John Deakin has a bit to say here
http://www.avweb.com/news/pelican/186216-1.html on POH’s, the 550 and 520. In summary he says
I don't recommend you throw away your POH. There is a lot of good info in it, and it's usually just about all you've got. But don't take it as holy writ, and read it with a jaundiced eye, remaining alert for errors, typos, and poor logic. Read it for entertainment value, for there is often some really funny stuff.
Then you have this. Guess there might be some funny stuff in the CAR's as well.
CAR 138 Pilot to comply with requirements, etc of aircraft’s flight manual, etc
(1) If a flight manual has been issued for an Australian aircraft, the pilot in command of the aircraft must comply with a requirement, instruction, procedure or limitation concerning the operation of the aircraft that is set out in the manual.
Penalty: 50 penalty units.