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4.3.6  The continuing structural integrity programme
4.3.6.1  Supplemental inspections
4.3.6.1.1  A supplemental inspection programme should contain the recommendations for the inspection procedures and replacement or modification of parts or components necessary for the continued safe operation of the aeroplane. The programme should include the following information:
a)  identification of the variants of the basic aeroplane type to which the programme relates;
b)  a summary of the operational statistics of the fleet in terms of hours and flights and a description of the typical mission or missions;
c)  reference to documents giving any existing inspections, or modifications of parts or
components and to existing structural service bulletins which may still need to be applied,
in addition to those given in the programme; and
d) the types of operations for which the inspection programme is considered valid.
4.3.6.1.2  The following points should be addressed in the inspection programme: a) description of the part or component and any relevant adjacent structure (means of access to the part should also be given); b) type of damage which is being considered (e.g. fatigue, wear, corrosion, accidental
damage); c) any service experience and service bulletins which may be relevant; d) the likely site(s) of damage; e) recommended inspection method and procedure and alternatives; f) minimum size of damage considered detectable by the method(s) of inspection; g) guidance to the operator on which inspection findings should be reported to the type
design organization; h) recommended initial inspection threshold; i) recommended repeat inspection interval; j) reference to any optional modification or replacement of part or component as
terminating action to inspection; k) reference to the mandatory modification or replacement of the part or component at given life if fail-safety by inspection is impractical; and l) information related to any variations found necessary to safe-lives already declared.
4.3.6.2  Corrosion prevention and control programme
4.3.6.2.1 This programme should contain recommendations for the definition of corrosion levels, inspection techniques, re-application of protective treatments and recording and reporting of findings.
4.3.6.2.2  A simple, unambiguous way of defining corrosion severity should be stated, for example:
a) Level 1. Corrosion damage occurring between successive inspections that: 1) is local and can be re-worked within structural repair manual limits;
2)  can be attributed to an event not typical of operator usage of other aircraft in the same fleet (e.g. mercury spill); or
3)  had been blended out several times and the result of the latest inspection now exceeds the allowable limits requiring a repair or partial replacement of a primary structural member.
b)  Level 2. Corrosion damage occurring between successive inspections that requires re-work exceeding the structural repair manual limits or that requires a repair or partial replacement of a primary structural member, but is not of immediate airworthiness concern.
c) Level 3. Corrosion damage of immediate airworthiness concern requiring expeditious action.
Note.— When Level 3 corrosion is found, consideration should be given to actions required on other aeroplanes in the operator’s fleet. The State of Registry should ensure that details of corrosion findings and proposed actions are expeditiously reported to the State of Design.
4.3.6.2.3  The action to be taken upon finding corrosion of the different levels should be clearly specified.
4.3.6.2.4 The inspections should be specified in areas of the aircraft rather than specific components.
4.3.6.2.5 The required access and cleaning required prior to inspection should be stated.
4.3.6.2.6 The circumstances in which inspection methods other than visual are required should be clearly defined.
　
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