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Old 22nd Mar 2017, 12:08
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PGA
 
Join Date: Dec 2003
Location: Europe
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You can't tell by just looking at the PFD, but it depends on the severity of the failure, in some cases you keep ALT 1 with a few more protections then when you end up in ALT2.

FCOM 27-20-20 Alternate Law explains it.
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