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(Refer to Part III, Chapter 4, Section 4.4.5 for more detail regarding Airworthiness Directives.)
4.4.2.1.2  The type, model and serial number of the aircraft, engine, propeller, equipment or instrument affected shall be included in the contents of the mandatory continuing airworthiness information. The mandatory information may require additional or more frequent inspections or maintenance or modifications, and usually with a time limit for compliance in terms of a date, flying hours or number of landings.
4.4.2.1.3  The State of Design, in determining the time limit for compliance should, without prejudice to safety considerations, take into account the availability of modification kits, tools, material, etc. It should also take into account the service experience in other States and should not limit its evaluation to the service experience in its own State. Time limits for conducting initial inspections, as well as conducting recurrent inspections, are frequently tailored to the inspection methods being used.
4.4.2.1.4  States with maintenance organizations approved for aircraft types not registered or not operated in that State, or approved for parts or equipment not used in that State, should request the State of Design to provide all mandatory airworthiness information on those types and parts.
4.4.2.1.5  When the State of Design of the engine or propeller is different to the State of Design of the aircraft, the State of Design for the aircraft should review mandatory airworthiness information from the State of Design for the engine or propeller and either promulgate that information as being applicable to the aircraft type in question, or supplement it to take account of the specific installation in the aircraft. The aircraft type design organization should assist in this review. (Reference Annex 8 Part II 4.2.1.2)
4.4.2.1.6 In accordance with Annex 8, Part II, Chapter 4, 4.3.1.2, when the State of Design of a modification is different from the State of Design of the product being modified, the State of Design of the modification must transmit the mandatory continuing airworthiness information to the State of Design of the product and to States that have the modified product on their Registries. A State may fulfil this obligation by transmitting mandatory continuing airworthiness information to:
a)  Contracting States that are known (by the State of Design of the modification) to have the modification embodied on aircraft on their register; or
b)  Contracting States that have notified under 4.2.3(a) with respect to aircraft types for which the modification is eligible; or
c)  All Contracting States.
4.4.2.1.7 The intent of Annex 8 requirement is to ensure that States of Registry receive any relevant continuing information that impact aircraft on their registries. However, State of Design for a modification may not have information available as to the location of the modified aircraft. Therefore, several options for transmission of information are available to the State of Design for a modification. The smallest group of States that covers the known population of aircraft should be targeted in order to reduce the administrative burden as far as practicable.
4.4.2.2 Action by State of Registry upon receipt of mandatory airworthiness information
4.4.2.2.1  Annex 8, Part II, 42.3 d) states:
“The State of Registry shall, upon receipt of mandatory continuing airworthiness information from the State of Design, adopt the mandatory information directly or assess the information received and take appropriate action.”
Legally, the mandatory status of mandatory airworthiness information is limited to the State that has issued that information. It is essential, however, that appropriate action be taken on all affected aircraft and parts in all States concerned. States should therefore carefully consider mandatory airworthiness information issued by the State of Design, as the State of Design and the type design organization are primarily responsible for issuing this airworthiness information and they normally are the best informed about accidents, incidents and service experience concerning the type design.
　
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