That is simply saying in designing the actual final rule, the FAA thought providing a 30 minute buffer for each FDP was appropriate and reasonable. They are supporting their decision process as opposed to what was published in the NPRM.
However, the actual mechanism of extending the FDP for ANY length of time, up to and including 2 hours, requires both the PIC and the company's approval.
Section 117.19 delineates the exact mechanism of this extension:
? 117.19 Flight duty period extensions.
(a) For augmented and unaugmented operations, if unforeseen operational
circumstances arise prior to takeoff:
(1) The pilot in command and the certificate holder may extend the
maximum flight duty period permitted in Tables B or C of this part up to 2 hours.
Note that it does NOT say in 117.19.a.1 is that the
certificate holder may extend the maximum flight duty period permitted in Tables B or C of this part up to 30 minutes.
Nor does the 117 interpretation published by the FAA in the Federal Register support your viewpoint.
Everything that I have heard is that the PIC needs to approve any extension of any length (and may, later, rescind such extension should events warrant). Certainly if there was verbage to support otherwise, managements would be all over it.
Nu