Interesting insight into what bugs in jetliner autopilots look like

From a FAA alert about a bug in the Rockwell Collins autopilot that is used in many jetliners. Interesting, it's easier for them to fix the airport database that these autopilots use than the autopilot code itself, although that will be coming later. 

"If the crew manually edits or temperature compensates a “Climb to” altitude, the FMS will remove the database turn direction (if any) on the immediately following leg. The FMS will turn in the wrong direction after sequencing the “Climb to” leg if the shortest turn direction is different than the required turn direction onto the next leg."


"Rockwell Collins has removed from both the Jeppesen and Lufthansa (LSY) Navigation Databases the approaches for which the FMS may not turn correctly after an altitude is edited beginning cycle 1712. This resulted in the removal of approximately 10,000 approaches. Rockwell Collins is working on corrective actions for this issue to restore the removed procedures and has been providing regular updates through email communication."

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