> For instance, let's say that a law specifies that vehicles used by some governmental department must be maintained according to the specifications in their re

> For instance, let's say that a law specifies that vehicles used by some governmental department must be maintained according to the specifications in their respective owners' manuals. I think this is how it works with aircraft. The manufacturer issues at POH (Pilot Operating Handbook), and the pilot must operate the aircraft in accordance with this POH. Also the pilot is required to have the POH available in the aircraft anytime it is being flown. More info on the POH/AFM: https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/11_phak_ch9.pdf https://www.faa.gov/regulations_policies/handbooks_manuals/a...