14 CFR 63.19 - Operations during physical deficiency.

§ 63.19 Operations during physical deficiency.
No person may serve as a flight engineer or flight navigator during a period of known physical deficiency, or increase in physical deficiency, that would make him unable to meet the physical requirements for his current medical certificate.

Title 14 published on 2014-01-01

no entries appear in the Federal Register after this date.