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Re:Embraer Phenom 300 yaw damper fail due to loss of GPS sig... by rsync on Saturday September 17, 2016 @04:51AM (#12519733)
Translation: we never tested flight with the GPS off.
Re:Embraer Phenom 300 yaw damper fail due to loss of GPS sig... by raverbashing on Saturday September 17, 2016 @05:46AM (#12519868)
Planes are not built by "stuff.js" hackers I'm afraid

And it does work without GPS, as this link (which was posted in this page http://forums.jetcareers.com/threads/emb-300-phenom-yaw-damp... ) shows