14 CFR § 117.17 - Flight duty period: Augmented flightcrew.
(a) For flight operations conducted with an acclimated augmented flightcrew, no certificate holder may assign and no flightcrew member may accept an assignment if the scheduled flight duty period will exceed the limits specified in Table C of this part.
(b) If the flightcrew member is not acclimated:
(1) The maximum flight duty period in Table C of this part is reduced by 30 minutes.
(2) Ninety consecutive minutes are available for in-flight rest for the pilot performing monitoring duties during landing.