IATA Aircraft Lease Guidance

Annex VI: Modifications Guidelines
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Aircraft, Engine, or APU S/N, as applicable
Engineering documentation and/or Manufacturer’s SB reference where appropriate
Terminated, Open, Not Applicable, Repetitive, or Partial Embodiment status
If repetitive then the threshold/interval should be stated
Date, Hours, and/or Cycles of embodiment or last maintenance accomplishment
Details of any deviations applied, including references, intervals, and applicability
Details of any de-modification. In which context the removal of a modification does not mean that the
aircraft has been completely restored to the original configuration, as some parts / wiring / brackets /
structural changes may remain. These remaining modification provisions may require separate evaluation
and approval by an appropriately approved design organization
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In addition to the summary sheets, a file should be provided which contains the approved data and the
compliance records:
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Document reference (including document revision number)
Effectivity, e.g. manufacturer’s S/N or description/P/N/item reference of component affected
Approval statement, e.g. EASA.21J.XXX/FAA/STC reference
Note: European modifications approved before September 2003 may not include an approval
statement. Modifications approved or validated before the establishment of the EASA are deemed to
be ‘Grandfathered’. For these modifications a reference document is required
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Description of the modification
Any applicable instructions for Continuing Airworthiness or limitations
Any referenced documentation
Classification of the modification, i.e. major or minor
Mass and balance impact if applicable
Electrical load analysis, if applicable
Any exemptions or deviations, if applicable
For STCs a ‘right to use’ letter is required
Modification reference, paragraph, and revision or reference document number
Aircraft details
Material used, e.g. batch number (if available) / S/N
Date of accomplishment
Signature and authorization number of the certifying staff
Maintenance organization or repair station number of the facility accomplishing the work
Certificate release to service
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