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Note.— It is not uncommon to find various combinations of a), b) and c) in organizations.
4.2.2.2  Of the three methods described above, c) is considered the optimum for the present generation of large transport aircraft. Before considering this topic further, it is necessary for the purposes of this Chapter, to provide definitions of quality, quality control and quality assurance:
a)  quality of a product or service is the degree to which it meets the requirements of the customer, including the relevant airworthiness requirements;
b)  quality control is a management system for programming and coordinating the ongoing quality and improvement efforts of the various groups in an organization to permit the completion of aircraft maintenance in accordance with the requirements of the airworthiness authority and any specific requirements of the organization or customer; and
c)  quality assurance is the overall authority for the supervision of quality standards to verify that the standards are appropriately complied with and, if necessary, to initiate corrective and preventive actions for improvement of the system functioning.
4.2.2.3 In practical terms, it is very difficult to manage quality control in circumstances where completion of a task and determination of compliance with the associated quality requirements are responsibilities of separate persons (as in 4.2.2.2 b) above). The highest standard of quality of aircraft maintenance is very much dependent on the competence of the personnel who complete the tasks; it is not something that can be “inspected-in". Thus responsibility for quality control management is best vested in a competent production work force which completes the tasks and is qualified to accept responsibility for certification of them, in accordance with prescribed procedures.
4.2.2.4 No system of quality management is complete without an element of quality assurance. This provides, through an independent audit system, the necessary feedback to the management of the approved organization to ensure that:
a)  through product sampling, the requirements of the customer, including those related to airworthiness, are being satisfied;
b)  the procedures of the organization are being complied with and that they remain appropriate for the undertakings of the organization; and
c)  the organization remains in compliance with the requirements and conditions of the approval granted by the airworthiness authority.
4.2.2.5  Further guidance material on quality management is provided in Section 4.3 of this Part.
4.2.3  The purpose of the maintenance organization’s procedures manual
4.2.3.1 Annex 6, Part I, 8.7.2 places an obligation on the approved maintenance organization to provide a maintenance organization’s procedures manual.
4.2.3.2  The purpose of the procedures manual for an approved maintenance organization is threefold:
a)  to provide to the personnel the necessary information to enable them to fulfil their various roles in complying with the terms and conditions of the approval and the relevant airworthiness requirements;
b)  to provide airworthiness management for the maintenance activities undertaken by the organization; and
c)  to substantiate to the airworthiness authority how the activities included in the approval and the relevant airworthiness requirements will be satisfied.
4.2.3.3 It is recommended that the airworthiness authority consider the provision of this manual as an integral part of the approval of the organization. The manual and the subsequent amendments to the manual should therefore be acceptable to the CAA.
4.2.3.4  In the case of large organizations, it may be more appropriate for the manual to be divided into two or more volumes. The first volume would contain the essential requirements for management of the approval and compliance with the appropriate airworthiness requirements, including the control of the contents of the other volumes.
　
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