFT TURNS AT A POINT THAT VARIES FROM OTHER ACFT MANUFACTURER'S SYS.

Narrative: THERE IS A DOCUMENTED AND REPEATED ERROR IN THE NAV SOFTWARE OF AIRBUS ACFT WHICH CAUSES THE PLANE TO TURN FAR TOO EARLY AT FIXES. AN A319 DEPARTED LAS ON THE WYLDD 1 DEP. APPROX 6-8 MI W OF WYLDD, THE ACFT BEGAN ITS TURN TO PGS -- NEVER GETTING LESS THAN 3 MI FROM PGS (A POINT ON ACR X'S FLT PLAN). CTLRS USE LATERAL RTE SEPARATION TO SEPARATE ACFT ON THE WYLDD 1 DEP AND MIROK 1 ARR. THE AMOUNT AND EARLINESS OF AIRBUS TURNS AT WYLDD EXCEED THE 4 MI EITHER SIDE OF COURSE PROTECTED AIRSPACE RESULTING IN A PLTDEV IN EACH AND EVERY INSTANCE. THIS IS A DANGEROUS SIT AND AIRBUS NEEDS TO BE FORCED TO REWRITE THEIR SOFTWARE TO COMPLY WITH AIR TFC REQUIREMENTS AND NEEDS.

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.