14 C.F.R. § 121.548a DOD Commercial Air Carrier Evaluator's Credential.
Title 14 - Aeronautics and Space
Whenever, in performing the duties of conducting an evaluation, a DOD commercial air carrier evaluator presents S&A Form 110B, “DOD Commercial Air Carrier Evaluator's Credential,” to the pilot in command of an airplane operated by the certificate holder, the evaluator must be given free and uninterrupted access to the pilot's compartment of that airplane. [Doc. No. FAA–2003–15571, 68 FR 41217, July 10, 2003]
Title 14: Aeronautics and Space
PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS
Subpart T—Flight Operations
§ 121.548a DOD Commercial Air Carrier Evaluator's Credential.