A standard modification kit, or just "mod kit", is a pre-defined selection of parts put together to perform a modification on an aircraft as specified in a Airbus Standard Service Bulletin.
The Airbus Standard Service Bulletin informs you about aircraft modification. It is an airworthiness approved document created to implement a change to the type design of, or an inspection to, a delivered aircraft either to maintain its level of safety, or to improve its operation.
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