Validity of certificate of airworthinessU.K.
10. A certificate of airworthiness or a certificate of validation issued in respect of an aircraft registered in the United Kingdom shall cease to be in force—
(a)if the aircraft, or such of its equipment as is necessary for the airworthiness of the aircraft, is overhauled, repaired or modified, or if any part of the aircraft or of such equipment is removed or is replaced, otherwise than in a manner and with material of a type approved by EASA in the case of an EASA aircraft or the CAA in the case of a non-EASA aircraft either generally or in relation to a class of aircraft or to the particular aircraft;
(b)until the satisfactory completion of any inspection made for the purpose of ascertaining whether the aircraft remains airworthy or maintenance of the aircraft or of any equipment described in sub-paragraph (a) which inspection or maintenance has—
(i)been made mandatory by EASA or the CAA; or
(ii)become required by a maintenance schedule approved by the CAA in relation to that aircraft; or
(c)until the completion to the satisfaction of EASA or the CAA as the case may be of any modification of the aircraft or of any equipment necessary for the airworthiness of the aircraft, being a modification required by EASA or the CAA for the purpose of ensuring that the aircraft remains airworthy.