1.7 Maintenance review board (MRB)
1.7.1  Introduction
1.7.1.1  This section is intended to provide an introduction to the maintenance review board (MRB) process used during the development of an initial scheduled maintenance programme, usually done for derivative or newly certificated large aeroplanes as appropriate. It is not intended to provide comprehensive guidance to States and operators. 
1.7.1.2  Annex 8 requires that a maintenance programme, which includes the maintenance tasks and recommended intervals at which these tasks are to be performed, be issued. The development of an initial maintenance programme at the time of aircraft type certification is sometimes referred to as the MRB process.
1.7.1.3 Annex 6, Part I, 8.3/Part III, Section II, 6.3 requires an operator to provide an aeroplane/helicopter maintenance programme, approved by the State of Registry, that contains maintenance tasks, intervals, and how the tasks are to be performed. When an MRB document has been issued, the operator should take into account its content when developing its own maintenance programme.

1.7.2 General
The primary purpose of the MRB process is to assist the design organization and the operator in establishing an initial approved maintenance programme for aeroplanes and the regulatory authority in approving that programme. The MRB report becomes the basis for the first issue of an operator’s initial maintenance programme. Adjustments may be necessary to address operational or environmental conditions unique to that operator. Through operator experience, and with regulatory approval, additional changes to the maintenance programme may be made by the operator in order to maintain a safe and efficient maintenance programme.

1.7.3 Background
1.7.3.1  The process of developing maintenance programmes for new aeroplanes has evolved from operator-proposed programmes to one in which the regulatory authority and aviation industry work together to develop initial minimum maintenance requirements for new aeroplanes. Subsequent development of initial scheduled maintenance requirements revealed that a programme of effective maintenance tasks could be developed through the use of logical analysis of possible aircraft system failures and their consequences.
1.7.3.2 The decision logic and analysis procedures were contained in a document entitled “Airline/Manufacturer Maintenance Program Plan Document” (MSG-1). These procedures were used by the aviation industry and the State of Design’s regulatory authority to develop initial minimum maintenance recommendations for the B-747 aeroplanes. Through experience gained from this logic, procedures were updated to produce a universal document which could be applied to future newly certificated aeroplanes. This effort resulted in the MSG-2 document.
1.7.3.3  The MSG-2 logic was used to develop initial minimum maintenance procedures during the 1970s. In 1980, with the combined efforts of aeroplane and engine manufacturers, airlines, aviation interest groups and regulatory authorities worldwide, new decision logic and analysis procedures were generated in a document called MSG-3. Then, in light of the experience gained in using MSG-3 analysis on a number of aeroplanes, industry issued several revisions to MSG-3. Since the 1980s, MSG-3 and its successive revisions have been commonly used in developing aeroplanes’ initial maintenance programmes.

1.7.4  Organization
The MRB process involves the following organizational bodies:
a)  Industry steering committee (ISC). Management of maintenance programme development activities is normally accomplished by an ISC composed of operators and design organizations. The ISC establishes policies, sets goals for maintenance check intervals, directs activities of working groups, prepares final maintenance programme recommendations and represents operators in contacts with regulatory authorities.
　
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