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4.3.3.3  Service experience is a vital ingredient requiring the cooperation of all operators. Each operator should revise the maintenance programme to include, as appropriate, the data contained in the continuing structural integrity programme and should also provide an adequate system for recording and reporting in a timely way to the type design organization the operational usage, the structural discrepancies experienced in service and, where available, the results of initial analysis. These data should include a description and the location of the damage, identification of the aeroplane, relevant data on its modification status and operating history, time since beginning operations, time since the last maintenance check, the means by which the discrepancy was detected and its probable cause. It should be recognized that each operator has to make an individual determination as to how the data that are in the continuing structural integrity programme should be incorporated in the maintenance programme owing to the differences in the various operators’ maintenance programmes, operating environment and fleet modification status.
4.3.3.4 Where an operator wishes to introduce into service an aeroplane of a type for which a structural integrity assessment has been made, the operator should determine that the continuing structural integrity programme acceptable for the particular aeroplane type is available and that a statement of special additions necessary to cover any particular features of significant structural repairs or modifications is also available. The operator should also have access to sufficient past maintenance records of the aeroplane to determine the time at which the structural inspection/modification would be required.
4.3.4 Continuing assessment of structural integrity
4.3.4.1  General
4.3.4.1.1 The first essential is to identify the structural parts and components which contribute significantly to carrying flight, ground, pressure or control loads and whose failure could affect the structural integrity necessary for the safety of the aeroplane and whose damage tolerance or safe-life characteristics it is therefore necessary to establish or confirm.
4.3.4.1.2 Analyses made in respect of the continuing assessment of structural integrity should be based on supporting evidence which includes test and service data. This supporting evidence should include a representative operating loading spectra, structural loading distributions and material behaviour. In establishing inspection threshold, inspection frequency and, where appropriate, retirement life, an appropriate allowance should be made for crack initiation through the life of the structure and the rate of crack propagation. Alternatively, an inspection threshold may be based solely on a statistical assessment of fleet experience, provided that it can be shown that equal confidence can be placed in such an approach.
Note 1.— Operating loading spectra may be confirmed by an in-flight loads monitoring programme.
Note 2.— In the case of corrosion, no analytical techniques are available and the establishment of thresholds and repeat intervals will need to be based on the analysis of world-wide service experience.
4.3.4.1.3  Some organizations responsible for the type design find that an effective method of evaluating the structural condition of older aeroplanes is a selective inspection with intensive use of non-destructive techniques and an inspection of individual aeroplanes involving partial or complete dismantling (tear-down) of available structures.
4.3.4.1.4 The effect of repairs and modifications approved by the type design organization should also be taken into account. In addition, it may be necessary to consider the effect of repairs and operator-approved modifications on individual aeroplanes. The operator is responsible for ensuring notification and consideration of any such aspects.
Note.— The assessment of continuing airworthiness of repairs and modifications is a complex task involving both operators and organizations responsible for the type design.
　
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