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States should only make mandatory requirements additional to those of the State of Design when there are urgent safety-related reasons. When possible, such action should entail prior consultation with the State of Design, but in all cases the State of Design should be notified as soon as practicable or when the State of Registry has uniquely designed or modified aircraft because of unique airworthiness requirements.
4.4.2.4 Airworthiness actions by State of  Design and design organization
4.4.2.4.1  Annex 8, Part II, 4.2.1.1 b) states:
“The State of Design of an aircraft shall ensure that, in respect of aeroplanes over 5 700 kg and helicopters over 3 175 kg maximum certificated take-off mass, there exists a system for:
i) receiving information submitted in accordance with 4.2.3 f);
ii) deciding if and when airworthiness action is needed;
iii) developing the necessary airworthiness actions; and
iv) promulgating the information on those actions including that required in 4.2.1.1 a).”
The State of Design and the type design organization should assess all airworthiness information received, including the information mentioned under Annex 8, Part II, 4.2.3 e) and 4.2.3 f) and information on accident investigations (see paragraph 4.4.3.1 below concerning guidance on 4.2.3 f) of Annex 8, Part II).
4.4.2.4.2  The type design organization should respond to the reporting operator and should include in the response advice on the actions needed for the reported service difficulty to ensure continuing airworthiness. The type design organization should also inform other affected operators. 
4.4.2.4.3 Whenever there is evidence that its product is unsafe because of a manufacturing or design defect, the type design organization should investigate the reason for the defect and report to the State of Design the results of its investigation and any action being taken or proposed to correct the defect. If action is required to correct the defect, the type design organization should submit the data necessary for the issuance of appropriate mandatory airworthiness information.
4.4.2.4.4  When the State of Design considers that the issuance of mandatory airworthiness information is necessary to correct the unsafe condition, the type design organization should propose the appropriate design changes and/or required inspections and submit details of these proposals for approval. Following the approval of the proposed design changes or inspections, it should make available to all operators appropriate descriptive data and accomplishment instructions. The organization responsible for type design should also make updates to user documents not subject to approval by the CAA, such as the aircraft service manual, illustrated parts catalogue, etc.
4.4.3. Other airworthiness information
4.4.3.1  Transmission of information on faults, malfunctions and defects and other occurrences
4.4.3.1.1  Annex 8, Part II, 4.2.3 f) states:
“The State of Registry shall ensure that in respect of aeroplanes of over 5 700 kg and helicopters above 3 175 kg maximum certificated take-off mass, there exists a system whereby information on faults, malfunctions, defects and other occurrences which cause or might cause adverse effects on the continuing airworthiness of the aircraft is transmitted to the organization responsible for the type design of that aircraft.” 
When the State of Design for the engine or propeller is different to the State of Design for the aircraft, the State of Design of the aircraft should have a system to transmit information on service difficulties to the State of Design for the engine or propeller. The State of Registry may also elect to transmit the information to the State of Design for the engine or propeller. 
4.4.3.1.2 It is essential that information on airworthiness deficiencies is transmitted without any delay to the type design organization of the aircraft affected, so that corrective action may be developed by that organization and communicated to all operators of the aircraft type.
　
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