(1) If an individual is carrying out maintenance on an aircraft or aeronautical product, the individual must not fit a part that is not a standard part to the aircraft or aeronautical product unless the fitting of the part is permitted under:
(a) regulation 42.450; or
(2) For paragraph (1)(b), the part may be fitted if:
(i) the part is serviceable; or
(ii) if the part is unserviceable because of a defect in the part--the fitting of the part is permitted under subregulation (3); and
(b) the part is eligible to be fitted to the aircraft or the aeronautical product; and
(c) if the manufacturer of the part has specified a storage life for the part--the storage life for the part has not expired; and
(d) the fitting of the part is permitted under subregulation (5).
Note: For the definition of eligible to be fitted , see regulation 42.015.
(3) For subparagraph (2)(a)(ii), the part may be fitted if:
(a) the operation of the aircraft for a flight with the defect is permitted by the minimum equipment list for the aircraft; and
(b) subregulation (4) does not apply to the part.
(4) This regulation applies to a part if:
(a) before the proposed fitting of the part, the part was fitted to an aircraft; and
(b) the aircraft to which the part was most recently fitted was operated for a flight with the defect; and
(c) the operation of the aircraft for the flight with the defect was permitted by the minimum equipment list for that aircraft.
(5) For paragraph (2)(d), the part may be fitted if:
(a) for a part on which maintenance has not been carried out since its manufacture, and that has not been used in an aircraft since its manufacture:
(i) an authorised release certificate has been issued for the part in relation to its manufacture; or
(ii) the fitting of the part is permitted under regulation 42.435 or 42.440; or
(b) for a part on which maintenance has been carried out, and that has not been used in an aircraft since the maintenance was carried out:
(i) an authorised release certificate has been issued for the part in relation to the maintenance; or
(ii) if the maintenance was in - house maintenance--an in - house release document has been issued for the part in relation to the maintenance; or
(iii) the fitting of the part is permitted under regulation 42.440; or
(c) the fitting of the part is permitted under regulation
42.430.