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b)  Working groups (WGs). One or more WGs, consisting of specialists from participating operators, design organizations and regulatory authorities, may also be formed to develop initial minimum maintenance requirements for new or derivative aeroplanes. The ISC ensures that applicable supporting technical data and analysis are provided to the WG.
c)  Maintenance review board (MRB). The State of Design should approve certain minimum maintenance requirements that an operator needs to accomplish when the aeroplane is initially placed in service. The authority normally approves initial minimum maintenance requirements that are proposed by selected specialists in airworthiness requirements, continuing airworthiness and aeroplane design. The State of Design may also invite participation from authorities of the States of the intended operators. A group of these specialists is referred to as the MRB. The MRB also ensures that the design organization and manufacturer provide the necessary technical training to MRB, ISC and WG members. The MRB reviews reports, provides notification of potential problem areas and offers guidance and assistance to the ISC and WG. Upon successful review, the regulatory authority approves the MRB report or revision.

1.7.5 Maintenance review board process
1.7.5.1  The MRB supports, by active participation, the development of a proposal or a report containing the initial minimum maintenance requirements to be used in the development of an approved maintenance programme for a derivative or newly certificated transport aeroplane.
1.7.5.2  The design organization normally provides a recommended maintenance programme for the aeroplane model. In order to assure that this recommended maintenance programme is compatible with the intended operation of the aeroplane, the design organization will assemble an ISC, the goal of which is to review the recommended maintenance programme and revise it as needed so that it meets the requirements of the intended operators. The authorities of the State of Design and the States of the intended operators normally participate in the ISC and its individual WGs in an advisory capacity regarding continuing airworthiness requirements.
1.7.5.3  The ISC directs the WGs and coordinates activities with the MRB. The MRB acts on MRB report proposals or revisions, and briefs other concerned regulatory authorities regarding MRB policies and procedures.

1.7.6  Maintenance review board report
1.7.6.1 The MRB report outlines the initial minimum maintenance requirements to be used in the development of an approved maintenance programme for the aeroplane and its major components (airframe, engine, systems and other components). Although the MRB report is approved by the State of Design, there may be a need to identify national regulation differences that are not compatible, acceptable or applicable to all regulatory authorities. When this condition exists, an appendix to the MRB report is normally used to list these differences, each being accepted by the respective regulatory authority. The requirements of the MRB are the basis from which operators develop their initial maintenance programme.
1.7.6.2 When the MRB has resolved all issues, including those raised by other authorities, the report is forwarded to the MRB Chairman for final approval. Once the report is approved by the State of Design, the design organization will normally publish and distribute the report, together with any supporting documents, to all holders of the maintenance programme, including the authorities in the States of Registry and the States of the Operators.
1.7.6.3  The regulatory authorities in the State of Registry and the State of the Operator review the MRB report and, once it is found acceptable, authorize the operator to incorporate all applicable maintenance requirements in the report into his initial maintenance programme.
1.7.6.4 The MRB and ISC normally conduct a joint annual review of each MRB report to determine the need for revision. Where the need exists, the ISC and MRB convene and evaluate the proposed changes. Proposed revisions are processed and approved in the same manner as the MRB report.
　
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