I thought i'd open this, so we can post links to actual manuals.
Cessna 172 SP http://www.gaceflyingclub.com/…20Manual%20Searchable.pdf
Aermacchi MB339 http://www.avialogs.com/index.…acchi/mb339/2249todo.html
A320 training manual http://www.737ng.co.uk/A320%20…w%20Training%20Manual.pdf
A320 systems: http://www.avialogs.com/en/air…-pilot-s-guide-vol-4.html
NB: Please not that nor Ipacs or I own any of these manuals. Check copyrights where necessary if you are going to use them. Also please note that these are for reference only. They might no longer be applicable in real aircraft. The accuracy is not verified.