PART 4Airworthiness of Aircraft
CHAPTER 3Continuing airworthiness for Non-Part-21 aircraft
Requirement for and validity of a national airworthiness review certificate49.
(1)
An aircraft with a national certificate of airworthiness must not fly unless it has a valid national airworthiness review certificate.
(2)
Subject to articles F1... 50, 56, 57, 58 and 253, a national airworthiness review certificate is valid for one year.