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a)  the organization has its approval extended to include the subcontracted work; it assesses the competence of the subcontractor;
b)  the approved organization retains responsibility for quality control and release of subcontracted activities, according to the appropriate airworthiness requirements; and
c)  necessary procedures should be in place for the control of subcontracted activities, together with terms of reference for the personnel responsible for their management.
4.2.11 Component and material supplier’s evaluation and subcontractor control procedure by the  approved maintenance organization
This paragraph mainly regards the component and material supplier’s evaluation carried out by the approved maintenance organization and the control exercised by this approved maintenance organization on the its approved or non approved contractors. The ultimate goal of the approved maintenance organization is to make sure that:
a)  the received component/material from its supplier is airworthy and/or
b)  the contracted maintenance work has been performed according to its own standards.
This component may come from a supplier (with out any maintenance work contracted) or from a contractor (approved or not) in this latter case generally a maintenance task has been ordered.
 4.2.11.1 Assessment of the Suppliers (no maintenance services are provided).. The approved maintenance organization should assess its suppliers (questionnaire, audit etc.), implement procedures in order to retain/withdraw the authorization to use such suppliers, and establish special instructions concerning the expected component/part release document (airworthiness tag, conformity statement). These documents may depend on the supplier origin (manufacturer, retailer, airline, distributors, maintenance workshop etc.).
4.2.11.2 Assessment of the Approved Subcontractors (maintenance services are provided by these approved maintenance organizations also called approved workshops). Before using those approved contractors, the maintenance organization should describe how the following items are satisfactorily dealt with (not an exhaustive list of items):
a)  the approved workshops reference list (only those included in this list can be contracted to work)
b)  the control of the scope of activity of the approved workshops towards the maintenance services sought by the approved maintenance organization
c)  the means internally implemented so that only those approved workshops could be used as workshops (checking the list of the approved workshops chosen from lists issued by the CAA)
 4.2.11.3 Assessment of the Unapproved Subcontractors (maintenance services are provided by these unapproved maintenance organizations). The quality assurance system of the approved maintenance organization should include all the subcontracted activities. All human resources, the means and the procedures used by the subcontractor should have been treated (and controlled) in the same way as the ones coming from the approved maintenance organization (those human resources, means and procedures are supposed to have already been accepted by the Authority in the framework of its approval). Special attention should be paid to the release to service procedure. The maintenance release is finally signed under the approval of the approved maintenance organization. The internal control activity of the subcontracting activities should be audited by the approved maintenance organization.
4.2.12 Inspection and acceptance of aircraft components and material from outside contractors
This paragraph mainly concerns the compliance of materials in general (equipment, components,
standard parts, materials) received from suppliers/subcontractors (external sources). This paragraph refers
to the acceptance of materials stated as compliant ones. 
4.2.12.1 The approved maintenance organization may obtain component/material from various sources:
　
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