(h)
Whenever circumstances reveal the existence of a potential safety threat, the com-petent authority shall carry out the airworthiness review and issue the airworthiness review certificate itself;

(i)  
In addition to paragraph (h), the competent authority may also carry out the airwor-thiness review and issue the airworthiness review certificate itself in the following cases:

1.  
when the aircraft is managed by a continuing airworthiness management organi-sation approved in accordance with Section A, Subpart G of this Annex (Part M) located in a third country;

2.  
for all balloons and any other aircraft of 2730 kg MTOM and below, if it is requested by the owner;

(j)  
When the competent authority carries out the airworthiness review and/or issues the airworthiness review certificate itself, the owner or operator shall provide the competent authority with:

1.  
the documentation required by the competent authority; and

2.  
suitable accommodation at the appropriate location for its personnel; and

3.  
when necessary, the support of personnel appropriately qualified in accordance with Annex III (Part-66) or equivalent personnel requirements laid down in point 145.A.30(j)(1) and (2) of Annex II (Part 145);

(k)
An airworthiness review certificate cannot be issued nor extended if there is evidence or reason to believe that the aircraft is not airworthy.

AMC M.A.901 Aircraft airworthiness review

In order to ensure the validity of the aircraft airworthiness certificate, M.A.901 requires performing periodically an airworthiness review of the aircraft and its continuing airwor-thiness records, which results in the issuance of an airworthiness review certificate valid for one year.
Any airworthiness review certificate or equivalent document issued in accordance with the Member State requirements and valid on the date of entry into force of Part-M, Subpart I, is considered to attest the validity of the aircraft airworthiness certificate until its expiration or until one year after the entry into force of Part-M, Subpart I, whichever comes first. As a consequence, it is not necessarily required for the competent authority to re-issue all national airworthiness review certificates on the date of entry into force of Part-M, Subpart-I, being possible to wait until the limit mentioned above. However, when transferring the registration of the aircraft within the EU, this national airworthiness review certificate may not be recognised by the importing authority, and a new airwor-thiness review certificate may need to be issued in accordance with M.A.904.
AMC M.A.901 (a) Aircraft airworthiness review
EASA Form 15a is issued by competent authorities while EASA Form 15b is issued by a
M.A. Subpart G organisation.
AMC M.A.901 (b) Aircraft airworthiness review
1.  
If the continuing airworthiness of the aircraft is not managed according to a Part-M appendix I arrangement between the owner and the M.A. Subpart G organisation, the aircraft should be considered to be outside a controlled environment. Nevertheless, such arrangement is not necessary when the operator and the M.A. Subpart G organi-sation are the same organisation.

2.  
The fact that limited pilot-owner maintenance as defined in M.A.803 (b) is not car-ried out and released by an approved maintenance organisation does not change the status of an aircraft in a controlled environment providing the M.A. Subpart G organisation under contract has been informed of any such maintenance carried out.

AMC M.A.901 (c)(2), (e)(2) and (f) Aircraft airworthiness review
When the aircraft has remained within a controlled environment, the extension of the validity of the airworthiness review certificate does not require an airworthiness review but only a verification of the continuous compliance with M.A.901 (b).
　
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