There is no such thing as an "Advisory AD".
AD's are, by definition, mandatory - failure to comply with an AD means the aircraft is no longer considered airworthy. An operator can petition to have the compliance time period extended (occasional granted if there are extenuating circumstances), but the AD must be complied with for the aircraft to be operated legally.
Under rather specific circumstances, an operator can petition for an alternate means of compliance (AMOC) to the AD - AMOCs are granted (or denied) on a case by case basis - however if an AMOC is granted it means that the AD is complied with via the AMOC rather than the specifics of the AD.