Software bug in Bombardier airliner made planes turn the wrong way


A Bombardier CRJ200 airliner. Pic: Bombardier

A very specific software bug made airliners turn the wrong way if their pilots adjusted a pre-set altitude limit.

The bug, discovered on Bombardier CRJ-200 aircraft fitted with Rockwell Collins Aerospace-made flight management systems (FMSes), led to airliners trying to follow certain missed approaches turning right instead of left – or vice versa.

Missed approaches are used when pilots aren’t confident that they’re going to land safely. They are a published path that helps the pilot safely position the aeroplane for another attempt.

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