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3.3.1.4 In some cases, the aircraft operator may contract the installation of a modification or repair to a separate organization. Information on retention of associated records by the installer may be found in Part IV, Chapter 1, Section 1.10.4 “Maintenance Records” of this manual, in conjunction with the relevant paragraphs of the Chapter 4 of this Part IV.
3.3.2 Responsibilities of aircraft operators
3.3.2.1  The airworthiness authority of the State of Registry should require that the aircraft operator retain records identifying any modification or repair incorporated on the aircraft, together with records of design approval and return-to-service approval. Retention of the records is required so that the modification and repair status of the aircraft may be readily established at any time. This may be necessary if an airworthiness deficiency is detected with a modification or repair requiring corrective measures or inspections and to ensure compatibility when making additional design changes to the aircraft.
3.3.2.2 The records required will vary with the complexity of the design change. In addition to the records of design approval and return-to-service approval, the following lists the kind of data that may be included, as applicable:
a)  a master drawing list and the individual drawings, photographs, specifications and records which identify the design change and locate it on the aeroplane;
b)  mass and moment change records; and
c)  a record of any change in electrical load caused by incorporation of the design change.
Part of the records should include a Supplemental Type Certificate (STC) or equivalent document, or service bulletin or structural repair manual reference, if applicable.
3.3.2.3 Annex 6, Part I, 8.4.2 and Part III, Section II,  6.4.2 require that the details of modifications and repairs to an aeroplane and its major components be retained for a minimum period of 90 days after the unit to which they refer has been permanently withdrawn from service. Annex 6, Part I, 8.4.3 and Part III, Section II, 6.4.3 require that in the event of a temporary change of operator, the records shall be made available to the new operator; and, in the event of any permanent change of operator, the records shall be transferred to the new operator.
3.3.2.4  Supplements to the approved flight manual, maintenance instructions, instructions for continuing airworthiness and repair instructions pertaining to a modification or repair are operating data that the operator should incorporate into the existing operating data for the aeroplane. Since these supplements become a permanent part of the operator’s operating instructions or instructions for continuing airworthiness, they need not be retained as part of the records required by Annex 6, Part I, 8.4.1c) and Part III, Section II, 6.4.1c). The operator should record the incorporation of the required supplements in the appropriate revision logs.
3.3.2.5  The record retention requirements for minor modifications and repairs are much simplified. It is nevertheless necessary for the aeroplane operator to retain sufficient records to:
a) identify the modification or repair and record that it has been classified as minor;
b) record its location on the aeroplane;
c) record mass and moment change, if significant; and
d) record the return-to-service approval.
Note.— For categorisation of repairs see Part III, Chapter 6.3 Repair Categories of this Manual.
CHAPTER 4.—  APPROVAL OF MAINTENANCE ORGANIZATIONS

This chapter provides descriptive guidance to airworthiness authorities on the issues to be considered in approval of organizations for the maintenance of aircraft. 
4.1 General
4.1.1 Operator
4.1.1.1  Annex 6, Part I, 8.1.1 and Part III, Section II, 6.1.1 place an obligation on the operator to ensure that the aeroplanes operated are maintained in an airworthy condition. Paragraph 8.1.2 for aeroplanes and 6.1.2  for helicopters require that an aircraft shall not be operated unless it is maintained and released by an approved maintenance organization or an equivalent system. A State, taking into account the complexity of aircraft and the degree of likely maintenance activity, may accept a system deemed to be equivalent in terms of continuing airworthiness. In this case, the certifying personnel must be licensed individually in accordance with Annex 1, Chapter 4.
　
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