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Old 23rd Feb 2017, 16:10   #3 (permalink)
safetypee
 
Join Date: Dec 2002
Location: UK
Posts: 1,544
Further to the issues in #1, the certification reference is at:-
AC 20-167A https://www.faa.gov/documentLibrary/...AC_20-167A.pdf

This supports the view that the accident aircraft did not meet this guidance; perhaps the reason for the warning, but that may not avoid instinctive use of a compelling display.
Also, that although the regulatory guidance for synthetic vision appears similar to conventional instrument hazard assessments, it may assume too much about pilot involvement. Without a comparator system or stand by 'instrument' for synthetic vision, then the crew has to detect and resole a failure condition; choosing between a 'real world' display and the EFIS attitude indicator.
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