(a) No certificate holder may use any person nor may any person serve as pilot in command of an airplane unless, within the preceding 12 calendar months, that person has passed a line check in which he satisfactorily performs the duties and responsibilities of a pilot in command in one of the types of airplanes he is to fly.
(b) A pilot in command line check for domestic and flag operations must—
(1) Be given by a pilot check airman who is currently qualified on both the route and the airplane; and
(2) Consist of at least one flight over a typical part of the certificate holder's route, or over a foreign or Federal airway, or over a direct route.
(c) A pilot in command line check for supplemental operations must—
(1) Be given by a pilot check airman who is currently qualified on the airplane; and
(2) Consist of at least one flight over a part of a Federal airway, foreign airway, or advisory route over which the pilot may be assigned.
[Doc. No. 9509, 35 FR 96, Jan. 3, 1970, as amended by Amdt. 121-143, 43 FR 22642, May 25, 1978; Amdt. 121-253, 61 FR 2612, Jan. 26, 1996; Amdt. 121-344, 74 FR 34235, July 15, 2009; Amdt. 121-359, 77 FR 34785, June 12, 2012]