14 CFR §194.209

1. (a)A person who obtains at least a private pilot certificate with a powered-lift category rating by satisfactorily completing the practical test in a powered-lift that is precluded from performing each task required by § 61.43(a)(1) of this chapter may not serve as second-in-command of a powered-lift that is capable of performing the tasks that were waived on the person's practical test until the person has—
   1. (1)Received and logged ground and flight training from an authorized instructor on the specific tasks that were waived on the person's practical test; and
   2. (2)Received a logbook or training record endorsement from an authorized instructor certifying the person has satisfactorily demonstrated proficiency of those tasks.
2. (b)The training and endorsement required by paragraph (a) of this section are not required if, prior to serving as second-in-command, a person meets one of the following requirements—
   1. (1)Successfully completes the practical test for a powered-lift type rating, and the practical test includes each task required by § 61.43(a)(1) of this chapter; or
   2. (2)Has received ground and flight training under an approved training program and has satisfactorily completed a competency check under § 135.293 or § 91.1065 of this chapter in a powered-lift, and the approved training and checking include each task that was previously waived in accordance with § 194.207(b).
3. (c)An applicant receiving flight training under § 194.221, § 194.223, § 194.229, or § 194.231 may serve as second-in-command in a powered-lift type certificated for more than one required pilot flight crewmember without meeting the requirements of § 61.55(a)(1), (a)(2), and (b)(2) of this chapter.