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Old 22nd March 2017 | 12:08
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PGA
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Joined: Dec 2003
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From: Europe
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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