Unlike your car, dvd player, or your standard military manual.....
Pilot Operating Notes are part of the airworthiness of the aircraft and a legal document. They carry the weight of law by convention.
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The is the master document for all flight information, and pilot's may not deviate from the POH unless specific approval has been granted by the relevant aviation authority for such deviation.
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Don't confuse the articles discussion of the GAMA changes in 1975 that put all convention signers on the same format. Manufacturers of light civil aircraft tried to save a few dollars during one of the darkest periods in General Aviation by cutting corners on the POH's. The result was the GAMA changes which standardized POH for all convention signers and everyone adopted the same format.
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The POH is approved by the aviation authority during type certification, and issued to an aircraft when it is manufactured as part of the initial airworthiness certificate.
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http://ezinearticles.com/?Pilots-Ope...101&id=6521261
It has been that way since 1919!!
As for for the "engine parts" conforming during operation, that is normal for all engines. In fact it is called the "break in"!!
No engineer looked at a part on the assembly line that would destroy the engine and said "keep churning em out boys!! We can win the war with our airplanes that won't fly".
That is really stupid. He looked at it and said, "Yes it is bent but it is still within tolerenances and won't effect anything, keep working"
Happens all the time in aviation and does not violate any convention.