Friday, June 5, 2020

Bombardier Temperature Correction Bug

Gareth Corfield (via Hacker News):

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.


Both companies disagreed with the FAA’s directive when it was in draft format, arguing that a software fix would be easier to accomplish than banning the use of the automatic calculator.


Bugs in flight control software are rare, though not unknown. Most bugs in airliners tend to be unforeseen memory overflows, as both Airbus and Boeing have discovered over the years. A design formerly owned by Bombardier, the Airbus A220 (nee Bombardier C-series) suffered from software-induced problems with its engines last year, while the Boeing 737 was discovered to have a rare bug that completely blanked all cockpit displays if pilots tried to land on one of seven specific runways in the world.

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