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4.4.3.3.3 Information on operators’ reliability programmes may be found in Part IV, Section 1.7 of this Manual.
4.4.3.4 Assessment of airworthiness information and subsequent action by the operator
4.4.3.4.1 Operators responsibilities with regard to the assessment of airworthiness information are to be found in Annex 6, Part I, 8.5.2. (Reference should be made to Part IV for explanatory material in this respect.)
“The operator of an aeroplane over 5 700 kg maximum certificated take-off mass shall obtain and assess continuing airworthiness information and recommendations available from the type design organization and shall implement resulting actions considered necessary in accordance with a procedure acceptable to the State of Registry.”
Recommendations by the type design organization are normally made by service bulletins, service letters, etc.
4.4.3.4.2 Usually the airworthiness portions of the recommendations are approved by the State of Design. If so, the document will clearly identify that approval. Operators should be aware that not all recommendations made by the type design organization have airworthiness consequences, and these may not be approved by the State of Design. In addition, some recommendations made by the type design organizations, usually things for which no operational credit is being given, may not have the full approval of the State of Design. In these cases, the State of Design merely ensures that the recommended action does not interfere with the safe operation of the aeroplane, and that its installation complies with the appropriate requirements. If there is any doubt as to what is approved and to what degree, the type design organization or the State of Design should be consulted.
4.4.3.4.3 Although these recommendations are normally not made mandatory by the State of Registry, the operator should obtain and carefully assess this information. It is clear that the operator needs qualified staff to do so. In general, it is worthwhile to accomplish the recommendations of the organization responsible for type design, as they enhance the reliability and hence availability for service of the aircraft.
4.4.3.4.4 Even if a modification is optional, it still requires approval by the State of Registry.
4.4.3.4.5 Even if the performance of maintenance is either partially or wholly assigned to a maintenance organization, the operator remains responsible for the continuing airworthiness of the aircraft. This means that the operator should have the expertise and personnel to perform the assessment of all relevant information and inform the maintenance organization, especially if this organization is in a different State, of all information made mandatory by the State of Registry.
4.4.3.4.6  The maintenance organization should have at its disposal all information issued by the type design organization relevant to the contracted work.
4.4.3.5 Type of information on continuing airworthiness to be transmitted by the type design organization
4.4.3.5.1 Response to the reporting operator should include advice on the actions needed to overcome the reported service difficulty and ensure continuing airworthiness. Service difficulties that affect continuing airworthiness should be reported to the authority in the State of Design. Communication to the operator and the authority should include the following:
a) a clear discussion of the seriousness and possible causes of the difficulty;
b) permissible limits for continued operation;
c) special inspection procedures where applicable;
d) the repeat inspection interval needed if continued operation is permissible;
e) repairs or replacement required, and when  required; and
f) limitations for non-revenue ferry flight.

4.4.3.5.2  The type design organization should also inform other affected operators of reported service difficulties that affect the continued airworthiness of the aircraft type. Communications should include the following:
　
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