PART 4

Airworthiness of Aircraft
CHAPTER 2

Initial airworthiness – non-EASA aircraft

National certificate of airworthiness ceasing to be in force and issue of airworthiness directives for non-EASA aircraft
39
1
Subject to paragraph (3), a national certificate of airworthiness issued for a non-EASA aircraft registered in the United Kingdom ceases to be in force if—
a
the aircraft or any part of the aircraft or such of its equipment as is necessary for the airworthiness of the aircraft has been overhauled, repaired, replaced, modified or maintained;
b
maintenance or an inspection of the aircraft or of any equipment necessary for the airworthiness of the aircraft is required by a maintenance programme established under article 54;
c
maintenance of the aircraft or of any equipment necessary for the airworthiness of the aircraft has been made mandatory by a directive issued by the CAA;
d
an inspection for the purpose of ascertaining whether the aircraft remains airworthy has been made mandatory by a directive issued by the CAA; or
e
any modification of the aircraft or of any equipment which is necessary for the airworthiness of the aircraft, has been made mandatory by a directive issued by the CAA for the purpose of ensuring that the aircraft remains airworthy.
2
A certificate of airworthiness which has ceased to be in force under paragraph (1) becomes valid again on the issue of a certificate of release to service under this Order or in accordance with paragraph 21A.163(d) of Part 21 relating to the overhaul, repair, replacement, modification, maintenance or inspection.
3
A certificate of airworthiness which would not be in force by reason of paragraph (1) remains in force if the aircraft is flying in the circumstances specified in article 44(3).