Narrative:

Aircraft X departed dtw on the MAARS2 departure. Aircraft Y was inbound to cle on the himez arrival. While I was coordinating with yyz I noticed aircraft X made a turn sbound toward aircraft Y. I immediately hung up from yyz and turned aircraft X to an east heading trying to keep separation. I also asked for altitude reports. I then asked aircraft X about his cleared routing and read the pilot deviation card with the phone number to call. To the best of my knowledge dtw approach issued the correct route. The pilot thought he was flying the correct route but the autoplt turned direct air after maars instead of flying the whole maars departure over aco. This has happened numerous times in the past not just to me but to other controllers. I was told by an operations manager that the problem is with a foreign made FMS software. In the past the controllers have caught and corrected the deviation before an accident. If this is not corrected I fear a midair collision could happen. A solution could be not to let airplanes with this FMS fly the maars departure until this is fixed!

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Original NASA ASRS Text

Title: ZOB CTLR DESCRIBED CONFLICT EVENT AT 14;500 WHEN DEP FAILED TO CONFORM TO DEP PROC; INDICATING FMS SOFTWARE AS LIKELY CAUSAL FACTOR.

Narrative: ACFT X DEPARTED DTW ON THE MAARS2 DEP. ACFT Y WAS INBOUND TO CLE ON THE HIMEZ ARR. WHILE I WAS COORDINATING WITH YYZ I NOTICED ACFT X MADE A TURN SBOUND TOWARD ACFT Y. I IMMEDIATELY HUNG UP FROM YYZ AND TURNED ACFT X TO AN E HDG TRYING TO KEEP SEPARATION. I ALSO ASKED FOR ALT RPTS. I THEN ASKED ACFT X ABOUT HIS CLRED ROUTING AND READ THE PLTDEV CARD WITH THE PHONE NUMBER TO CALL. TO THE BEST OF MY KNOWLEDGE DTW APCH ISSUED THE CORRECT RTE. THE PLT THOUGHT HE WAS FLYING THE CORRECT RTE BUT THE AUTOPLT TURNED DIRECT AIR AFTER MAARS INSTEAD OF FLYING THE WHOLE MAARS DEP OVER ACO. THIS HAS HAPPENED NUMEROUS TIMES IN THE PAST NOT JUST TO ME BUT TO OTHER CTLRS. I WAS TOLD BY AN OPS MGR THAT THE PROB IS WITH A FOREIGN MADE FMS SOFTWARE. IN THE PAST THE CTLRS HAVE CAUGHT AND CORRECTED THE DEV BEFORE AN ACCIDENT. IF THIS IS NOT CORRECTED I FEAR A MIDAIR COLLISION COULD HAPPEN. A SOLUTION COULD BE NOT TO LET AIRPLANES WITH THIS FMS FLY THE MAARS DEP UNTIL THIS IS FIXED!

Data retrieved from NASA's ASRS site as of May 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.