M.A.502 Component maintenance
(a)
The maintenance of components shall be performed by maintenance organisations appropriately approved in accordance with Section A, Subpart F of this Annex (Part M) or with Annex II (Part-145).

(b)
By derogation from paragraph (a), maintenance of a component in accordance with aircraft maintenance data or, if agreed by the competent authority, in accordance with component maintenance data, may be performed by an A rated organisation approved in accordance with Section A, Subpart F of this Annex (Part M) or with Annex II (Part-145) as well as by certifying staff referred to in point M.A.801(b)2 only whilst such components are fitted to the aircraft. Nevertheless, such organisation or certifying staff may temporarily remove this component for maintenance, in order to improve access to the component, except when such removal generates the need for additional maintenance not eligible for the provisions of this paragraph. Component maintenance performed in accordance with this paragraph is not eligible for the issuance of an EASA Form 1 and shall be subject to the aircraft release requirements provided for in point M.A.801.

(c)
By derogation from paragraph (a), maintenance of an engine/Auxiliary Power Unit (APU) component in accordance with engine/APU maintenance data or, if agreed by the competent authority, in accordance with component maintenance data, may be performed by a B rated organisation approved in accordance with Section A, Subpart F of this Annex (Part M) or with Annex II (Part-145) only whilst such components are fitted to the engine/APU. Nevertheless, such B rated organisation may temporarily remove this component for maintenance, in order to improve access to the compo-nent, except when such removal generates the need for additional maintenance not eligible for the provisions of this paragraph.

(d)
By derogation from paragraph (a) and point M.A.801(b)2, maintenance of a compo-nent while installed or temporarily removed from an ELA1 aircraft not used in com-mercial air transport and performed in accordance with component maintenance data, may be performed by certifying staff referred to in point M.A.801(b)2, except for:

1.
overhaul of components other than engines and propellers, and;

2.
overhaul of engines and propellers for aircraft other than CS-VLA, CS-22 and LSA.

Component maintenance performed in accordance with paragraph (d) is not eligible for the issuance of an EASA Form 1 and shall be subject to the aircraft release require-ments provided for in point M.A.801.
AMC M.A.502 Component maintenance
Component removal from and installation on an aircraft is considered to be aircraft main-tenance and not component maintenance. As a consequence, M.A.502 requirements do not apply to this case.
AMC M.A.502 (b) and (c) Component maintenance
M.A.502(b) and (c) allow the performance of certain component maintenance, in accord-ance with component maintenance data, to maintenance organisations not holding the corresponding B/C rating and to independent certifying staff, subject to the agreement of:
- The authority responsible for the oversight of the maintenance organisation (refer to M.1, paragraph 2 for M.A. Subpart F maintenance organisations, or to 145.1 for Part-145 maintenance organisations), or, 
- The authority of the Member State of registry in the case of maintenance performed by independent certifying staff. 

This should only be permitted by the competent authority in the case of simple compo-nent maintenance, where the competent authority is satisfied that the certifying staff are appropriately qualified and the proper tooling and facilities are available. It is important to note that for more complex component maintenance, special qualifications may be required and it is not enough with holding a Part-66 aircraft maintenance licence.
ED 2008/013/R
Section A
PART-M
　
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