Software Bug In Bombardier Airliner Made Planes Turn The Wrong Way
Missed approaches went left instead of right - and vice versa
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May 29, 2020 - by Gareth Corfield for theregister.co.uk
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.
First discovered in 2017, the flaw was only apparent when pilots manually edited a pre-set "climb to" altitude programmed into a "missed approach" procedure following an Instrument Landing System approach.
It also arose if pilots used the FMS's temperature compensation function in extremely cold weather.
In theory the bug could have led to airliners crashing into the ground,...
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