(a) Each certificate holder or operator shall test each of its employees who performs a function listed in appendix I to this part in accordance with that appendix.

(b) No certificate holder or operator may use any contractor to perform a function listed in appendix I to this part unless that contractor tests each employee performing such a function for the certificate holder or operator in accordance with that appendix.

[Doc. No. 25148, 53 FR 47057, Nov. 21, 1988, as amended by Amdt. 121-251, 60 FR 65934, Dec. 20, 1995]