Maintenance Significant Item (MSI) – Under MSG-3, items identified by the design approval holder whose failure could cause one of the following effects:
(1) It could affect safety on the ground or in flight,
(2) It could be undetectable during operations,
(3) It could have a significant impact on operations, or
(4) It could have a significant economic impact.
(5) In terms of development of maintenance and inspection instructions, MSIs include systems, subsystems, modules, components, accessories, units, and parts.
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