14 CFR § 91.1061

No program manager may assign any flight crewmember, and no flight crewmember may accept an assignment, for flight time as a member of an augmented crew if that crewmember's total flight time in all commercial flying will exceed—

500 hours in any calendar quarter;

800 hours in any two consecutive calendar quarters;

1,400 hours in any calendar year.

No program manager may assign any pilot to an augmented crew, unless the program manager ensures:

Adequate sleeping facilities are installed on the aircraft for the pilots.

No more than 8 hours of flight deck duty is accrued in any 24 consecutive hours.

For a three-pilot crew, the crew must consist of at least the following:

A pilot in command (PIC) who meets the applicable flight crewmember requirements of this subpart and § 61.57 of this chapter.

A PIC qualified pilot who meets the applicable flight crewmember requirements of this subpart and § 61.57(c) and (d) of this chapter.

A second in command (SIC) who meets the SIC qualifications of this subpart. For flight under IFR, that person must also meet the recent instrument experience requirements of part 61 of this chapter.

For a four-pilot crew, at least three pilots who meet the conditions of paragraph (b)(3) of this section, plus a fourth pilot who meets the SIC qualifications of this subpart. For flight under IFR, that person must also meet the recent instrument experience requirements of part 61 of this chapter.

No program manager may assign any flight crewmember, and no flight crewmember may accept an assignment, if that crewmember's flight time or duty period will exceed, or rest time will be less than—