14 C.F.R. § 63.51 Eligibility requirements; general.
Title 14 - Aeronautics and Space
To be eligible for a flight navigator certificate, a person must— (a) Be at least 21 years of age; (b) Be able to read, write, speak, and understand the English language; (c) Hold at least a second-class medical certificate issued under part 67 of this chapter within the 12 months before the date he applies; and (d) Comply with §§63.53, 63.55, and 63.57.
Title 14: Aeronautics and Space
PART 63—CERTIFICATION: FLIGHT CREWMEMBERS OTHER THAN PILOTS
Subpart C—Flight Navigators
§ 63.51 Eligibility requirements; general.