Umm, optional, but not really?
I assume you can choose not to adopt, but the alternative is significantly more disruptive & ultimately more expensive.
https://www.faa.gov/sites/faa.gov/files/2023-08/ServiceBulletins_AircraftOwner.pdf
If Service Bulletins are not Mandatory, Can I Ignore Them?
No. Manufacturers issue SBs to call attention to improvements you should make to enhance your safety. It is also just good sense to heed the advice of the aircraft manufacturer who is providing important information about your aircraft.
Wonder why the draft only went to the big 4 US carriers?
Cheers
DrDazmo
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