Gentlemen,this is becoming an overcomplicated issue.Firstly no SB is mandatory it does not matter what it says the manufacturer will call it what it wants but is not required to be done,if it becomes mandatory it will be Supported by an AD which will reference the SB,therefore the AMM will always be the primary approved document,and written on the SB it will tell you that if there is a conflict of instructions the AMM takes precedence.Being that the SB is not mandatory the issue date of the SB to AMM is irrelevent as if the SB does become mandatory then the AD will say that the AD takes precedence over the AMM and an ammendement to the AMM will be issued.Please further note that the I.P.C.& the vendor manual are unapproved documents but the MPD&AMM are approved documents therefore these 2 are always the documents that are relevent.Please note that the vendor manual should not be confused with the component maintenance manual(CMM)which is also an approved document.
matkat