For subparagraphs 42.420(5)(a)(ii) and (b)(iii), a part of a particular kind may be fitted to an aircraft if:
(a) the part is to be fitted by an individual carrying out maintenance on behalf of a Part 145 organisation; and
(b) the aircraft is grounded at a location that is not the organisation's main location; and
(c) the aircraft is grounded because of a defect in the aircraft that cannot be rectified without fitting a part of that kind; and
(d) a part of that kind in respect of which there is an authorised release certificate is not available at that location; and
(e) the part is accompanied by a document that:
(i) states that the part is serviceable; and
(ii) identifies the organisation that issued the document; and
(iii) includes details of the national aviation authority under whose authority the document was issued; and
(f) the person responsible for continuing airworthiness for the aircraft agrees to the fitting of the part to the aircraft; and
(g) an entry is made in the aircraft's flight technical log that, within 36 flight hours after it is fitted:
(i) the person responsible for continuing airworthiness for the aircraft must obtain an authorised release certificate for the part; or
(ii) the part must be removed.
Note: Under regulation 42.165, if an aeronautical product is fitted to an aircraft as permitted by this regulation, the person responsible for continuing airworthiness for the aircraft must, within 36 flight hours after it is fitted, obtain an authorised release certificate for the product or ensure that the product is removed from the aircraft.